進行while循環的正確方法是什么？ 我的方式不起作用

Question

下面是我的程序，我的第一個while陳述很好用，但是第二個是我遇到問題的地方。 哪里說

    enterAnother = JOptionPane.showInputDialog( " Do you want to produce more labels? Y or N " );
    while (enterAnother.equals("Y") || enterAnother.equals("y"))

下面是我的程序，我的第一個while陳述很好用，但是第二個是我遇到問題的地方。 哪里說

   enterAnother = JOptionPane.showInputDialog

（“您是否想產生更多標簽？是還是N”）;

問題是從哪里開始的，我要問的是問用戶您想產生更多的標簽嗎？ Y或N，如果它們將Y或y遮蓋起來，它將重復並使其更貼標簽。 為了做到這一點，我需要在while (enterAnother.equals("Y") || enterAnother.equals("y"))再進行一次while (count <= numBoxes)循環，謝謝您的幫助。 同樣，目前我的代碼沒有錯誤，但是當然，當我運行它時，一切都會大便。

     import javax.swing.JOptionPane; // Imports JOptionPane class.

public class MailOrderEMHPractice
{
   public static void main( String[] args )
   {
// Declare string variables
String title;
String firstName;
String lastName;
String streetAddress;
String city;
String state;
String zip;
int numBoxes;
int count = 1;
String enterAnother = "Y"; //INITILIZE the loop control variable

String value = JOptionPane.showInputDialog("Enter Number of Boxes: ");
    numBoxes = Integer.parseInt(value);

//get input values from user
 title = JOptionPane.showInputDialog
( "What is your title ex. (Ms. Mr. Dr.) " );

//get input values from user
firstName = JOptionPane.showInputDialog
( "Enter First Name: " );

//get input values from user
lastName = JOptionPane.showInputDialog
( "Enter Last Name: " );

//get input values from user
streetAddress = JOptionPane.showInputDialog
( "Enter Street Address: " );

//get input values from user
city = JOptionPane.showInputDialog
( "Enter City: " );

//get input values from user
state = JOptionPane.showInputDialog
( "Enter State: " );

//get input values from user
zip = JOptionPane.showInputDialog
( "Enter Zip Code: " );


while (count <= numBoxes)
{
    System.out.println( "Box" + count + "of" + numBoxes);
    System.out.println( title + firstName + lastName );
    System.out.println( streetAddress );
    System.out.println( city + state + zip );
    count = count + 1;
}
//get input values from user
enterAnother = JOptionPane.showInputDialog
( " Do you want to produce more labels? Y or N " );

 while (enterAnother.equals("Y") || enterAnother.equals("y"))
 {
        //get input values from user
         title = JOptionPane.showInputDialog
        ( "What is your title ex. (Ms. Mr. Dr.) " );

        //get input values from user
        firstName = JOptionPane.showInputDialog
        ( "Enter First Name: " );

        //get input values from user
        lastName = JOptionPane.showInputDialog
        ( "Enter Last Name: " );

        //get input values from user
        streetAddress = JOptionPane.showInputDialog
        ( "Enter Street Address: " );

        //get input values from user
        city = JOptionPane.showInputDialog
        ( "Enter City: " );

        //get input values from user
        state = JOptionPane.showInputDialog
        ( "Enter State: " );

        //get input values from user
        zip = JOptionPane.showInputDialog
        ( "Enter Zip Code: " );

        String numBoxesString;
        numBoxesString = JOptionPane.showInputDialog
         ( "Enter Number of Boxes: " );
        numBoxes = Integer.parseInt(numBoxesString);

        //get input values from user to stop or continue loop
        enterAnother = JOptionPane.showInputDialog
        ( " Do you want to produce more labels? Y or N " );

        while (count <= numBoxes)
                        {
                            System.out.println( "Box" + count + "of" + numBoxes);
                            System.out.println( title + firstName + lastName );
                            System.out.println( streetAddress );
                            System.out.println( city + state + zip );
                            count = count + 1;
                        }

}
    // End program.
             System.exit(0);
}

Answer 1

您需要在循環結束時再次詢問：

while (enterAnother...){

..

enterAnother = JOptionPane.showInputDialog(...)
}

否則，enterAnother將永遠不會改變。

Answer 2

我看到了。 您需要在執行while循環之前將“ count”變量設置回0，以便在循環底部再次打印出標簽。 您還可以考慮將有關以下內容的問題轉給用戶：在循環打印出他們剛剛放入的內容后，他們是否要打印更多內容。我注意到，就像流程問題一樣，您問用戶要多少盒首先在第一輪，然后在循環中，您問用戶最后有多少個盒子。 就像用戶一樣，這讓我感到困惑。 只是給您一個心理上的注意。

    // get input values from user to stop or continue loop
    enterAnother = JOptionPane
        .showInputDialog(" Do you want to produce more labels? Y or N ");
    count = 0; // <---- this is the code you need to put in to make it work
    while (count <= numBoxes)
    {
    System.out.println("Box" + count + "of"
        + numBoxes);
    System.out.println(title + firstName
        + lastName);
    System.out.println(streetAddress);
    System.out.println(city + state + zip);
    count = count + 1;
    }