用ｊａｖａ编写一个程序用到接口,能用到接口概念的就行

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解决时间 2021-11-24 15:21

提问者网友：川水往事
2021-11-23 21:33

最佳答案

五星知识达人网友：廢物販賣機
2021-11-23 21:56

代码如下：

public class Test {
public static void main(String[] args) throws Exception{
Lamp lamp = new Lamp(new RedBulb());
lamp.on();
lamp.setB(new GreenBulb());
lamp.on();
}
}
class Lamp{
private Bulb b;
public Lamp(Bulb b){
this.b = b;
}
public void on(){
b.light();
}
public void setB(Bulb b){
this.b = b;
}
}
interface Bulb{
void light();
}
class RedBulb implements Bulb{
@Override
public void light() {
System.out.println("Red light.");
}
}
class GreenBulb implements Bulb{
@Override
public void light() {
System.out.println("Green light.");
}
}

全部回答

1楼网友：一把行者刀
2021-11-23 23:24

interface Eat {
void eat();
}

class Cat implements Eat {

public Cat(String name) {
this.name = name;
}

private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Override
public void eat() {
System.out.println("Cat is eating.");
}

}

class Dog implements Eat {

public Dog(String name) {
this.name = name;
}

private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Override
public void eat() {
System.out.println("Dog is eating.");
}

}

public class Main{

public static void main(String args[]) {

Eat dog, cat;
dog = new Dog("A");
cat = new Cat("B");
dog.eat();
cat.eat();

}

}
/// 保存成Main.java

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