1

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/UML实践作业.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.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 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/UML实践作业.iml" filepath="$PROJECT_DIR$/.idea/UML实践作业.iml" />
+      <module fileurl="file://$PROJECT_DIR$/_02/_02.iml" filepath="$PROJECT_DIR$/_02/_02.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>

_02/_02.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

_02/src/Calculator.java

@@ -0,0 +1,66 @@
+import java.util.Scanner;
+
+public class Calculator {
+    // 加法
+    public static double add(double num1, double num2) {
+        return num1 + num2;
+    }
+
+    // 减法
+    public static double subtract(double num1, double num2) {
+        return num1 - num2;
+    }
+
+    // 乘法
+    public static double multiply(double num1, double num2) {
+        return num1 * num2;
+    }
+
+    // 除法
+    public static double divide(double num1, double num2) {
+        if (num2 == 0) {
+            throw new IllegalArgumentException("除数不能为零");
+        }
+        return num1 / num2;
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("请输入第一个数字:");
+        double num1 = scanner.nextDouble();
+
+        System.out.println("请输入第二个数字:");
+        double num2 = scanner.nextDouble();
+
+        System.out.println("请选择操作 (+, -, *, /):");
+        String operator = scanner.next();
+
+        double result;
+        switch (operator) {
+            case "+":
+                result = add(num1, num2);
+                break;
+            case "-":
+                result = subtract(num1, num2);
+                break;
+            case "*":
+                result = multiply(num1, num2);
+                break;
+            case "/":
+                try {
+                    result = divide(num1, num2);
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    return;
+                }
+                break;
+            default:
+                System.out.println("无效的操作符");
+                return;
+        }
+
+        System.out.println("结果: " + num1 + " " + operator + " " + num2 + " = " + result);
+        scanner.close();
+    }
+}