Modify « JPanel « Java Swing Q&A

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1. how to modify current JPanel and JFrame in java    stackoverflow.com

I am using the following code: 

class ButtonPanel extends JPanel implements ActionListener
{
   public ButtonPanel()
   {
       yellowButton=new JButton("Yellow");
      ...

2. Modifying and reloading JPanel component    java-forums.org

I am relatively new to Java, been taking a class for a year now, and I'm currently working on a Mastermind game. I've made it quite fancy and way too complex for my skills, so I've run into a snag. I have created JLabels setting a specific icon image for each of the bullets telling users if their selection was right ...