java新手笔记22 接口示例2

1.USB

package com.yfs.javase;

public interface USB {
	//定义规范
    public void read();
    public void write();
}

 2.UDisk读写

package com.yfs.javase;

public class UDisk implements USB {

	@Override
	public void read() {
		System.out.println("从U盘读取数据...");
		
	}

	@Override
	public void write() {
		System.out.println("向U盘写入数据...");
		
	}

}

 3.只读

package com.yfs.javase;

public class OnlyRead implements USB {

	@Override
	public void read() {
		System.out.println("读取数据...");
		
	}
    //空实现
	@Override
	public void write() {
		//return;
		
	}

}

 4.Mp3读写

package com.yfs.javase;

public class Mp3 implements USB {

	@Override
	public void read() {
		System.out.println("从Mp3读取数据...");
		
	}

	@Override
	public void write() {
		System.out.println("向Mp3写入数据...");
		
	}

}

 5.Computer

package com.yfs.javase;

public class Computer {
	
	private USB usb;
	//添加usb设备
	public void addUsb(USB u) {
		usb = u;
		u.read();
		u.write();
	}
	//删除usb设备
	public void deleteUsb() {
		if(usb != null) {
			usb = null;
			System.out.println("设备已删除...");
		}  else {
			System.out.println("没有usb设备...");
		}
	}

}

 6.测试

package com.yfs.javase;

public class Test {

	public static void main(String[] args) {
		Computer pc = new Computer();
		pc.deleteUsb();
		
		pc.addUsb(new Mp3());
		pc.deleteUsb();
		
		pc.addUsb(new UDisk());
		pc.deleteUsb();
		

	}

}

 7.内部类

package com.yfs.javase;

public class OutClass {
	private int a = 10;
	
	private void privateMethod() {
		
	}
	public void method1() {
		System.out.println("call method1()...");
		//创建内部类对象
		InnerClass inn = new InnerClass();
		inn.iMethod1();
	}
	
	public void method2() {
		System.out.println("call method2() ....");
	}
	 
	//内部类  为外部类提供服务
	class InnerClass {
		public void iMethod1() {
			System.out.println("inner method()");
			//外部类的属性方法 当自己的使用
			method2();
			System.out.println("a = " + a );
			privateMethod();
		}
	}

}

 8.方法中声明类

package com.yfs.javase;

public class OutMethodClass {
	
	public void method() {
		//方法中声明类  只能在方法中使用
		class Inner {
			public void innMe() {
				System.out.println("call InnMe()...");
			}
		}
		
		Inner inn =  new Inner();
		inn.innMe();
		
	}

	public void method2() {
		//Inner inn = new Inner();
	}
}

 9.测试内部类

package com.yfs.javase;

public class Test1 {

	public static void main(String[] args) {
		OutClass out = new OutClass();
        out.method1();
        //InnerClass inn = new InnerClass();
	}

}

 10.letter模板

package com.yfs.javase;
//信模板
public abstract class Templater {
	
	public abstract String toName() ;
	public abstract String fromName();
	public abstract String getContent();
	
	public void show() {
		System.out.println("尊敬的" + toName());
		System.out.println("\t您好！");
		System.out.println("\t\t" + getContent());
		System.out.println("\t\t\t 此致 \n\t\t\t\t 敬礼" );
		System.out.println("\t\t\t\t" + fromName());
		System.out.println("\t\t\t\t  2015.7.25" );
	}

}

 11.模板测试( 匿名类)

package com.yfs.javase.letter;

import com.yfs.javase.Person;

public class LetterTest {

	public static void main(String[] args) {
		
　　　　 Person p1 = new Person("张三");
        p1.speak();
        // 匿名类
        new Person("李四").speak();
        //创建对象 实现抽象方法  匿名类
        new Templater() {

			@Override
			public String toName() {
				return "领导";
			}

			@Override
			public String fromName() {
				return "员工";
			}

			@Override
			public String getContent() {
				return "涨点工资吧...";
			}
        	
        }.show();
	}

}