面向接口编程的实际应用

例一：

• 第一代手机：打电话 发短信
• 第二代手机：拍照 听音乐
• 第三代手机：上网 播放视频
• 分析：将手机的功能定义成三个接口，定义手机的实体类，让实体类实现不同的接口，就表示该手机的功能有了迭代。

public interface FirstGeneration {
	public void call();			//打电话
	public void message();		//发短信
}

public interface SecondGeneration {
	public void photo();		//拍照
	public void playMusic();	//听音乐
}

public interface ThirdGeneration {
	public void playVideo();	//播放视频
	public void Internet();		//上网
}

public class Mobile implements FirstGeneration,SecondGeneration,ThirdGeneration{

	@Override
	public void call() {
		// TODO Auto-generated method stub
		System.out.println("打电话");
	}

	@Override
	public void message() {
		// TODO Auto-generated method stub
		System.out.println("发短信");
	}

	@Override
	public void photo() {
		// TODO Auto-generated method stub
		System.out.println("拍照");
	}

	@Override
	public void playMusic() {
		// TODO Auto-generated method stub
		System.out.println("听音乐");
	}

	@Override
	public void playVideo() {
		// TODO Auto-generated method stub
		System.out.println("播放视频");
	}

	@Override
	public void Internet() {
		// TODO Auto-generated method stub
		System.out.println("上网");
	}
	
}

public class Test {
	public static void main(String[] args) {
		Mobile mobile = new Mobile();
		mobile.call();
		mobile.message();
		mobile.photo();
		mobile.playMusic();
		mobile.playVideo();
		mobile.Internet();
	}
}

例二

组装电脑：
电脑的主要组成包括CPU，硬盘，内存，现在用程序模拟组装一台电脑的过程。

1. 定义CPU类，属性：price，speed
2. 定义HardDisk类，属性：price，size
3. 定义Memory类，属性：price，size
4. 定义Computer类，属性：CPU，HardDisk，Memory

public interface CPU {
	public void show();
}

public class CPUImpl implements CPU{
	private double price;
	private String speed;
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public String getSpeed() {
		return speed;
	}
	public void setSpeed(String speed) {
		this.speed = speed;
	}
	public CPUImpl(double price, String speed) {
		super();
		this.price = price;
		this.speed = speed;
	}
	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("CPU信息【价格："+this.price+",主频："+this.speed+"】");
	}
}

public class NewCPUImpl implements CPU{
	private double price;
	private String speed;
	private String thirdCache;
	public NewCPUImpl(double price, String speed, String thirdCache) {
		super();
		this.price = price;
		this.speed = speed;
		this.thirdCache = thirdCache;
	}
	public void show() {
		System.out.println("CPU信息【价格："+this.price+",主频："+this.speed+",三级缓存："+this.thirdCache+"】");
	}
}

public interface HardDisk {
	public void show();
}

public class HardDiskImpl implements HardDisk{
	private double price;
	private String size;
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public String getSize() {
		return size;
	}
	public void setSize(String size) {
		this.size = size;
	}
	public HardDiskImpl(double price, String size) {
		super();
		this.price = price;
		this.size = size;
	}
	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("硬盘信息【价格："+this.price+",容量："+this.size+"】");
	}
}

public interface Memory {
	public void show();
}

public class MemoryImpl implements Memory{
	private double price;
	private String size;
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public String getSize() {
		return size;
	}
	public void setSize(String size) {
		this.size = size;
	}
	public MemoryImpl(double price, String size) {
		super();
		this.price = price;
		this.size = size;
	}
	@Override
	public void show() {
		System.out.println("内存信息【价格："+this.price+",容量："+this.size+"】");
	}
}

public class Computer {
	private CPU cpu;
	private HardDisk hardDisk;
	private Memory memory;

	public CPU getCpu() {
		return cpu;
	}
	
	public void setCpu(CPU cpu) {
		this.cpu = cpu;
	}
	public HardDisk getHardDisk() {
		return hardDisk;
	}
	public void setHardDisk(HardDisk hardDisk) {
		this.hardDisk = hardDisk;
	}
	public Memory getMemory() {
		return memory;
	}
	public void setMemory(Memory memory) {
		this.memory = memory;
	}
	public Computer(CPU cpu, HardDisk hardDisk, Memory memory) {
		super();
		this.cpu = cpu;
		this.hardDisk = hardDisk;
		this.memory = memory;
	}
	public void show() {
		System.out.println("电脑配置如下：");
		this.cpu.show();
		this.hardDisk.show();
		this.memory.show();
	}
}

public class Test {
	public static void main(String[] args) {
		//创建零件
		CPU cpu = new CPUImpl(2600, "3.7GHz");
//		CPU cpu = new NewCPUImpl(3000, "3.7GHz", "12MB");
		HardDisk hardDisk = new HardDiskImpl(299,"1TB");
		Memory memory = new MemoryImpl(699, "8GB");
		//创建电脑，组装零件
		Computer computer = new Computer(cpu, hardDisk, memory);
		computer.show();
	}
}

---

返回上一层