盖房子的图纸:单例设计模式,大概率面试题
class Singleton
{
private static final Singleton INSTANCE = new Singleton() ;
private Singleton() {} //构造方法私有化
public static Singleton getInstance() {
return INSTANCE ;
}
public void print() {
System.out.println("Hello World !") ;
}
}
public class TestDemo
{
public static void main(String args[]) {
Singleton s = Singleton.getInstance() ;
s.print() ;
}
}