Membuat Minimize, Maximize, dan Close Frame dengan JButton

ClPanelTransparant.java

import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D; 

@SuppressWarnings("serial")
public class ClPanelTransparant extends JPanel
{
	private Color clr;
	
	public ClPanelTransparant()
	{
		setOpaque(false);
		clr = new Color(getBackground().getRed(), getBackground().getRed(), getBackground().getGreen(),90);
	}	
	
	public void setBackground(Color bg)
	{
		super.setBackground(bg);
		clr = new Color(getBackground().getRed(), getBackground().getRed(), getBackground().getGreen(),90);
		repaint();
	}
	
	protected void paintComponent(Graphics graph)
	{
		super.paintComponent(graph);
		Graphics2D g2d = (Graphics2D) graph.create();
		g2d.setColor(clr);
		g2d.fillRect(0, 0, getWidth(), getHeight());
		g2d.dispose();
	}
	
}

frameButtonIcon.java

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

@SuppressWarnings("serial")
public class frameButtonIcon extends JFrame {

	private JPanel contentPane;
	private JPanel panel;
	private JLabel lblWall;
	private JButton btnMinimize;
	private JButton btnMaximize;
	private JButton btnClose;
	
	/**
	 * Create the frame.
	 */
	public frameButtonIcon()
	{
		setTitle("Minimize, Maximize, and Close Button");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 593, 395);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		panel = new ClPanelTransparant();
		panel.setBounds(6, 0, 585, 59);
		contentPane.add(panel);
		panel.setLayout(null);
		
		btnMinimize = new JButton("");
		btnMinimize.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/buttonIcon/minimize.png"));
		btnMinimize.setToolTipText("Minimize");
		btnMinimize.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				setState(ICONIFIED);
			}
		});
		btnMinimize.setBounds(0, 6, 73, 47);
		panel.add(btnMinimize);
		
		btnMaximize = new JButton("");
		btnMaximize.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/buttonIcon/maximize.png"));
		btnMaximize.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				if(getExtendedState() == NORMAL)
				{
					setExtendedState(MAXIMIZED_BOTH);
				}
				else
				{
					setExtendedState(NORMAL);
				}
			}
		});
		btnMaximize.setToolTipText("Maximize");
		btnMaximize.setBounds(85, 6, 73, 47);
		panel.add(btnMaximize);
		
		btnClose = new JButton("");
		btnClose.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/buttonIcon/close.png"));
		btnClose.setToolTipText("Close");
		btnClose.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				System.exit(0);
			}
		});
		btnClose.setBounds(170, 6, 73, 47);
		panel.add(btnClose);
		
		lblWall = new JLabel("");
		lblWall.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/buttonIcon/wall1.jpg"));
		lblWall.setBounds(0, -11, 591, 380);
		contentPane.add(lblWall);
		setLocationRelativeTo(null);
	}
	
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
					frameButtonIcon frame = new frameButtonIcon();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
}