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To convert a Java Class into a JPanel representation, follow these steps:

1. Create a new JPanel class
2. In the class, declare an instance variable of the original Java class type
3. Create a constructor that takes an instance of the original Java class as a parameter and assigns it to the instance variable
4. Override the paintComponent() method of the JPanel class
5. In the paintComponent() method, call the draw() method of the original Java class and pass in the graphics context of the JPanel

Here is an example code:

public class MyJavaClass {
    public void draw(Graphics g) {
        // draw something
    }
}

public class MyPanel extends JPanel {
    private MyJavaClass javaClass;

    public MyPanel(MyJavaClass javaClass) {
        this.javaClass = javaClass;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        javaClass.draw(g);
    }
}

You can then create an instance of MyJavaClass and pass it to the constructor of MyPanel. The JPanel will display the drawing from MyJavaClass.