java atm模拟 atm机模拟系统java

import java.util.Scanner;
public class k29 {
	public static void main(String[] args){
		Scanner in=new Scanner(System.in);
		System.out.println("\t模拟自动取款机系统");
		System.out.println("==============================");
		int cardid=123456789,pwd=123456;
		double price=5000,ck=0,qk=0,zz=0;
		int cardid2=987654321;
		double price2=1000;
		System.out.println("请插卡（录入卡号）");
		int id=in.nextInt();
		if(cardid==id){
			System.out.println("请输入密码：");
			int pwd2=in.nextInt();
			if(pwd==pwd2){
				System.out.println("1.存款|2.取款|3.查询余额|4.转账|5.修改密码|6.退卡");
				System.out.println("请输入操作编号：");
				int n=in.nextInt();
				switch(n){
				case 1:
					System.out.println("请输入存款金额：");
					ck=in.nextDouble();
					price=price+ck;
					System.out.println("存款成功！现在的余额为："+price);
					break;
				case 2:
					System.out.println("请输入取款金额：");
					qk=in.nextDouble();
					if(qk<+price){
						price=price-qk;
					System.out.println("请取走"+qk+"元，现在余额为："+price);
					}
					else{
						System.out.println("取款金额过大，余额不足！");
					}
					break;
				case 3:
					System.out.println("您当前卡内余额为："+price);
					break;
				case 4:
					System.out.println("请输入对方的卡号：");
					int userid=in.nextInt();
					if(userid==cardid2){
						System.out.println("请输入转账金额：");
						zz=in.nextDouble();
						if(zz<=price){
							price=price-zz;
							price2=price2+zz;
							System.out.println("转账成功！您当前余额为："+price);
						}
						else{
							System.out.println("转账失败，余额不足！");
						}
					}
					else{
			            System.out.println("卡号错误！");
		                }
					break;
				case 5:	
					System.out.println("请输入原始密码：");
					int pwd3=in.nextInt();
					if(pwd3==pwd){
						System.out.println("请输入新密码：");	
						pwd=in.nextInt();
						System.out.println("密码修改成功！");	
					}
					else{
						System.out.println("原始密码有误，无法修改！");	
					}
					break;
				case 6:
			    	System.out.println("***请取卡***");
			    	System.out.println("谢谢使用本系统进行自助取款");
			    	return;
			    	default:
			    		System.out.println("操作号录入有误，请重新输入！");	
				}		
			}
			else{
					System.out.println("密码有误！");	
				}
		}

		}	

}