9.抽象类和接口

/*开发一个租车系统
车型以及每天的租金
	小车							客车
别克	途观	宝马	宾利		   12>	   20>	   32>
300	600	800	1500	   800	   1200	   1800
要求：客户选择车型，再输入天数，计算出租金？

思路：
一：发现类
车类（Vehicle）：父类
小车（Car）：子类
客车（Bus）：子类
二：发现属性和方法
车类属性：每天租金
车类的方法：计算租金（抽象方法）

小车属性：品牌
方法：重写父类计算租金方法，属性的get/set方法，在set或者get方法中完成品牌的判断从而得到每天的租金

客车属性：座位数
方法：同上

业务升级1：加入了新的车种，货车。货车是按吨数来计算日租金，每吨每天50块。把该功能加入到原有系统中
业务升级2：可以选择多次租车，最后完成总金额的计算
*/
package com.class1107;

import java.util.Scanner;

public class Class01 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner sc=new Scanner(System.in);
		int cr=0;
		int sum=0;
		do{
			System.out.println("请输入要租赁的车型：小车;客车;货车");
			String sign=sc.next();
			switch(sign){
			    case "小车":
			    	Car c=new Car();
			    	System.out.println("请输入要租赁的车型：别克;途观;宝马;宾利");
			    	c.setBrand(sc.next());
			    	System.out.println("请输入要租赁的天数");
			    	cr=c.countrent(sc.nextInt());
			        break;
			    case "客车":
			    	Bus b=new Bus();
					System.out.println("请输入要租赁的客车座位数");
					b.setSeat(sc.nextInt());
					System.out.println("请输入要租赁的天数");
			    	cr=b.countrent(sc.nextInt());
			    	break;
			    case "货车":
			    	Trucks t=new Trucks();
			    	System.out.println("请输入要租赁的客车吨位");
					t.setTon(sc.nextInt());
					System.out.println("请输入要租赁的天数");
			    	cr=t.countrent(sc.nextInt());
			    	break;
			    default:
			    	System.out.println("输入有误，请重新输入");
			    	break;
			}
			System.out.println("您本次租车的租金为："+cr+"元");
			sum+=cr;
			System.out.println("是否继续租车：y/n");
			if(sc.next().equals("n"))
			{
				break;
			}
		}while(true);
		System.out.println("您的总租金为："+sum+"元");
	}
}

abstract class Vehicle{
	int dayrent;
	public abstract int countrent(int day);
}

class Car extends Vehicle{
	private String brand;
	public void setBrand(String brand)
	{
		this.brand=brand;
		switch(brand){
		    case "别克":
		    	dayrent=300;
			    break;
		    case "途观":
		    	dayrent=600;
		    	break;
		    case "宝马":
		    	dayrent=800;
		    	break;
		    case "宾利":
		    	dayrent=1500;
		    	break;
		}
	}
	public String getBrand()
	{
		return brand;
	}
	@Override
	public int countrent(int day)
	{
		return day*dayrent;
	}
}

class Bus extends Vehicle{
	private int seat;
	public void setSeat(int seat)
	{
		this.seat=seat;
		if(seat>0&&seat<=12){
			dayrent=800;
		}else if(seat>12&&seat<=20){
			dayrent=1200;
		}else if(seat>20&&seat<=32){
			dayrent=1800;
		}
	}
	public int getSeat()
	{
		return seat;
	}
	@Override
	public int countrent(int day)
	{
		return day*dayrent;
	}
}

class Trucks extends Vehicle{
	private int ton;
	public void setTon(int ton){
		this.ton=ton;
		dayrent=ton*50;
	}
	public int getTon(){
		return ton;
	}
	public int countrent(int day)
	{
		return day*dayrent;
	}
}

package com.demo1107;
/**
 *	笔记本usb案例 
 */
public class USBDemo {
	public static void main(String[] args) {
		IUSB usb = new Disk();
		Computer c = new Computer(usb);
		c.start();
	}
}

class Computer{
	IUSB usb;
	public Computer(IUSB usb) {
		this.usb = usb;
	}
	public void start(){
		System.out.println("笔记本正在启动，启动完毕，准备调用usb接口功能");
		usb.work();
	}
}

interface IUSB{
	public void work();
}

class Disk implements IUSB{
	@Override
	public void work() {
		System.out.println("我是1Tb的移动硬盘，正在读取数据");
	}
}
class Feng implements IUSB{
	@Override
	public void work() {
		System.out.println("我是电风扇，正在吹吹风");
	}
}

package com.demo1107;
/**
 *	打印机案例 
 */
public class Printer {
	public static void main(String[] args) {
		IPaper p = new B5Paper();
		IBox b = new BlackBox();
		
		Print print = new Print(p, b);
		print.println("你好，海文");
	}
}

class Print{
	IPaper paper;
	IBox box;
	public Print(IPaper paper,IBox box) {
		this.paper = paper;
		this.box = box;
	}
	
	public void println(String content){
		paper.paper();
		box.box();
		System.out.println("正在打印："+content);
	}
}

interface IPaper{
	public void paper();
}

interface IBox{
	public void box(); 
}

class A4Paper implements IPaper{
	public void paper() {
		System.out.println("正在使用a4的纸张");
	}
}

class B5Paper implements IPaper{
	public void paper() {
		System.out.println("正在使用b5的纸张");
	}
}

class ColorBox implements IBox{
	public void box() {
		System.out.println("正在使用彩色的墨盒");
	}
}

class BlackBox implements IBox{
	public void box() {
		System.out.println("正在使用黑白的墨盒");
	}
}

package com.demo1107;

public class Demo2 {
	public static void main(String[] args) {
		IWasher w = new HaierWasher();//接口的类型指向实现类的对象
		System.out.println("品牌是："+w.brand);
		w.wash();
	}
}

interface IWasher{
	static final String brand ="海尔";
	
	public abstract void wash();
}

class HaierWasher implements IWasher{
	@Override
	public void wash() {
		System.out.println("洗衣服咯");
	}
	
}