在JFrame中移动JPanel

Question

I'm looking to move a jpanel inside of a JFrame, and it won't seem to budge. I can set it's location in the paint() method, but it won't update in repaint. Please help! Here is my code:

public void paint(Graphics g) {
    g.drawImage(playerImg, x, 50, null);
    this.setLocation(x, 50);
}

public void update() {
    this.repaint();
}


public void keyPressed(KeyEvent key) {
    if(key.getKeyCode() == KeyEvent.VK_UP) {
        x = x + 50;
        System.out.println("e");
        update();
    }
}

Answer 1

"I can set it's location in the paint() method" - Don't, seriously, you should never modify the state of any component within any paint method, in fact, you've broken the paint chain by not calling super.paint , which is going to cause you no end of other problems.

Instead, set the parent containers layout manager to null , you will now find that the component disappears. This is because the layout manager is responsible for setting the size and position of the component, which you will have to take over control of.

Instead of overriding paint you should be overriding paintComponent and calling super.paintComponent . Take a look at Performing Custom Painting for more details