Java – save JPanel graphics

I'm not sure how graphics work in Java, so I can't debug my problem

This is a quick code that will demonstrate my problem

public class MyFrame extends JPanel{
private int property;
private int x;
private int y;

public MyFrame(int xp,int yp){
x = xp;
y = yp;
}

@override
public void paintComponent(Graphics g){
super.paintComponent(g);
g.fillRect(x,y,5,5);
}
public void setProperty(int p){
property = p;
}
}

public class MainClass() extends JPanel{
private ArrayList<MyFrame> frames = new ArrayList<MyFrame>;
private MyFrame currentFrame = new MyFrame();

public void addFrame(int x,int y){
this.remove(currentFrame);
currentFrame = new MyFrame();
this.add(currentFrame);
frames.add(currentFrame);
}

public void setFrame(int frame){
this.remove(currentFrame);
currentFrame = frames.get(frame);
this.add(currentFrame);
}

}

Absrtact: I want the panel to display the correct frame when calling setframe Currently, when I do this, the setup framework will be blank

Solution

You seem to be exchanging JPanel into another JPanel, and when you do this, you must consider the layout used by the container -JPanel, and you need to call revalidate after reworking and remap the container -JPanel..

But why not save images by using CardLayout to swap jpanels or jlabel and imageicons instead of screwing up all this?