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POhow to change the contents of a JFrame after it has been displayed (java)
 

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  1. POhow to change the contents of a JFrame after it has been displayed (java)
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    <p>I am designing a GUI to emulate a Nurikabe game (description <a href="http://www.nikoli.com/en/puzzles/nurikabe/rule.html" rel="nofollow">here</a>). I basically have two JPanels, and when one of buttons in the control panel (panel 2) is clicked, I want to change the buttons in the game panel (panel 1).</p> <p>Panel 1 has 36 buttons, either non-clickable buttons displaying numbers or clickable blank buttons, all contained in a GridLayout. </p> <p>Panel 2 has three buttons, new puzzle, check puzzle, and reset current puzzle.</p> <p>The problem I am running into is that I cannot figure out how to change Panel 1's buttons when either the reset or new puzzle button is clicked without having to display a new window.</p> <p>Is there a way to do this?</p> <p>Code: (I have removed the check puzzle and reset puzzle buttons)</p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SSCCE extends JFrame { private static final int[][] puzzle1 = { { 0, 1 }, { 1, 0 } }; private static final int[][] puzzle2 = { { 1, 0 }, { 0, 1 } }; private int[][] puzzle; private JFrame frame; private JPanel gridPanel; private JPanel buttonPanel; public SSCCE(final int puzzleNum) { frame = new JFrame("SSCCE"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); if (puzzleNum == 1) { puzzle = puzzle1; } else { puzzle = puzzle2; } setLayout(new BorderLayout()); gridPanel = new JPanel(new GridLayout(2, 2)); for (int i = 0; i &lt; this.puzzle.length; i++) { for (int j = 0; j &lt; this.puzzle[0].length; j++) { JButton button; if (this.puzzle[i][j] &gt; 0) { button = new JButton("" + this.puzzle[i][j]); } else { button = new JButton(); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { JButton temp = ((JButton) event.getSource()); if (temp.getBackground() == Color.BLACK) { // if the button is black, set it to white temp.setBackground(Color.WHITE); } else if (temp.getBackground() == Color.WHITE) { // if the button is white, set it to black temp.setBackground(Color.BLACK); } } }); } button.setBorderPainted(false); button.setContentAreaFilled(false); button.setOpaque(true); button.setBackground(Color.WHITE); gridPanel.add(button); } } buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); JButton changePuzzle = new JButton("New Puzzle"); changePuzzle.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { loadNewPuzzle(puzzleNum); } }); buttonPanel.add(changePuzzle); add(gridPanel, BorderLayout.CENTER); add(buttonPanel, BorderLayout.SOUTH); setTitle("SSCCE"); setLocation(100, 100); pack(); setSize(150, 150); } private void loadNewPuzzle(int puzzleNum) { if (puzzleNum == 1) { puzzleNum = 2; } else { puzzleNum = 1; } // I know this is the wrong way to do it, but I'm not sure how // to do it. SSCCE newGame = new SSCCE(puzzleNum); newGame.setVisible(true); } public static void main(String[] args) { SSCCE game = new SSCCE(1); game.setVisible(true); } } </code></pre>
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    1. USMatthew D
    1. USMatthew D
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    1. COFor better help sooner, post an [SSCCE](http://pscode.org/sscce.html). Note also that an SSCCE Would not have '36' buttons, but only a couple.
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      1. POhow to change the contents of a JFrame after it has been displayed (java)
      1. USAndrew Thompson
 

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