摘要:
//接口声明一些方法interface Car{public void run();public void stop();}//Benzclass Benz implements Car{public void run(){System.out.println("Benz Start...");}public void stop(){System.out.println("Benz Stop...");}}//Fordclass Ford implements Car{public void run(){System.out.println(" 阅读全文
摘要:
一个类内部产生一个实例,节省内存空间,数据库连接,关闭中用到比较多class Single{//私有构造方法在外部不能被调用//只能在Single类内部实例化一个对象,然后调用private Single(){}private staticfinal Single sl=new Single();public static Single getSingleInstance(){return sl;}public void Say(){System.out.println("I can Speak");}}public class SingletonDemo{public s 阅读全文