Question

我正在学习如何编码，我面临一些问题，我希望有人可以帮助我。目前，我正在创建一个提示军事状态并显示适当折扣的程序，但如果答案不是给定选项之一，我希望它循环。

这是我的代码：

    public static void main(String[] args)
  {
    char milID = ' ';
    char status = ' '; 

    String validMilitaryID = JOptionPane.showInputDialog("Do you have a valid military ID?");
    milID = validMilitaryID.charAt(0);

    Scanner valid = new Scanner(System.in);


    if (milID == 'Y') {
      System.out.printf("%n Are you Active Duty, Retired, or a Dependant?");
        status = valid.nextLine().charAt(0);
    } else if (milID == 'y'){
      System.out.printf("%n Are you Active Duty, Retired, or a Dependant?");
        status = valid.nextLine().charAt(0);
    }else{
      JOptionPane.showMessageDialog(null, "Sorry, you are currently ineligible for a Military Discount");
      System.exit(0);
    }


    if (status == 'A'){
      JOptionPane.showMessageDialog(null, "Congratulations! You are eligible to recieve a 15% discount!");
    } else if (status == 'R'){
      JOptionPane.showMessageDialog(null, "Congratulations! You are eligible to recieve a 13% discount!");
    }else if ( status == 'D'){
      JOptionPane.showMessageDialog(null, "Congratulations! You are eligible to recieve a 10% discount!");
    } else {
      JOptionPane.showMessageDialog(null, "Sorry! That was not a valid answer.");
    }




   System.exit(0);
  }//END MAIN

如果有人能够提供帮助，您能解释一下这个过程吗？由于我是Java新手，我想学习而不仅仅是修复。谢谢！！

Answer 1

1）您可以将输入以及if代码调用到while循环中

2）如果

，可以使用开关而不是if..else

来自逻辑的东西，例如：

boolean checkInput = true;
while (checkInput) {
  // now get your input... not coded

  switch (milId) {
    case "y","Y": bla bla, break;
    case "x","X": bla bla, break;
    otherwise: bla bla, break;
}}

3）为您的帐户值使用变量;你可以用查找来编码这个

Answer 2

您的代码中缺少Java（或一般编程）的组成部分，那就是＆＃34; while循环＆＃34;。我不知道你到目前为止对Java有多少了解，但是一个while循环会重复其代码块中的内容，直到满足要求为止。如果您在添加错误输入的情况下添加重复调查的功能，则在条件开头的while循环就是您所需要的。

<强>伪代码

create variable called correctAnswer
Do you have a military id? Enter y or Y if yes, any other key for no
if yes, correctAnswer = 1
if no, correctAnswer = 0 and while loop is skipped 

while correctAnswer = 1
{
   Are you active, retired, etc?
   If yes, what is your status?

   if A, R, or D is given, display congrats message. correctAnswer = 0 //end 

   if anything other than A, R or D is given, then correctAnswer = 1 //repeat 
}

第二个条件块中的while循环不断重复循环，直到给出正确的答案。

如何使用不正确的输入循环java

2 个答案: