生产代码片段

Main.java

-class Main {
-  public static void main(String[] args) {
-    System.out.println("Hello world!");
-  }
+import java.util.HashMap;
+
+public class Employee {
+    private String id;
+    private String name;
+    private int age;
+    private double salary;
+
+    public Employee(String id, String name, int age, double salary) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+        this.salary = salary;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public static void main(String[] args) {
+        HashMap<String, Employee> employeeMap = new HashMap<>();
+        Employee e1 = new Employee("001", "张三", 25, 5000);
+        Employee e2 = new Employee("002", "李四", 30, 6000);
+        Employee e3 = new Employee("003", "王五", 35, 7000);
+        Employee e4 = new Employee("001", "赵六", 40, 8000); // 工号重复
+        employeeMap.put(e1.getId(), e1);
+        employeeMap.put(e2.getId(), e2);
+        employeeMap.put(e3.getId(), e3);
+        if (!employeeMap.containsKey(e4.getId())) {
+            employeeMap.put(e4.getId(), e4);
+        } else {
+            System.out.println("工号为" + e4.getId() + "的员工已存在，不允许添加！");
+        }
+    }
 }
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