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POWhy is nothing painted when I call repaint()?
 

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  1. POWhy is nothing painted when I call repaint()?
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    <p>First of all, I am a beginner. I'm trying to make a puzzle game using an array of <code>Piece</code>s. Each <code>Piece</code> represents a number from 1 to 9. I am trying to paint using <code>paintComponent(Graphics g)</code>, but when I call the <code>repaint()</code> method, nothing happens. There is no error, so there must be some point I am not aware of.</p> <p>I'm using NetBeans. I created a new desktop application and then added a <code>JPanel</code> and a <code>JButton</code>.</p> <p>This is my code:</p> <pre><code>public class PuzzleGame2View extends FrameView { public Piece pieces[][]; Drawing outer = new Drawing(); public PuzzleGame2View(SingleFrameApplication app) { super(app); initComponents(); //more code that netbeans automatically wrote...... public class Drawing extends JFrame implements MouseListener{ public void paintComponent(Graphics g ){ g = jPanel1.getGraphics(); super.paintComponents(g); for (int i = 0; i &lt; pieces.length; i++) { for (int j = 0; j &lt; pieces.length; j++) { if (pieces[i][j].getText()!=null) { g.setColor(Color.red); g.fillRect(i*100, j*100, 100, 100); g.setColor(Color.BLACK); g.drawString(pieces[i][j].getText(), i*100 + 50, j*100 + 20); } } } } public void makePieces(){ pieces = new Piece[3][3]; for (int i = 0; i &lt; pieces.length; i++) { for (int j = 0; j &lt; pieces.length; j++) { if (i == 2 &amp;&amp; j == 2){ pieces[i][j] = new Piece(j, j, null); } else pieces[i][j] = new Piece(j, j, "" + (i*3+j+1) ); } } } </code></pre> <p>I am trying to call the <code>repaint()</code> method when I click the button.</p> <pre><code>private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: makePieces(); outer.repaint(); } </code></pre> <p>Here's the class <code>Piece</code>:</p> <pre><code>package puzzlegame2; public class Piece { private int row,count; private String text; public Piece(int row, int count, String text) { this.row = row; this.count = count; this.text = text; } public String getText() { return text; } public void setText(String text) { this.text = text; } } </code></pre> <p>It's just the first step; there are many things to do. But I can't go on until I totally understand how <code>public void paintComponent(Graphics g)</code> and <code>repaint()</code> work.</p> <p>So, please, any help would be appreciated.</p>
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    1. COThe line g = jPanel1.getGraphics(); in the public void paintComponent(Graphics g ) is nothing i was just trying something and it didn't work out
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    2. COI suggest you create the smallest runnable program that can demonstrate the problem and repost your code.
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      1. USwillcodejavaforfood
    3. COHave an upvote for saying "But I can't go on until I totally understand how `public void paintComponent(Graphics g)` and `repaint()` work." A lot of people would just try to muddle through it.
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