Scanner s = new Scanner(System.in); System.out.println("請輸入用戶名:"); String username = s.next(); System.out.println("請輸入密碼:"); String password = s.next(); //判斷用戶名密碼是否正確 if("a".equals(username) && "1".equals(password)){ System.out.println("登錄成功"); }else{ System.out.println("登錄失敗"); } }