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
-public class Singleton {
+    private static SingletonPattern instance;
-    private int number =2025;
+    
-    public void setNumber(int number){
+    private SingletonPattern() {}  // 私有构造函数
-        this.number=number;
+    
-    }
+    public static SingletonPattern getInstance() {
-    public int getNumber(){
+        if (instance == null) {
-        return number;
+            instance = new SingletonPattern();
-    }
+        }
-    private static Singleton instance =new Singleton();
+        return instance;
-    private Singleton(){}
+    }
-    public  static  Singleton getInstance(){
+    
-        return  instance;
+    public void showMessage() {
-    }
+        System.out.println("Singleton Pattern Demo");
-}
+    }
+    
+    // 程序入口
+    public static void main(String[] args) {
+        SingletonPattern singleton = SingletonPattern.getInstance();
+        singleton.showMessage();
+    }
+}