MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Color;
import java.awt.FlowLayout;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JFrame {

    public MainClass() {
        super("Opaque JPanel Demo");
        setSize(400, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        JPanel opaque = createNested(true);
        JPanel notOpaque = createNested(false);

        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(opaque);
        getContentPane().add(notOpaque);
    }

    public static void main(String[] args) {
        MainClass oe = new MainClass();
        oe.setVisible(true);
    }

    public JPanel createNested(boolean opaque) {
        JPanel outer = new JPanel(new FlowLayout());
        JPanel inner = new JPanel(new FlowLayout());
        outer.setBackground(Color.white);
        inner.setBackground(Color.black);

        inner.setOpaque(opaque);
        inner.setBorder(BorderFactory.createLineBorder(Color.gray));

        inner.add(new JButton("Button"));
        outer.add(inner);

        return outer;
    }
}