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1. ÏÈдһ¸öSingletonµÄclass
package stone;
public class Singleton {
    private static Singleton instance;
    private Singleton() {}
    public static Singleton getInstance(){
        if(instance==null)
            instance= new Singleton();
        return instance;
    }
}
2. ÔÙдһ¸öTestSingletonµÄclass
package stone;
public class TestSingleton {
    public static void main(String[] args) {
        Singleton s1=Singleton.getInstance();
        Singleton s2=Singleton.getInstance();
        if(s1==s2)
            System.out.println("s1=s2");
        else
            System.out.println("s1<>s2");
    }
}
3. ÔËÐÐTestSingleton, ½á¹ûÈçÏÂ:
s1=s2
4. ²âÊÔµ¥Àýģʽ³É¹¦.


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