增加未选择难度时的处理

# Conflicts:
#	data/users.txt

.idea/artifacts/TestSystem_jar.xml

@@ -0,0 +1,15 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="TestSystem:jar">
+    <output-path>$PROJECT_DIR$/out/artifacts/TestSystem_jar</output-path>
+    <root id="archive" name="TestSystem.jar">
+      <element id="directory" name="META-INF">
+        <element id="file-copy" path="$PROJECT_DIR$/META-INF/MANIFEST.MF" />
+      </element>
+      <element id="module-output" name="TestSystem" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/net/objecthunter/exp4j/0.4.8/exp4j-0.4.8.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/com/sun/mail/jakarta.mail/2.0.1/jakarta.mail-2.0.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/com/formdev/flatlaf/3.4.1/flatlaf-3.4.1.jar" path-in-jar="/" />
+      <element id="extracted-dir" path="$MAVEN_REPOSITORY$/com/sun/activation/jakarta.activation/2.0.1/jakarta.activation-2.0.1.jar" path-in-jar="/" />
+    </root>
+  </artifact>
+</component>

.idea/compiler.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="TestSystem" />
+      </profile>
+    </annotationProcessing>
+    <bytecodeTargetLevel>
+      <module name="TestSystem" target="22" />
+    </bytecodeTargetLevel>
+  </component>
+</project>

.idea/jarRepositories.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>

.idea/libraries/Maven__com_formdev_flatlaf_3_4_1.xml

@@ -0,0 +1,14 @@
+<component name="libraryTable">
+  <library name="Maven: com.formdev:flatlaf:3.4.1" type="java-imported" external-system-id="Maven">
+    <properties groupId="com.formdev" artifactId="flatlaf" version="3.4.1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/formdev/flatlaf/3.4.1/flatlaf-3.4.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/formdev/flatlaf/3.4.1/flatlaf-3.4.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/formdev/flatlaf/3.4.1/flatlaf-3.4.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Maven__com_sun_activation_jakarta_activation_2_0_1.xml

@@ -0,0 +1,14 @@
+<component name="libraryTable">
+  <library name="Maven: com.sun.activation:jakarta.activation:2.0.1" type="java-imported" external-system-id="Maven">
+    <properties groupId="com.sun.activation" artifactId="jakarta.activation" version="2.0.1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/activation/jakarta.activation/2.0.1/jakarta.activation-2.0.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/activation/jakarta.activation/2.0.1/jakarta.activation-2.0.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/activation/jakarta.activation/2.0.1/jakarta.activation-2.0.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Maven__com_sun_mail_jakarta_mail_2_0_1.xml

@@ -0,0 +1,14 @@
+<component name="libraryTable">
+  <library name="Maven: com.sun.mail:jakarta.mail:2.0.1" type="java-imported" external-system-id="Maven">
+    <properties groupId="com.sun.mail" artifactId="jakarta.mail" version="2.0.1" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/mail/jakarta.mail/2.0.1/jakarta.mail-2.0.1.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/mail/jakarta.mail/2.0.1/jakarta.mail-2.0.1-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/com/sun/mail/jakarta.mail/2.0.1/jakarta.mail-2.0.1-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/libraries/Maven__net_objecthunter_exp4j_0_4_8.xml

@@ -0,0 +1,14 @@
+<component name="libraryTable">
+  <library name="Maven: net.objecthunter:exp4j:0.4.8" type="java-imported" external-system-id="Maven">
+    <properties groupId="net.objecthunter" artifactId="exp4j" version="0.4.8" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/net/objecthunter/exp4j/0.4.8/exp4j-0.4.8.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/net/objecthunter/exp4j/0.4.8/exp4j-0.4.8-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/net/objecthunter/exp4j/0.4.8/exp4j-0.4.8-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/TestSystem.iml" filepath="$PROJECT_DIR$/TestSystem.iml" />
+    </modules>
+  </component>
+</project>

.idea/workspace.xml

@@ -0,0 +1,216 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ArtifactsWorkspaceSettings">
+    <artifacts-to-build>
+      <artifact name="TestSystem:jar" />
+    </artifacts-to-build>
+  </component>
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="1201acd7-f240-4a23-9c12-26bf9afcb8cb" name="更改" comment="修复除零bug">
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/target/classes/com/mathapp/problemGenerators/HighSchoolProblemGenerator.class" beforeDir="false" afterPath="$PROJECT_DIR$/target/classes/com/mathapp/problemGenerators/HighSchoolProblemGenerator.class" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="Git.Settings">
+    <favorite-branches>
+      <branch-storage>
+        <map>
+          <entry type="REMOTE">
+            <value>
+              <list>
+                <branch-info repo="$PROJECT_DIR$" source="origin/liwentao_branch" />
+              </list>
+            </value>
+          </entry>
+        </map>
+      </branch-storage>
+    </favorite-branches>
+    <option name="RECENT_BRANCH_BY_REPOSITORY">
+      <map>
+        <entry key="$PROJECT_DIR$" value="main" />
+      </map>
+    </option>
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="KubernetesApiPersistence">{}</component>
+  <component name="KubernetesApiProvider">{
+  &quot;isMigrated&quot;: true
+}</component>
+  <component name="ProjectColorInfo">{
+  &quot;customColor&quot;: &quot;&quot;,
+  &quot;associatedIndex&quot;: 1
+}</component>
+  <component name="ProjectId" id="33pYNF2i3YjFfOgekWFVlM8sKGc" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;SHARE_PROJECT_CONFIGURATION_FILES&quot;: &quot;true&quot;,
+    &quot;git-widget-placeholder&quot;: &quot;liwentao__branch&quot;,
+    &quot;kotlin-language-version-configured&quot;: &quot;true&quot;,
+    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
+    &quot;node.js.detected.package.tslint&quot;: &quot;true&quot;,
+    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;,
+    &quot;node.js.selected.package.tslint&quot;: &quot;(autodetect)&quot;,
+    &quot;nodejs_package_manager_path&quot;: &quot;npm&quot;,
+    &quot;onboarding.tips.debug.path&quot;: &quot;C:/Users/Teptao/Desktop/软件工程导论/结对项目/TestSystem/src/main/java/org/example/Main.java&quot;,
+    &quot;project.structure.last.edited&quot;: &quot;工件&quot;,
+    &quot;project.structure.proportion&quot;: &quot;0.15&quot;,
+    &quot;project.structure.side.proportion&quot;: &quot;0.2&quot;,
+    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;,
+    &quot;应用程序.MathApp.executor&quot;: &quot;Run&quot;
+  }
+}</component>
+  <component name="RunManager">
+    <configuration name="MathApp" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="com.mathapp.MathApp" />
+      <module name="TestSystem" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="com.mathapp.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="应用程序.MathApp" />
+        <item itemvalue="应用程序.MathApp" />
+        <item itemvalue="应用程序.MathApp" />
+        <item itemvalue="应用程序.MathApp" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SharedIndexes">
+    <attachedChunks>
+      <set>
+        <option value="bundled-jdk-9f38398b9061-18abd8497189-intellij.indexing.shared.core-IU-241.14494.240" />
+        <option value="bundled-js-predefined-1d06a55b98c1-74d2a5396914-JavaScript-IU-241.14494.240" />
+      </set>
+    </attachedChunks>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="应用程序级" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="默认任务">
+      <changelist id="1201acd7-f240-4a23-9c12-26bf9afcb8cb" name="更改" comment="" />
+      <created>1760015440315</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1760015440315</updated>
+      <workItem from="1760015441432" duration="7635000" />
+    </task>
+    <task id="LOCAL-00001" summary="创建maven项目">
+      <option name="closed" value="true" />
+      <created>1760015899092</created>
+      <option name="number" value="00001" />
+      <option name="presentableId" value="LOCAL-00001" />
+      <option name="project" value="LOCAL" />
+      <updated>1760015899092</updated>
+    </task>
+    <task id="LOCAL-00002" summary="创建maven项目">
+      <option name="closed" value="true" />
+      <created>1760015989374</created>
+      <option name="number" value="00002" />
+      <option name="presentableId" value="LOCAL-00002" />
+      <option name="project" value="LOCAL" />
+      <updated>1760015989374</updated>
+    </task>
+    <task id="LOCAL-00003" summary="初步框架">
+      <option name="closed" value="true" />
+      <created>1760022602945</created>
+      <option name="number" value="00003" />
+      <option name="presentableId" value="LOCAL-00003" />
+      <option name="project" value="LOCAL" />
+      <updated>1760022602945</updated>
+    </task>
+    <task id="LOCAL-00004" summary="合并更改">
+      <option name="closed" value="true" />
+      <created>1760136750934</created>
+      <option name="number" value="00004" />
+      <option name="presentableId" value="LOCAL-00004" />
+      <option name="project" value="LOCAL" />
+      <updated>1760136750934</updated>
+    </task>
+    <task id="LOCAL-00005" summary="合并更改">
+      <option name="closed" value="true" />
+      <created>1760136867337</created>
+      <option name="number" value="00005" />
+      <option name="presentableId" value="LOCAL-00005" />
+      <option name="project" value="LOCAL" />
+      <updated>1760136867337</updated>
+    </task>
+    <task id="LOCAL-00006" summary="修复使用用户名登录时无法修改密码的问题">
+      <option name="closed" value="true" />
+      <created>1760182983400</created>
+      <option name="number" value="00006" />
+      <option name="presentableId" value="LOCAL-00006" />
+      <option name="project" value="LOCAL" />
+      <updated>1760182983400</updated>
+    </task>
+    <task id="LOCAL-00007" summary="修复除零bug">
+      <option name="closed" value="true" />
+      <created>1760183246928</created>
+      <option name="number" value="00007" />
+      <option name="presentableId" value="LOCAL-00007" />
+      <option name="project" value="LOCAL" />
+      <updated>1760183246928</updated>
+    </task>
+    <option name="localTasksCounter" value="8" />
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+  <component name="Vcs.Log.Tabs.Properties">
+    <option name="TAB_STATES">
+      <map>
+        <entry key="MAIN">
+          <value>
+            <State>
+              <option name="FILTERS">
+                <map>
+                  <entry key="branch">
+                    <value>
+                      <list>
+                        <option value="liwentao_branch" />
+                      </list>
+                    </value>
+                  </entry>
+                </map>
+              </option>
+            </State>
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+  <component name="VcsManagerConfiguration">
+    <MESSAGE value="创建maven项目" />
+    <MESSAGE value="初步框架" />
+    <MESSAGE value="合并更改" />
+    <MESSAGE value="修复使用用户名登录时无法修改密码的问题" />
+    <MESSAGE value="修复除零bug" />
+    <option name="LAST_COMMIT_MESSAGE" value="修复除零bug" />
+  </component>
+</project>

README.md

@@ -0,0 +1,5 @@
+# TestSystem
+
+双击exe运行
+
+密码加密后保存在txt中

TestSystem.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="$MODULE_DIR$/pom.xml" external.system.module.type="SINGLE_MODULE" external.system.module.version="223-2" org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="AdditionalModuleElements">
+    <content url="file://$MODULE_DIR$" dumb="true">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+  </component>
+</module>

data/11/20251009_235440.txt

@@ -0,0 +1,104 @@
+用户: 11
+时间: 20251009_235440
+得分: 4 / 20
+====================================
+题目 1: 58 / 1^2 / 1 - 31 * 61
+选项: -183.3 | -1828.2 | -1833 | 1833
+你的答案: 1833
+正确答案: -1833
+--------------------
+题目 2: 78 * sqrt(9) - 14 / 14 + 21
+选项: -254 | 2540 | 254 | 25.4
+你的答案: 25.4
+正确答案: 254
+--------------------
+题目 3: 10 / 10^2
+选项: 0.1 | -0.44 | 1.87 | -0.1
+你的答案: 1.87
+正确答案: 0.1
+--------------------
+题目 4: 51 * 74 / 1 + 2^2 * 38
+选项: -3926 | 3927.72 | 39260 | 3926
+你的答案: 39260
+正确答案: 3926
+--------------------
+题目 5: 43 + 88 / sqrt(16) / 1
+选项: 650 | -65 | 65 | 62.89
+你的答案: 65
+正确答案: 65
+--------------------
+题目 6: 2 * 48^2
+选项: 4604.6 | 4608 | -4608 | 46080
+你的答案: -4608
+正确答案: 4608
+--------------------
+题目 7: sqrt(81) * 61 - 56 / 28 + 70
+选项: 613.97 | 617 | 619.92 | 6170
+你的答案: 6170
+正确答案: 617
+--------------------
+题目 8: 73 / sqrt(64)
+选项: 0.91 | 7.36 | 91.3 | 9.13
+你的答案: 91.3
+正确答案: 9.13
+--------------------
+题目 9: 29 * 44 + 44^2 / 22 - 45
+选项: -1319 | 13190 | 131.9 | 1319
+你的答案: 131.9
+正确答案: 1319
+--------------------
+题目 10: 53 * sqrt(49) - 91
+选项: 281.97 | -280 | 280 | 2800
+你的答案: 280
+正确答案: 280
+--------------------
+题目 11: 39 - 7 + 85^2
+选项: -7257 | 7257 | 7259.54 | 725.7
+你的答案: 7259.54
+正确答案: 7257
+--------------------
+题目 12: sqrt(9) + 80
+选项: 83 | 81.76 | 84.08 | -83
+你的答案: 84.08
+正确答案: 83
+--------------------
+题目 13: 71 - 48 / 16 / 8^2 * 23
+选项: 69.92 | 74.21 | -69.92 | 66.37
+你的答案: -69.92
+正确答案: 69.92
+--------------------
+题目 14: 67 + sqrt(100) / 4 * 35
+选项: -154.5 | 1545 | 157.75 | 154.5
+你的答案: 157.75
+正确答案: 154.5
+--------------------
+题目 15: sqrt(81) * 1 + 69
+选项: -78 | 780 | 7.8 | 78
+你的答案: 7.8
+正确答案: 78
+--------------------
+题目 16: 14 / 7 * 82 - sqrt(9)
+选项: 1610 | 160.16 | 161 | -161
+你的答案: 161
+正确答案: 161
+--------------------
+题目 17: 92 + 3 + 53^2
+选项: 290.4 | 2904 | 29040 | 2899.46
+你的答案: 29040
+正确答案: 2904
+--------------------
+题目 18: 20 - 87 * 71^2
+选项: -438547 | -438548.67 | 438547 | -4385470
+你的答案: 438547
+正确答案: -438547
+--------------------
+题目 19: 40^2 * 35
+选项: 56000 | 55995.78 | 560000 | 56002.59
+你的答案: 560000
+正确答案: 56000
+--------------------
+题目 20: 59 * 93 + 51^2 / 17 * 12
+选项: 73230 | 732.3 | 7323 | -7323
+你的答案: 7323
+正确答案: 7323
+--------------------

data/11/20251010_001044.txt

@@ -0,0 +1,54 @@
+用户: 11
+时间: 20251010_001044
+得分: 3 / 10
+====================================
+题目 1: 7 + 35 * (75^2) + tan(pi/4)
+选项: -196883 | 196887.67 | 196883 | 196878.95
+你的答案: 196887.67
+正确答案: 196883
+--------------------
+题目 2: sqrt(49) + 19 + 38 + 46 - 73 - tan(0)
+选项: 37 | 35.09 | 3.7 | 34.85
+你的答案: 34.85
+正确答案: 37
+--------------------
+题目 3: sqrt(25) * 25 * 27 - 38 - sin(pi/6)
+选项: -3336.5 | 3335.81 | 333.65 | 3336.5
+你的答案: 333.65
+正确答案: 3336.5
+--------------------
+题目 4: sqrt(100) / 83 / sin(pi/6)
+选项: -0.24 | 0.02 | 3.98 | 0.24
+你的答案: 3.98
+正确答案: 0.24
+--------------------
+题目 5: 23 / 1 - 77 * sqrt(81) * 66 - tan(pi/6)
+选项: -45712.35 | -4571.56 | -45715.58 | 45715.58
+你的答案: -45715.58
+正确答案: -45715.58
+--------------------
+题目 6: sqrt(36) - 67 + 2 / 2 / cos(0)
+选项: -600 | -55.76 | -60 | 60
+你的答案: -55.76
+正确答案: -60
+--------------------
+题目 7: 13 - sqrt(81) * tan(pi/6)
+选项: 78 | 7.8 | 11.8 | 3.35
+你的答案: 11.8
+正确答案: 7.8
+--------------------
+题目 8: 27 + 62 * 35 + (30^2) - 32 - cos(pi/3)
+选项: -3064.5 | 3068.06 | 3066.31 | 3064.5
+你的答案: 3064.5
+正确答案: 3064.5
+--------------------
+题目 9: 72 + 18 / sqrt(49) / sin(pi/3)
+选项: 7.5 | 73.65 | 74.97 | -74.97
+你的答案: 74.97
+正确答案: 74.97
+--------------------
+题目 10: (9^2) / 9 * 19 - sin(pi/3)
+选项: 170.13 | 17.01 | -170.13 | 168.56
+你的答案: -170.13
+正确答案: 170.13
+--------------------

data/111/20251009_230103.txt

@@ -0,0 +1,54 @@
+用户: 111
+时间: 20251009_230103
+得分: 1 / 10
+====================================
+题目 1: 65 * 26 * 74
+选项: 125060 | -125060 | 125061.54 | 125055.85
+你的答案: 125060
+正确答案: 125060
+--------------------
+题目 2: 46 * 27 + (59 - 13)
+选项: 12880 | 1291.39 | 1288 | -1288
+你的答案: 1291.39
+正确答案: 1288
+--------------------
+题目 3: 53 - 10 / 2 + 30
+选项: 80.19 | 81.77 | 78 | -78
+你的答案: -78
+正确答案: 78
+--------------------
+题目 4: 63 * 57 + 68 + (65 + 23)
+选项: 3747 | -3747 | 374.7 | 3748.92
+你的答案: 3748.92
+正确答案: 3747
+--------------------
+题目 5: 86 * 9 / 3
+选项: -258 | 258 | 259.78 | 253.48
+你的答案: 253.48
+正确答案: 258
+--------------------
+题目 6: (29 - 28) / 2
+选项: 0.5 | 0.05 | -1.27 | -0.5
+你的答案: -1.27
+正确答案: 0.5
+--------------------
+题目 7: 76 - (57 + 64)
+选项: 45 | -450 | -48.52 | -45
+你的答案: -48.52
+正确答案: -45
+--------------------
+题目 8: 94 + 49 - 43 * 89
+选项: -3684 | -368.4 | -3683.93 | -3686.38
+你的答案: -3683.93
+正确答案: -3684
+--------------------
+题目 9: 7 + 16 + 45 + 100 / 1
+选项: 168 | -168 | 1680 | 171.5
+你的答案: 1680
+正确答案: 168
+--------------------
+题目 10: 80 * 29 + (89 + 22)
+选项: -2431 | 243.1 | 24310 | 2431
+你的答案: 24310
+正确答案: 2431
+--------------------

data/111/20251009_230130.txt

@@ -0,0 +1,54 @@
+用户: 111
+时间: 20251009_230130
+得分: 2 / 10
+====================================
+题目 1: 7 + 58 * 25 + 60
+选项: 1517 | -1517 | 15170 | 1517.09
+你的答案: 15170
+正确答案: 1517
+--------------------
+题目 2: 96 + 45 * 90 * 67
+选项: 271446.92 | 271441.78 | -271446 | 271446
+你的答案: 271446
+正确答案: 271446
+--------------------
+题目 3: 86 - 48 * 22 + 28
+选项: -94.2 | -938.29 | -942 | 942
+你的答案: 942
+正确答案: -942
+--------------------
+题目 4: (92 + 9) / 3
+选项: -33.67 | 3.37 | 33.67 | 36.24
+你的答案: 36.24
+正确答案: 33.67
+--------------------
+题目 5: 78 - 56
+选项: 2.2 | 23.24 | 22 | 19.03
+你的答案: 19.03
+正确答案: 22
+--------------------
+题目 6: 36 * 33 - 2
+选项: 118.6 | -1186 | 11860 | 1186
+你的答案: 11860
+正确答案: 1186
+--------------------
+题目 7: 8 - 4 * 67 * 15
+选项: -4012 | -401.2 | -4012.5 | 4012
+你的答案: -4012.5
+正确答案: -4012
+--------------------
+题目 8: 63 / 1 - 1 - 1 * 89
+选项: -27 | -24.27 | -2.7 | -31.81
+你的答案: -2.7
+正确答案: -27
+--------------------
+题目 9: (61 - 39) + 75 + 59
+选项: 15.6 | 1560 | 156 | 154.47
+你的答案: 156
+正确答案: 156
+--------------------
+题目 10: 48 * 15 * 100 + 64 * 52
+选项: 75328 | 75327.06 | 753280 | -75328
+你的答案: 753280
+正确答案: 75328
+--------------------

data/111/20251009_230514.txt

@@ -0,0 +1,54 @@
+用户: 111
+时间: 20251009_230514
+得分: 2 / 10
+====================================
+题目 1: 73^2 + 89
+选项: -5418 | 5420.87 | 5418.24 | 5418
+你的答案: 5418.24
+正确答案: 5418
+--------------------
+题目 2: 46 - sqrt(36)
+选项: 400 | -40 | 4 | 40
+你的答案: 40
+正确答案: 40
+--------------------
+题目 3: 9 + 21 / 1^2
+选项: 3 | 33.46 | 30 | 300
+你的答案: 3
+正确答案: 30
+--------------------
+题目 4: 34 * 87^2 + 87
+选项: 25743.3 | 257430.61 | 257433 | 2574330
+你的答案: 257433
+正确答案: 257433
+--------------------
+题目 5: 7 / 1^2
+选项: 7.57 | 7 | 0.7 | -7
+你的答案: 0.7
+正确答案: 7
+--------------------
+题目 6: 92 * (19^2 + 74)
+选项: 40022.97 | 40022.78 | 400200 | 40020
+你的答案: 40022.97
+正确答案: 40020
+--------------------
+题目 7: 99^2 + 59 / 1
+选项: 986 | 9856.24 | -9860 | 9860
+你的答案: 986
+正确答案: 9860
+--------------------
+题目 8: sqrt(25) + 1 + 13
+选项: -19 | 190 | 19 | 1.9
+你的答案: 190
+正确答案: 19
+--------------------
+题目 9: 26 + sqrt(64)
+选项: -34 | 3.4 | 340 | 34
+你的答案: 340
+正确答案: 34
+--------------------
+题目 10: 44 / sqrt(25)
+选项: 0.88 | 8.8 | 8.46 | -8.8
+你的答案: 8.46
+正确答案: 8.8
+--------------------

data/111/20251009_234734.txt

@@ -0,0 +1,54 @@
+用户: 111
+时间: 20251009_234734
+得分: 2 / 10
+====================================
+题目 1: 95 + 48^2 * 7 + 96 * 36
+选项: 196790 | -19679 | 19679 | 19683.08
+你的答案: 19679
+正确答案: 19679
+--------------------
+题目 2: 66 * 58 + 67 * sqrt(9)
+选项: 40290 | 4029 | 4032.33 | 4031.06
+你的答案: 4031.06
+正确答案: 4029
+--------------------
+题目 3: 96 / 24 + 87 / 87^2
+选项: -4.01 | 7.73 | 6.58 | 4.01
+你的答案: 6.58
+正确答案: 4.01
+--------------------
+题目 4: sqrt(9) - 96
+选项: -930 | 93 | -9.3 | -93
+你的答案: -9.3
+正确答案: -93
+--------------------
+题目 5: 30 + 98 + 81^2 + 86 / 43
+选项: 6687.47 | 669.1 | 6695.88 | 6691
+你的答案: 6695.88
+正确答案: 6691
+--------------------
+题目 6: sqrt(25) * 4
+选项: 20 | 200 | 2 | -20
+你的答案: 200
+正确答案: 20
+--------------------
+题目 7: 17^2 * 7
+选项: 2018.58 | 2022.15 | 2024.75 | 2023
+你的答案: 2024.75
+正确答案: 2023
+--------------------
+题目 8: 65 / 13 / 1 * 13^2 * 38
+选项: 321100 | 3211 | 32114.95 | 32110
+你的答案: 32114.95
+正确答案: 32110
+--------------------
+题目 9: 56 / 1 + sqrt(64) - 5
+选项: 58.53 | -59 | 59 | 5.9
+你的答案: 58.53
+正确答案: 59
+--------------------
+题目 10: 93 / sqrt(16) + 19
+选项: 40.06 | 47.16 | 42.25 | -42.25
+你的答案: 42.25
+正确答案: 42.25
+--------------------

data/111/20251010_002008.txt

@@ -0,0 +1,54 @@
+用户: 111
+时间: 20251010_002008
+得分: 3 / 10
+====================================
+题目 1: 9 * 28 - 36 + sqrt(25) * 85 + tan(pi/4)
+选项: 646.48 | 641.16 | 642 | 64.2
+你的答案: 64.2
+正确答案: 642
+--------------------
+题目 2: (91^2) / 1 * cos(pi/4)
+选项: 5857.24 | 5855.55 | 5852.13 | 585.56
+你的答案: 585.56
+正确答案: 5855.55
+--------------------
+题目 3: sqrt(25) * 15 - 19 + 56 - 35 / sin(pi/6)
+选项: 42 | 43.2 | 420 | 40.73
+你的答案: 420
+正确答案: 42
+--------------------
+题目 4: 47 * 25 * sqrt(100) / 1 + cos(pi/6)
+选项: 11746.83 | 11751.94 | 11750.87 | 1175.09
+你的答案: 1175.09
+正确答案: 11750.87
+--------------------
+题目 5: 16 + 33 / sqrt(64) * cos(pi/4)
+选项: -18.92 | 1.89 | 189.2 | 18.92
+你的答案: 189.2
+正确答案: 18.92
+--------------------
+题目 6: 68 + 15 - sqrt(25) + 13 * 3 - sin(pi/6)
+选项: 1165 | 116.5 | 11.65 | -116.5
+你的答案: 11.65
+正确答案: 116.5
+--------------------
+题目 7: 31 / 1 / 1 / sqrt(25) * 57 - sin(pi/6)
+选项: 35.29 | 348.77 | 352.9 | -352.9
+你的答案: 352.9
+正确答案: 352.9
+--------------------
+题目 8: 77 + 90 - (45^2) - 60 * cos(pi/3)
+选项: -1883.16 | -1892.42 | -1888 | -1889.63
+你的答案: -1888
+正确答案: -1888
+--------------------
+题目 9: 26 / sqrt(4) + cos(pi/6)
+选项: 1.39 | 138.7 | 13.87 | 10.03
+你的答案: 13.87
+正确答案: 13.87
+--------------------
+题目 10: 70 - 66 * 53 + (18^2) - 33 * tan(pi/6)
+选项: -312.31 | -3123.05 | -31230.5 | 3123.05
+你的答案: -31230.5
+正确答案: -3123.05
+--------------------

data/aaa/20251009_224716.txt

@@ -0,0 +1,54 @@
+用户: aaa
+时间: 20251009_224716
+得分: 4 / 10
+====================================
+题目 1: 60 * 11
+选项: 660.85 | 6600 | 660 | 659.63
+你的答案: 660
+正确答案: 660
+--------------------
+题目 2: (20 + 66) + 84
+选项: 173.87 | 17 | 169.57 | 170
+你的答案: 170
+正确答案: 170
+--------------------
+题目 3: 57 - 31 - 30
+选项: 4 | -4 | -8.19 | -40
+你的答案: -40
+正确答案: -4
+--------------------
+题目 4: 68 * 54 / 3 / 3
+选项: -408 | 408 | 4080 | 407.67
+你的答案: 408
+正确答案: 408
+--------------------
+题目 5: 60 / 6 / 1
+选项: 10 | -10 | 6.77 | 100
+你的答案: 6.77
+正确答案: 10
+--------------------
+题目 6: 7 * 97
+选项: 6790 | 679 | -679 | 678.45
+你的答案: -679
+正确答案: 679
+--------------------
+题目 7: 15 / 5 / 5
+选项: 0.06 | 0.6 | 5.48 | -0.6
+你的答案: -0.6
+正确答案: 0.6
+--------------------
+题目 8: 74 + (74 - 26) * 44 / 22
+选项: -170 | 165.28 | 17 | 170
+你的答案: 170
+正确答案: 170
+--------------------
+题目 9: 27 + 92 + (21 - 14) * 91
+选项: 756 | 753.22 | 756.82 | -756
+你的答案: 753.22
+正确答案: 756
+--------------------
+题目 10: 77 * 45 * 69 / 1
+选项: -239085 | 239082.47 | 2390850 | 239085
+你的答案: -239085
+正确答案: 239085
+--------------------

data/teptao/20251010_092503.txt

@@ -0,0 +1,54 @@
+用户: teptao
+时间: 20251010_092503
+得分: 3 / 10
+====================================
+题目 1: sqrt(16) + 34 + 77 / tan(pi/3)
+选项: 82.46 | 824.6 | 8.25 | -82.46
+你的答案: 82.46
+正确答案: 82.46
+--------------------
+题目 2: 35 * 30 / sqrt(4) + cos(pi/6)
+选项: 529.63 | 525.87 | 520.88 | 524.58
+你的答案: 525.87
+正确答案: 525.87
+--------------------
+题目 3: 35 - 93 / 1 * (89^2) * 15 / tan(pi/4)
+选项: -11049760 | 11049760 | -1104976 | -11049757.51
+你的答案: -1104976
+正确答案: -11049760
+--------------------
+题目 4: (16^2) * 75 / cos(0)
+选项: -19200 | 192000 | 19204.12 | 19200
+你的答案: 19204.12
+正确答案: 19200
+--------------------
+题目 5: 19 * 90 - sqrt(36) * tan(pi/6)
+选项: 1706.54 | 1701.81 | 17065.4 | -1706.54
+你的答案: 17065.4
+正确答案: 1706.54
+--------------------
+题目 6: 37 + 86 + sqrt(4) + sin(pi/6)
+选项: 1255 | 125.5 | 124.64 | -125.5
+你的答案: -125.5
+正确答案: 125.5
+--------------------
+题目 7: 88 - sqrt(36) / 23 * 19 + 87 / cos(pi/6)
+选项: -183.5 | 182.06 | 186.56 | 183.5
+你的答案: 186.56
+正确答案: 183.5
+--------------------
+题目 8: 57 - sqrt(49) - cos(pi/4)
+选项: 4.93 | 46.5 | 44.99 | 49.29
+你的答案: 44.99
+正确答案: 49.29
+--------------------
+题目 9: 68 + 83 / 1 + 68 / sqrt(9) + tan(pi/6)
+选项: 1742.4 | 17.42 | -174.24 | 174.24
+你的答案: -174.24
+正确答案: 174.24
+--------------------
+题目 10: 59 - sqrt(100) - 58 + tan(0)
+选项: -0.9 | -90 | -9 | 9
+你的答案: -9
+正确答案: -9
+--------------------

data/users.txt

@@ -1,4 +1,4 @@
-teptao::7RcqFZEiXA1x7ggr5Sy2xvdMuJb6Xz/P8aMMmj+PZbI=
+test@example.com::jZae727K08KaOmKSgOaGzww/XVqLqBG7KAbpTTJzaI0=
-张三1::pmWkWSBCL51Bfkhn79xPuKBKHz//H6B+mY6G9/eieuM=
+Tester::Tester::7RcqFZEiXA1x7ggr5Sy2xvdMuJb6Xz/P8aMMmj+PZbI=
-teptao::pmWkWSBCL51Bfkhn79xPuKBKHz//H6B+mY6G9/eieuM=
+
-teptao::pmWkWSBCL51Bfkhn79xPuKBKHz//H6B+mY6G9/eieuM=
+Tester2::1414246561@qq.com::7RcqFZEiXA1x7ggr5Sy2xvdMuJb6Xz/P8aMMmj+PZbI=

src/main/java/com/mathapp/MathApp.java

@@ -25,6 +25,11 @@ public class MathApp extends JFrame {
   public static final String RESULTS_PANEL = "ResultsPanel";
   public static final String CHANGE_PASSWORD_PANEL = "ChangePasswordPanel";
 
+  private LoginPanel loginPanel;
+  private RegisterPanel registerPanel;
+  private MainMenuPanel mainMenuPanel;
+  private ChangePasswordPanel changePasswordPanel;
+
   public MathApp() {
     initUI();
   }
@@ -39,11 +44,16 @@ public class MathApp extends JFrame {
     cardLayout = new CardLayout();
     mainPanel = new JPanel(cardLayout);
 
+    loginPanel = new LoginPanel(this);
+    registerPanel = new RegisterPanel(this);
+    mainMenuPanel = new MainMenuPanel(this);
+    changePasswordPanel = new ChangePasswordPanel(this);
+
     // 添加所有静态面板
-    mainPanel.add(new LoginPanel(this), LOGIN_PANEL);
+    mainPanel.add(loginPanel, LOGIN_PANEL);
-    mainPanel.add(new RegisterPanel(this), REGISTER_PANEL);
+    mainPanel.add(registerPanel, REGISTER_PANEL);
-    mainPanel.add(new MainMenuPanel(this), MAIN_MENU_PANEL);
+    mainPanel.add(mainMenuPanel, MAIN_MENU_PANEL);
-    mainPanel.add(new ChangePasswordPanel(this), CHANGE_PASSWORD_PANEL);
+    mainPanel.add(changePasswordPanel, CHANGE_PASSWORD_PANEL);
 
     add(mainPanel);
   }
@@ -53,6 +63,23 @@ public class MathApp extends JFrame {
    * @param panelName 要显示的面板名称
    */
   public void showPanel(String panelName) {
+    switch (panelName) {
+      case LOGIN_PANEL:
+        loginPanel.resetPanel();
+        break;
+      case REGISTER_PANEL:
+        registerPanel.resetPanel();
+        break;
+      case MAIN_MENU_PANEL :
+        mainMenuPanel.resetPanel();
+        break;
+      case CHANGE_PASSWORD_PANEL :
+        changePasswordPanel.resetPanel();
+        break;
+      default:
+        break;
+    }
+
     cardLayout.show(mainPanel, panelName);
   }
 

src/main/java/com/mathapp/models/User.java

@@ -6,21 +6,28 @@ import java.util.Base64;
 import java.util.Random;
 
 public class User {
+  private final String username;
   private final String email;
   private final String hashedPassword;
 
   // 构造函数1：用于新用户注册，需要原始密码
-  public User(String email, String rawPassword) {
+  public User(String username, String email, String rawPassword) {
+    this.username = username;
     this.email = email;
     this.hashedPassword = hashPassword(rawPassword);
   }
 
   // 构造函数2：用于从文件加载用户，已是哈希密码
-  public User(String email, String hashedPassword, boolean isHashed) {
+  public User(String username, String email, String hashedPassword, boolean isHashed) {
+    this.username = username;
     this.email = email;
     this.hashedPassword = hashedPassword;
   }
 
+  public String getUsername() {
+    return username;
+  }
+
   public String getEmail() {
     return email;
   }

src/main/java/com/mathapp/panels/ChangePasswordPanel.java

@@ -82,6 +82,12 @@ public class ChangePasswordPanel extends JPanel {
     backButton.addActionListener(e -> app.showPanel(MathApp.MAIN_MENU_PANEL));
   }
 
+  public void resetPanel() {
+    oldPasswordField.setText("");
+    newPasswordField.setText("");
+    confirmNewPasswordField.setText("");
+  }
+
   private void handleChangePassword() {
     String email = app.getCurrentUserEmail();
     if (email == null) {

src/main/java/com/mathapp/panels/LoginPanel.java

@@ -6,6 +6,8 @@ import com.mathapp.services.DataPersistence;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
 
 public class LoginPanel extends JPanel {
   private final MathApp app;
@@ -23,6 +25,52 @@ public class LoginPanel extends JPanel {
     emailField = new JTextField(20);
     passwordField = new JPasswordField(20);
 
+    emailField.setText("请输入账号（支持邮箱或用户名）");
+    emailField.setForeground(Color.GRAY);
+
+    passwordField.setText("........");
+    passwordField.setForeground(Color.GRAY);
+
+
+    emailField.addFocusListener(new FocusListener() {
+      public void focusGained(FocusEvent e) {
+        // 获得焦点时，若当前文本是提示文字，则清空并改为黑色
+        if (emailField.getText().equals("请输入账号（支持邮箱或用户名）")) {
+          emailField.setText("");
+          emailField.setForeground(Color.black);
+        }
+      }
+
+      public void focusLost(FocusEvent e) {
+        // 失去焦点时，若文本框为空，则恢复灰色提示文字
+        if (emailField.getText().isEmpty()) {
+          emailField.setForeground(Color.gray);
+          emailField.setText("请输入账号（支持邮箱或用户名）");
+        }
+      }
+    });
+
+
+    passwordField.addFocusListener(new FocusListener() {
+      public void focusGained(FocusEvent e) {
+        // 获得焦点时，若当前文本是提示文字，则清空并改为黑色
+        if (passwordField.getText().equals("........")) {
+          passwordField.setText("");
+          passwordField.setForeground(Color.black);
+        }
+      }
+
+      public void focusLost(FocusEvent e) {
+        // 失去焦点时，若文本框为空，则恢复灰色提示文字
+        if (passwordField.getText().isEmpty()) {
+          passwordField.setForeground(Color.gray);
+          passwordField.setText("........");
+        }
+      }
+    });
+
+
+
     JButton loginButton = new JButton("登录");
     loginButton.setFont(new Font("微软雅黑", Font.PLAIN, 16));
     loginButton.setPreferredSize(new Dimension(120, 40));
@@ -45,7 +93,7 @@ public class LoginPanel extends JPanel {
     gbc.gridwidth = 1;
     gbc.gridy = 1;
     gbc.anchor = GridBagConstraints.EAST;
-    add(new JLabel("邮箱:"), gbc);
+    //add(new JLabel("账号（用户名或邮箱）:"), gbc);
 
     gbc.gridx = 1;
     gbc.anchor = GridBagConstraints.WEST;
@@ -54,7 +102,7 @@ public class LoginPanel extends JPanel {
     gbc.gridx = 0;
     gbc.gridy = 2;
     gbc.anchor = GridBagConstraints.EAST;
-    add(new JLabel("密码:"), gbc);
+    //add(new JLabel("密码:"), gbc);
 
     gbc.gridx = 1;
     gbc.anchor = GridBagConstraints.WEST;
@@ -73,12 +121,17 @@ public class LoginPanel extends JPanel {
     registerButton.addActionListener(e -> app.showPanel(MathApp.REGISTER_PANEL));
   }
 
+  public void resetPanel() {
+    emailField.setText("");
+    passwordField.setText("");
+  }
+
   private void handleLogin() {
     String email = emailField.getText().trim();
     String password = new String(passwordField.getPassword());
 
     if (email.isEmpty() || password.isEmpty()) {
-      JOptionPane.showMessageDialog(this, "邮箱和密码不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
+      JOptionPane.showMessageDialog(this, "账号和密码不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
       return;
     }
 
@@ -87,7 +140,7 @@ public class LoginPanel extends JPanel {
       app.setCurrentUserEmail(email);
       app.showPanel(MathApp.MAIN_MENU_PANEL);
     } else {
-      JOptionPane.showMessageDialog(this, "邮箱或密码错误！", "登录失败", JOptionPane.ERROR_MESSAGE);
+      JOptionPane.showMessageDialog(this, "账号或密码错误！", "登录失败", JOptionPane.ERROR_MESSAGE);
     }
   }
 }

src/main/java/com/mathapp/panels/MainMenuPanel.java

@@ -80,7 +80,21 @@ public class MainMenuPanel extends JPanel {
     changePasswordButton.addActionListener(e -> app.showPanel(MathApp.CHANGE_PASSWORD_PANEL));
   }
 
+  public void resetPanel() {
+    levelGroup.clearSelection();
+    questionCountField.setText("10");
+  }
+
   private void handleStart() {
+
+    ButtonModel selectedModel = levelGroup.getSelection();
+
+    // 关键检查：判断是否有按钮被选中
+    if (selectedModel == null) {
+      JOptionPane.showMessageDialog(this, "请先选择一个难度级别！", "选择错误", JOptionPane.WARNING_MESSAGE);
+      return; // 发现未选择后，直接退出方法，不执行后续逻辑
+    }
+
     String level = levelGroup.getSelection().getActionCommand();
     int count;
     try {

src/main/java/com/mathapp/panels/RegisterPanel.java

@@ -15,9 +15,12 @@ public class RegisterPanel extends JPanel {
   private final JTextField codeField;
   private final JButton getCodeButton;
   private String generatedCode;
+  private Timer cooldownTimer;
 
   public RegisterPanel(MathApp app) {
     this.app = app;
+    this.generatedCode = null;
+    this.cooldownTimer = null;
     setLayout(new GridBagLayout());
     GridBagConstraints gbc = new GridBagConstraints();
 
@@ -74,6 +77,20 @@ public class RegisterPanel extends JPanel {
     backButton.addActionListener(e -> app.showPanel(MathApp.LOGIN_PANEL));
   }
 
+  public void resetPanel() {
+    emailField.setText("");
+    codeField.setText("");
+
+    getCodeButton.setText("获取验证码");
+    getCodeButton.setEnabled(true);
+
+    generatedCode = null;
+    if (cooldownTimer != null) {
+      cooldownTimer.stop();
+      cooldownTimer = null;
+    }
+  }
+
   private void handleGetCode() {
     String email = emailField.getText().trim();
     if (!ValidationUtils.isValidEmail(email)) {
@@ -131,24 +148,28 @@ public class RegisterPanel extends JPanel {
       JOptionPane.showMessageDialog(this, "验证码错误！", "错误", JOptionPane.ERROR_MESSAGE);
       return;
     }
-
+    
     // 验证成功，跳转到设置密码页面
     app.showSetPasswordPanel(emailField.getText().trim());
   }
 
   private void startCooldownTimer() {
-    Timer timer = new Timer(1000, null);
+    if (cooldownTimer != null) {
+      cooldownTimer.stop();
+    }
+
+    cooldownTimer = new Timer(1000, null);
     final int[] countdown = {60};
-    timer.addActionListener(e -> {
+    cooldownTimer.addActionListener(e -> {
       countdown[0]--;
       if (countdown[0] >= 0) {
         getCodeButton.setText(countdown[0] + "秒后重试");
       } else {
-        timer.stop();
+        cooldownTimer.stop();
         getCodeButton.setText("获取验证码");
         getCodeButton.setEnabled(true);
       }
     });
-    timer.start();
+    cooldownTimer.start();
   }
 }

src/main/java/com/mathapp/panels/SetPasswordPanel.java

@@ -11,6 +11,7 @@ import java.awt.*;
 public class SetPasswordPanel extends JPanel {
   private final MathApp app;
   private final String email;
+  private final JTextField usernameField;
   private final JPasswordField passwordField;
   private final JPasswordField confirmPasswordField;
 
@@ -26,6 +27,7 @@ public class SetPasswordPanel extends JPanel {
     JLabel infoLabel = new JLabel("密码需6-10位，且包含大小写字母和数字", SwingConstants.CENTER);
     infoLabel.setFont(new Font("微软雅黑", Font.PLAIN, 12));
 
+    usernameField = new JTextField(20);
     passwordField = new JPasswordField(20);
     confirmPasswordField = new JPasswordField(20);
     JButton confirmButton = new JButton("完成注册");
@@ -43,13 +45,22 @@ public class SetPasswordPanel extends JPanel {
     gbc.gridwidth = 1;
     gbc.gridy = 2;
     gbc.anchor = GridBagConstraints.EAST;
+    add(new JLabel("用户名:"), gbc);
+
+    gbc.gridx = 1;
+    gbc.anchor = GridBagConstraints.WEST;
+    add(usernameField, gbc);
+
+    gbc.gridy = 3;
+    gbc.gridx = 0;
+    gbc.anchor = GridBagConstraints.EAST;
     add(new JLabel("输入密码:"), gbc);
 
     gbc.gridx = 1;
     gbc.anchor = GridBagConstraints.WEST;
     add(passwordField, gbc);
 
-    gbc.gridy = 3;
+    gbc.gridy = 4;
     gbc.gridx = 0;
     gbc.anchor = GridBagConstraints.EAST;
     add(new JLabel("确认密码:"), gbc);
@@ -58,7 +69,7 @@ public class SetPasswordPanel extends JPanel {
     gbc.anchor = GridBagConstraints.WEST;
     add(confirmPasswordField, gbc);
 
-    gbc.gridy = 4;
+    gbc.gridy = 5;
     gbc.gridx = 0;
     gbc.gridwidth = 2;
     gbc.anchor = GridBagConstraints.CENTER;
@@ -68,9 +79,20 @@ public class SetPasswordPanel extends JPanel {
   }
 
   private void handleSetPassword() {
+    String username = usernameField.getText().trim();
     String password = new String(passwordField.getPassword());
     String confirmPassword = new String(confirmPasswordField.getPassword());
 
+    if (username.isEmpty()) {
+      JOptionPane.showMessageDialog(this, "请输入用户名！", "错误", JOptionPane.ERROR_MESSAGE);
+      return;
+    }
+
+    if (DataPersistence.findUserByUsername(username) != null) {
+      JOptionPane.showMessageDialog(this, "该用户名已被使用！", "错误", JOptionPane.ERROR_MESSAGE);
+      return;
+    }
+
     if (!password.equals(confirmPassword)) {
       JOptionPane.showMessageDialog(this, "两次输入的密码不一致！", "错误", JOptionPane.ERROR_MESSAGE);
       return;
@@ -82,7 +104,7 @@ public class SetPasswordPanel extends JPanel {
     }
 
     // 创建用户并保存
-    User newUser = new User(email, password);
+    User newUser = new User(username, email, password);
     DataPersistence.saveUser(newUser);
 
     JOptionPane.showMessageDialog(this, "注册成功！现在您可以登录了。", "成功", JOptionPane.INFORMATION_MESSAGE);

src/main/java/com/mathapp/problemGenerators/HighSchoolProblemGenerator.java

@@ -42,7 +42,8 @@ public class HighSchoolProblemGenerator extends MiddleSchoolProblemGenerator {
 
       // 2c.【健壮性检查】检查这个新运算符是否会与三角函数的值构成除零错误
       boolean isTrigValueZero = (function.equals("sin") && angleInDegrees == 0) ||
-              (function.equals("tan") && angleInDegrees == 0);
+              (function.equals("tan") && angleInDegrees == 0)||
+              (function.equals("cos") && angleInDegrees == 90);
 
       // 如果新运算符是除法，且三角函数的值是0，则这是一个非法组合，必须重试
       if (connectingOperator == Operator.DIVIDE && isTrigValueZero) {

src/main/java/com/mathapp/services/DataPersistence.java

@@ -32,7 +32,8 @@ public class DataPersistence {
   }
 
   public static void saveUser(User user) {
-    String userData = user.getEmail() + "::" + user.getHashedPassword() + System.lineSeparator();
+    // 更新数据格式为：用户名::邮箱::密码哈希
+    String userData = user.getUsername() + "::" + user.getEmail() + "::" + user.getHashedPassword() + System.lineSeparator();
     try {
       Files.writeString(USER_FILE_PATH, userData, StandardCharsets.UTF_8, StandardOpenOption.CREATE, StandardOpenOption.APPEND);
     } catch (IOException e) {
@@ -42,11 +43,31 @@ public class DataPersistence {
 
   public static User findUserByEmail(String email) {
     try (Stream<String> lines = Files.lines(USER_FILE_PATH, StandardCharsets.UTF_8)) {
-      return lines.filter(line -> line.startsWith(email + "::"))
+      return lines.filter(line -> {
+        String[] parts = line.split("::");
+        return parts.length >= 3 && (parts[1].equals(email)||parts[0].equals(email));
+      })
               .map(line -> {
                 String[] parts = line.split("::");
-                // 构造函数会处理密码哈希
+                return new User(parts[0], parts[1], parts[2], true);
-                return new User(parts[0], parts[1], true);
+              })
+              .findFirst()
+              .orElse(null);
+    } catch (IOException e) {
+      e.printStackTrace();
+      return null;
+    }
+  }
+
+  public static User findUserByUsername(String username) {
+    try (Stream<String> lines = Files.lines(USER_FILE_PATH, StandardCharsets.UTF_8)) {
+      return lines.filter(line -> {
+        String[] parts = line.split("::");
+        return parts.length >= 3 && parts[0].equals(username);
+      })
+              .map(line -> {
+                String[] parts = line.split("::");
+                return new User(parts[0], parts[1], parts[2], true);
               })
               .findFirst()
               .orElse(null);
@@ -60,9 +81,10 @@ public class DataPersistence {
     try {
       List<String> lines = Files.readAllLines(USER_FILE_PATH, StandardCharsets.UTF_8);
       for (int i = 0; i < lines.size(); i++) {
-        if (lines.get(i).startsWith(email + "::")) {
+        String[] parts = lines.get(i).split("::");
-          User tempUser = new User(email, newPassword); // 用来生成新密码的哈希值
+        if (parts.length >= 3 && parts[1].equals(email) || parts[0].equals(email)) {
-          lines.set(i, email + "::" + tempUser.getHashedPassword());
+          User tempUser = new User(parts[0], email, newPassword); 
+          lines.set(i, parts[0] + "::" + email + "::" + tempUser.getHashedPassword());  
           Files.write(USER_FILE_PATH, lines, StandardCharsets.UTF_8);
           return true;
         }

src/main/java/com/mathapp/services/EmailService.java

@@ -10,10 +10,10 @@ public class EmailService {
   // !!! 重要提示 !!!
   // 请将以下信息替换为您自己的SMTP服务器信息和凭据
   // 对于Gmail, 您需要生成一个 "应用专用密码"
-  private static final String SMTP_HOST = "smtp.your-email-provider.com"; // 例如：smtp.gmail.com
+  private static final String SMTP_HOST = "smtp.qq.com"; // 例如：smtp.gmail.com
   private static final String SMTP_PORT = "587"; // 通常是 587 (TLS) 或 465 (SSL)
-  private static final String FROM_EMAIL = "your-email@example.com"; // 您的发件邮箱地址
+  private static final String FROM_EMAIL = "971817787@qq.com"; // 您的发件邮箱地址
-  private static final String PASSWORD = "your-app-password"; // 您的应用专用密码或邮箱密码
+  private static final String PASSWORD = "aqcwtvmqcghjbedf"; // 您的应用专用密码或邮箱密码
 
   public static void sendVerificationCode(String toEmail, String code) throws MessagingException {
     Properties props = new Properties();