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31 lines
444 B
31 lines
444 B
public class Jb30_Interface2
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{
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//实现电脑USB接口功能
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public static void main(String[] args)
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{
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useUSB(new Upan());
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}
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public static void useUSB(USB u) //接口类型的引用，用于接收（指向）接口的子类对象
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{
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u.open();
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u.close();
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}
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}
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interface USB
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{
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public void open();
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public void close();
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}
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class Upan implements USB
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{
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public void open()
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{
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System.out.println("开启");
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}
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public void close()
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{
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System.out.println("关闭");
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}
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} |