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Thread: Java Do..while loop problem

  1. #1
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    Default Java Do..while loop problem

    I'm trying to put a do...while loop into this code
    import javax.swing.JOptionPane;
     
    public class UpperLowerCase2
    {
        public static void main(String[] args)
        {
            int choice;
            String someString,menu;
     
     
     
            menu = "Enter\n"
                 + "(1) Enter a string\n"
                 + "(2) Convert the string to all uppercase\n"
                 + "(3) Convert the String to all lowercase\n"
                 + "(4) Quit";
    do{
                 someString = JOptionPane.showInputDialog( menu );
     
                 choice = Integer.parseInt( someString );
     
     
                switch (choice)
     
                {
                    case 1: enterAString();
     
     
     
                    case 2: stringToUppercase();
     
     
                    case 3: convertStringLower();
     
     
                    case 4: System.out.println("Quit");
     
                }
     
    }while(choice!=4);
     
    }
    public static void enterAString()
    {
        String outputmessage,string;
        string = JOptionPane.showInputDialog("Enter Your String");
        outputmessage = "You entered " + string;
        JOptionPane.showMessageDialog( null, outputmessage );
     
    System.exit(0);
    }
     
    public static void stringToUppercase()
    {
        String outputMessage2,string2;
        string2 = JOptionPane.showInputDialog("Enter String to convert to UPPERCASE");
        string2 = string2.toUpperCase();
        outputMessage2 = " Here Ya Go " + string2;
        JOptionPane.showMessageDialog(null, outputMessage2);
        System.exit(0);
    }
     
    public static void convertStringLower()
    {
        String outputMessage3,string3;
        string3 = JOptionPane.showInputDialog("Enter String to convert to lowercase");
        string3 = string3.toLowerCase();
        outputMessage3 = "Here Ya Go " + string3;
        JOptionPane.showMessageDialog(null, outputMessage3);
        System.exit(0);
    }
     
    }

    However it isn't looping can somebody fix it for me or tell me what i need to do. The program runs, but it dosen't loop. Help Pleez


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Java Do..while loop problem

    What does it do instead? What do you think those System.exit() calls do?

  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: Java Do..while loop problem

    Please use [highlight=Java] code [/highlight] tags when posting your code.
    Forum Tip: Add to peoples reputation by clicking the button on their useful posts.

    Looking for a Java job? Visit - Java Programming Careers

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    Super Moderator helloworld922's Avatar
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    Default Re: Java Do..while loop problem

    You're forgetting to use breaks inside your switch statement.

    See: The switch Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)

  5. #5
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    Default Re: Java Do..while loop problem

    System.exit(0) terminates your program whether u are in a loop or not.

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