更改

.gitignore

@@ -0,0 +1,29 @@
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

@@ -0,0 +1,8 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

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

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

Computer.iml

@@ -5,7 +5,7 @@
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
-    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>

src/computer/com.java

@@ -6,34 +6,29 @@ import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.text.MessageFormat;
 import java.util.Arrays;
-
-public class a {
+public class com {
     public static void main(String[] args) {
         new JS();
     }
 }
-
 class JS extends JFrame implements ActionListener {
     private final StringBuilder sBuilder = new StringBuilder();
     JTextArea text = new JTextArea();
     double a, b;
     Double sum;
     String lastOperator = "=";
-
     public JS() {
         setBounds(100, 100, 400, 400);
         setTitle("计算器");
         JMenuBar menubar = new JMenuBar();
         this.setJMenuBar(menubar);
         this.setLayout(new BorderLayout());
-
         JPanel p1 = new JPanel();
         JPanel p2 = new JPanel();
         text.setPreferredSize(new Dimension(370, 60));
         p2.setLayout(new FlowLayout());
         p1.add(text);
         this.add(p1, BorderLayout.NORTH);
-
         p2.setLayout(new GridLayout(5, 4));
         JButton[] button = new JButton[20];
         button[0] = new JButton("C");
@@ -56,17 +51,14 @@ class JS extends JFrame implements ActionListener {
         button[17] = new JButton("0");
         button[18] = new JButton(".");
         button[19] = new JButton("=");
-
         Arrays.stream(button).forEach(p2::add);
         this.add(p2, BorderLayout.CENTER);
-
         for (JButton jButton : button) {
             jButton.addActionListener(this);
         }
         this.setVisible(true);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }
-
     public void actionPerformed(ActionEvent e) {
         String lab = e.getActionCommand();
 
@@ -93,7 +85,6 @@ class JS extends JFrame implements ActionListener {
             }
         }
     }
-
     private void calculate() {
         switch (lastOperator) {
             case "+":