Thread: 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 + ")"));
         }
}

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.

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