标签：java编程思想   enum   interface   接口实现   implements   

Note.java 一个枚举类

package Lesson8Polymorphism.music;

public enum Note 
{
	MIDDLE_C, C_SHARP, B_FLAT;
}

music5.java

/**
* 书本:《Thinking In Java》
* 功能:接口
* 文件:Music.java
* 时间:2015年4月2日16:50:48
* 作者:cutter_point
*/
package Lesson9Interfaces.music5;

import java.util.Scanner;

import Lesson8Polymorphism.music.Note;
import static net.mindview.util.Print.*;

interface Instrument
{
	int VALUES = 5; 	//默认是static和final的
	void paly(Note n);	//这里不能对方法进行实现
	void adjust();
}

class Wind implements Instrument	//必须实现接口的所有方法
{

	@Override
	public void paly(Note n) 
	{
		print(this + ".play() " + n);
	}

	@Override
	public void adjust() 
	{
		print(this + ".adjust()");
	}
	
	public String toString()
	{
		return "Wind()";
	}

	
}

class Percussion implements Instrument
{

	@Override
	public void paly(Note n) 
	{
		print(this + ".play() " + n);
	}

	@Override
	public void adjust() 
	{
		print(this + ".adjust()");
	}
	
	public String toString()
	{
		return "Percussion()";
	}
	
}

class Stringed implements Instrument
{
	@Override
	public void paly(Note n) 
	{
		print(this + ".play() " + n);
	}

	@Override
	public void adjust() 
	{
		print(this + ".adjust()");
	}
	
	public String toString()
	{
		return "Stringed()";
	}
	
}

class Brass extends Wind
{
	public String toString()
	{
		return "Brass";
	}
}

class Woodwind extends Wind
{
	public String toString()
	{
		return "Woodwind";
	}
}

public class Music5 
{
	static void tune(Instrument i)
	{
		i.paly(Note.MIDDLE_C); 			//MIDDLE_C, C_SHARP, B_FLAT;
	}
	
	static void tuneAll(Instrument[] e)
	{
		//一个个取出来调用tune函数
		for(Instrument i : e)
		{
			tune(i);
		}
	}
	
	public static void main(String [] args)
	{
//		Scanner s = new Scanner(System.in);
//		System.out.println(s.next());
		
		
		Instrument[] orchestra = 
			{
				new Wind(),
				new Percussion(),
				new Stringed(),
				new Brass(),
				new Woodwind()
			};
		
		tuneAll(orchestra);
	}
}

Wind().play() MIDDLE_C  obj1
Percussion().play() MIDDLE_C  obj1
Stringed().play() MIDDLE_C  obj1
Brass.play() MIDDLE_C  obj1
Woodwind.play() MIDDLE_C  obj1

【ThinkingInJava】10、接口使用

标签：java编程思想   enum   interface   接口实现   implements   

原文地址：http://blog.csdn.net/cutter_point/article/details/45110333