第十五章上机练习4

package cn.第十五章上级题;

import java.util.Scanner;

public class Shangjilianxi4 {
	double qian;
	String []goods=new String []{"电风扇","洗衣机","电视机","冰箱","空调机"};
	double[]price=new double[]{124.23,4500,8800.90,5000.88,4456,12000.46};
	public boolean login(){
		boolean flag=false;
		Scanner input=new Scanner(System.in);
		System.out.println("请输入用户名");
		String name=input.next();
		System.out.println("请输入密码");
		String pass=input.next();
		if(name.equals("TOM")&&pass.equals("123")){
			System.out.println("登录成功!");
			show();
			flag=true;
		}else {
			System.out.println("登录失败!");
			
		}
		
		return flag;
	}
	public void show(){
		System.out.println("**********欢迎进入商品批发城******");
		System.out.println("编号\t商品\t价格\t");
		for (int i = 0; i < goods.length; i++) {
			System.out.print("\n"+(i+1));
			System.out.print("\t"+goods[i]);
			System.out.print("\t"+change(price[i]));
		}
		
	}
	public StringBuffer change(double d){
		StringBuffer str=new StringBuffer(String.valueOf(d));
		for(int i=str.indexOf(".")-3;i>0;i=i-3){
			str.insert(i,',');
		}
		return str;
	}
public static void main(String[] args) {
	double[]price=new double[]{124.23,4500,8800.90,5000.88,4456,12000.46};
	Scanner input=new Scanner(System.in);
	Shangjilianxi4 a=new Shangjilianxi4();
	a.login();
	System.out.print("\n请输入您批发是商品编号:");
	int bh=input.nextInt();
	System.out.print("请输入批发数量:");
	int shu=input.nextInt();
	/*switch(bh){
	case 1:
	    a.qian=	124.23*shu;
	break;
	case 2:
		a.qian=4500*shu;
		break;
	case 3:
		a.qian=8800.90*shu;
		break;
	case 4:
		a.qian=5000.88*shu;
		break;
	case 5:
		a.qian=4456*shu;
		break;
	
	}*/
	double zong=price[bh-1]*shu;
	StringBuffer q=a.change(zong);
	System.out.println("你需要付款:"+a.change(zong));
}
}