十四章上机练习四

import java.util.*;
public class Goods {
    String[] goods=new String[]{"电风扇","洗衣机","电视机","冰箱","空调机"};
    double[] price=new double[]{124.23,4500,8800.90,5000.88,4456,1200.46};
   
    double total;
    public boolean login(){
    	boolean flag=false;
    	Scanner input=new Scanner(System.in);
    	System.out.print("请输入用户名: ");
    	String name=input.next();
    	System.out.print("请输入密码: ");
    	String pwd=input.next();
    	if(name.equals("Tom")&&pwd.equals("123")){
    		System.out.println("登录成功");
    		flag=true;
    	}else{
    		System.out.println("请重新登录");
    		
    	}
    	return flag;
    }
     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 void show(){
    	Scanner input=new Scanner(System.in);
    	System.out.println("*********欢迎进入商品批发城*********");
    	System.out.println("\t编号\t商品\t价格");
    	for(int i=0;i