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單例設計模式的實現代碼
package test;
public class Singleton {
/**
*
* @author Administrator/2012-3-1/上午09:07:06
*/
public static void main(String[] args) {
Singleton s1=Singleton.getInstance();
Singleton s2=Singleton.getInstance();
Singleton s3=Singleton.getInstance();
System.out.println("s1="+s1);
System.out.println("s2="+s2);
System.out.println("s3="+s3);
}
/*** SingletonHolder is loaded on the first execution of Singleton.getInstance()
* * or the first access to SingletonHolder.INSTANCE, not before.
* */
private static class SingletonHolder {
public static final Singleton INSTANCE = new Singleton();
}
//Private constructor prevents instantiation from other classes
private Singleton() {
}
public static Singleton getInstance() {
return SingletonHolder.INSTANCE;
}
}
最後更新：2017-04-02 22:16:29