更新 rc/main/java/Singleton.java

rc/main/java/Singleton.java

@@ -1,16 +1,23 @@
-package cn.edu.zust.dubbo;
+public class SingletonPattern {
+    // 单例模式实现示例
+    private static SingletonPattern instance;
     
-public class Singleton {
+    private SingletonPattern() {}  // 私有构造函数
-    private int number =2025;
+    
-    public void setNumber(int number){
+    public static SingletonPattern getInstance() {
-        this.number=number;
+        if (instance == null) {
+            instance = new SingletonPattern();
+        }
+        return instance;
     }
-    public int getNumber(){
+    
-        return number;
+    public void showMessage() {
+        System.out.println("Singleton Pattern Demo");
     }
-    private static Singleton instance =new Singleton();
+    
-    private Singleton(){}
+    // 程序入口
-    public  static  Singleton getInstance(){
+    public static void main(String[] args) {
-        return  instance;
+        SingletonPattern singleton = SingletonPattern.getInstance();
+        singleton.showMessage();
     }
 }