java的单态实现

public class Singleton {
	
//唯一接口实例
	private static Singleton instanse;	
	
//单态，接口调用方式：Singleton xxx = Singleton.getInstance();
	public static Singleton getInstance(){
		
		if(instanse == null){
			try{
				instanse = new Singleton();
			}catch(java.lang.OutOfMemoryError err){
				System.out.println("创建对象时内存溢出" + "::" + err.getMessage());
			}
		}
		
		return instanse;
	}
	
	private Singleton(){
		this.value = 0;
	}
	
	private int value;
	
	public void ondo(int value){
		this.value = value;
		System.out.println(value);
	}
}

调用：

public static void main(String[] args) {
		Singleton ex = Singleton.getInstance();
		Singleton ex1 = Singleton.getInstance();
		ex.ondo(2);
		ex1.ondo(3);
		System.out.println(ex == ex1);

	}

结果：
2
3
true