按以下要求编写程序( ) 编写USB接口,接口中声明open( ), close( )方法( ) 定义Keyboard类和Mouse类实现Animal接口( ) 编写Keyboard类和Mouse类的测试程序,并调用其中的open( )方法解答:Public interface USB { public abstract void open( ); // 打开设备 public abstract void close( ); // 关闭设备}Public class Keyboard implements USB { @Override public void open( ) { System.out.println( ); } @Override public void close( ) { System.out.println( ); }}Public class Mouse implements USB { @Override public void open( ) { System.out.println( ); } @Override public void close( ) { System.out.println( ); } }Public class TestMain { public static void main(String] args) { // 首先创建一个笔记本电脑 USB k = new Keyboard( ); k.open( ); USB m = new Mouse( ); m.open( );}
发布时间:2024-05-15 09:48:55