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(" 您好！");
System.out.println(" " + getContent());
System.out.println(" 此致
敬礼" );
System.out.println(" " + fromName());
System.out.println(" 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();
}
}