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Thread: Too long of a number for GUI

  1. #1
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    Default Too long of a number for GUI

    I'm working on an RSA cryptosystem, and I want to use a GUI to publish a person's public key.

    I have no problem displaying ints / strings via the GUI, but my problem is that the person's public key has an integer that's like 400 digits long, and it's getting chopped off because it can't fit in one horizontal line. How do I make it "roll over" to the next line?

    Here's my code:
            public class RSA extends JFrame
    {
            private String name; // name of the person who owns this cryptosystem
            private String message; // message to be sent
            private BigInteger m; // holds message
            private BigInteger p; // prime 1
            private BigInteger q; // prime 2
            private BigInteger n; // p*q
            private BigInteger e; // GCD(e, phi) = 1
            private BigInteger d; // relatively prime to e in mod phi
            private BigInteger c; // Encrypted message 
            private BigInteger phi; // (p-1)*(q-1)
     
     
            public static void main (String[] args)
            {
                    RSA Alice = new RSASignature("Alice", "message");
                    RSA Bob = new RSASignature("Bob");
     
                    Alice.buildRSA(); // generates e and n for Alice
                    Bob.buildRSA(); // generates e and n for Bob
     
     
     
                    TestFlowLayout frame = new TestFlowLayout(Alice.name, Alice.e, Alice.n, Bob.name, Bob.e, Bob.n);
     
     
                    frame.setSize(300,300);
     
                    frame.setLocationRelativeTo(null);
     
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
                    frame.setVisible(true);



    public class TestFlowLayout extends JFrame
    {
            public TestFlowLayout(String name1, BigInteger e1, BigInteger n1, String name2, BigInteger e2, BigInteger n2)
            {
                    setLayout(new FlowLayout(FlowLayout.LEFT, 100, 200));
     
                    add(new JLabel(name1 + "'s public key: (" + e1 + ", " +  n1 + ")"));
     
                    add(new JLabel(name2 + "'s public key: (" + e2 + ", " +  n2 + ")"));
             }
    }


  2. #2
    Member GoodbyeWorld's Avatar
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    Default Re: Too long of a number for GUI

    You could try adding a JScrollPane to where you're putting the labels. (Though, if you do that, make sure to add the labels to a JPanel or something like that as adding one to a JFrame or other Window will cause an exception. Make the JPanel or whatever the content pane or something of the JFrame.)
    JavaScript is NOT Java.

  3. The Following User Says Thank You to GoodbyeWorld For This Useful Post:

    ineedahero (November 30th, 2013)

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    Default Re: Too long of a number for GUI

    Thanks!

    I've been trying to add the scroll bar, and it doesn't seem to be working. No matter what I do, I can't get the scroll bar to actually come up when I run the program.

    Here's my code...why isn't it working?


    import javax.swing.*;
    import java.awt.*;
     
    public class TestPanels extends JFrame
    {
            public static void main(String[] args)
            {
                  TestPanels frame = new TestPanels();
     
                  frame.setTitle("Panel Test");
                    frame.setSize(400,250);
                    frame.setLocationRelativeTo(null);
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
                    frame.setVisible(true);
            }
     
     
     
            public TestPanels()
            {
                    JPanel panel = new JPanel();
                    JScrollPane scrollPane = new JScrollPane( panel );
     
                    panel.setLayout(new GridLayout(4,3));
                    panel.add( new JButton("6777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777767777777777777777777777777777777777777777777777777777777777677777777777777777777777777777777777777777777777777777777776777777777777777777777777777777777777777777777777777777777767777777777777777777777777777777777777777777777777777777777"));
     
                    add(scrollPane, BorderLayout.EAST);

    }

    All I'm getting is a button at the top of the GUI screen with a portion of the number in it, and then it gets cut off.

  5. #4
    Member GoodbyeWorld's Avatar
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    Default Re: Too long of a number for GUI

    I removed the BorderLayout.EAST part and now it shows the scroll.

     
    import javax.swing.*;
    import java.awt.*;
     
    public class TestPanels extends JFrame
    {
       public static void main(String[] args)
       {
          TestPanels frame = new TestPanels();
     
          frame.setTitle("Panel Test");
          frame.setSize(400,250);
          frame.setLocationRelativeTo(null);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
          frame.setVisible(true);
       }
     
     
     
       public TestPanels()
       {
          JPanel panel = new JPanel();
          JScrollPane scrollPane = new JScrollPane( panel);
     
          panel.setLayout(new GridLayout(4,3));
          panel.add( new JButton("6777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777767777777777777777777777777777777777777777777777777777777777677777777777777777777777777777777777777777777777777777777776777777777777777777777777777777777777777777777777777777777767777777777777777777777777777777777777777777777777777777777"));
     
          add(scrollPane);
       }
     
    }
    JavaScript is NOT Java.

  6. The Following User Says Thank You to GoodbyeWorld For This Useful Post:

    ineedahero (November 30th, 2013)

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    Default Re: Too long of a number for GUI

    Ah, it works for me too! Thank you so much!

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