/修改密碼 public double xiugai(long zh4,String mima4) { for (int i = 0; i < accountList.length; i++) { Account account = accountList[i]; if(zh4==account.getId()){ if(mima4.equals(account.getPassword())){ System.out.println("登錄成功！?。?); System.out.println("請輸入新的密碼"); String newMima=sc.next(); if(mima4.replace(mima4, newMima) != null){ System.out.println("請再次確認密碼"); String newMima1=sc.next(); if(newMima1==newMima){ System.out.println("密碼修改成功"); break; }else{ System.out.println("密碼有誤"); } } } } } return 0; }