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我現寫的：?import?java.util.Scanner;public?class?ATM?{

private?static?String?theName?=?"admin";

private?static?String?thePassword?=?"123456";

private?static?int?balance?=?10000;

public?static?void?getBalance(){

System.out.println("當前余額："?+?balance);

}

public?static?void?drawMoney(Scanner?sc){

int?money?=?0;

System.out.println("請輸入取款金額：");

money?=?sc.nextInt();

String?type?=?"";

if?(balance?>?0)?{

if?(balance?>=?money)?{

if?(money?<=?5000)?{

balance?=?balance?-?money;

type?=?"請在30秒內提取現金...\n剩余余32313133353236313431303231363533e78988e69d8331333337383963額："+balance;

}?else?if?(money?<=?0)?{

type?=?"金額錯誤";

}?else?{

type?=?"超出最大限制金額";

}

}?else?{

type?=?"超出最大余額";

}

}?else?{

type?=?"余額不足";

}

System.out.println(type);

}

public?static?void?bankMoney(Scanner?sc){

int?money?=?0;

System.out.println("請輸入存儲金額：");

money?=?sc.nextInt();

String?type?=?"";

if?(money?>?0)?{

balance?=?balance?+?money;

type?=?"存儲成功，現有余額："?+?balance;

}?else?{

type?=?"存儲金額不能為負";

}

System.out.println(type);

}

public?static?void?updatePass(Scanner?sc){

String?oldPass?=?"";

String?newPass1?=?"";

String?newPass2?=?"";

while(true){

System.out.println("請輸入原密碼：");

oldPass?=?sc.next();

if?(oldPass.equals(thePassword))?{

break;

}?else?{

System.out.println("密碼錯誤，請重新輸入");

}

}

while(true){

System.out.println("請輸入新密碼");

newPass1?=?sc.next();

System.out.println("再次輸入");

newPass2?=?sc.next();

if?(newPass1.equals(newPass2))?{

if?(!isSame(newPass1))?{

thePassword?=?newPass1;

System.out.println("修改成功");

break;

}?else?{

System.out.println("所有字符不能相同，重新輸入");

}

}?else?{

System.out.println("兩次輸入不一致，重新輸入");

}

}

}

public?static?boolean?isSame(String?string){

boolean?bool?=?false;

for?(int?i?=?0;?i?

char?char1?=?string.charAt(i);

for?(int?j?=?i?+?1;?j?

char?char2?=?string.charAt(j);

if?(char1?==?char2)?{

bool?=?true;

break;

}

}

}

return?bool;

}

public?static?void?main(String[]?args)?{

Scanner?sc?=?new?Scanner(System.in);

while(true){

String?name?=?"";

String?password?=?"";

System.out.println("請輸入賬號：");

name?=?sc.next();

System.out.println("請輸入密碼：");

password?=?sc.next();

if?(name.equals(theName)?&&?password.equals(thePassword))?{

break;

}?else?{

System.out.println("賬號或密碼錯誤，請重新輸入!");

}

}

while(true){

int?operate?=?0;

System.out.println("請選擇你要進行的操作：\n1、查詢?2、取款?3、存款?4、修改密碼?0、退出");

operate?=?sc.nextInt();

if?(0?==?operate)?{

System.out.println("謝謝使用！");

break;

}?else?if?(1?==?operate)?{

getBalance();

}?else?if?(2?==?operate)?{

drawMoney(sc);

}?else?if?(3?==?operate)?{

bankMoney(sc);

}?else?if?(4?==?operate)?{

updatePass(sc);

}

}

}

}

總結

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