Membuat Round Edge JFrame

frameJFrame.java

import java.awt.EventQueue;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import java.awt.Font;

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

	private JPanel contentPane;
	private JButton btnClose;
	private JButton btnMax;
	private JButton btnMin;
	private JLabel lblWall;
	private JLabel lblText;

	/**
	 * Create the frame.
	 */
	public frameJFrame() 
	{
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 564, 355);
		setUndecorated(true);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		lblText = new JLabel("Round Edge JFrame");
		lblText.setBounds(175, 0, 161, 25);
		contentPane.add(lblText);
		lblText.setFont(new Font("Comic Sans MS", Font.BOLD, 16));
		
		btnMin = new JButton("");
		btnMin.setBounds(420, 0, 44, 25);
		contentPane.add(btnMin);
		btnMin.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/shapedJFrame/minimize.png"));
		
		btnMax = new JButton("");
		btnMax.setBounds(463, 0, 44, 25);
		contentPane.add(btnMax);
		btnMax.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/shapedJFrame/maximize.png"));
		
		btnClose = new JButton("");
		btnClose.setBounds(506, 0, 52, 25);
		contentPane.add(btnClose);
		btnClose.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/shapedJFrame/close.png"));
		
		lblWall = new JLabel("");
		lblWall.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/shapedJFrame/wall.jpg"));
		lblWall.setBounds(0, 0, 564, 355);
		contentPane.add(lblWall);
		btnClose.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				System.exit(0);
			}
		});
		btnMax.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				if(getExtendedState() == NORMAL)
				{
					setExtendedState(MAXIMIZED_BOTH);
				}
				else
				{
					setExtendedState(NORMAL);
				}
			}
		});
		btnMin.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent act)
			{
				setState(ICONIFIED);
			}
		});
		
		setShape(new RoundRectangle2D.Double(0,0,getWidth(),getHeight(),20,40));
		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");
					frameJFrame frame = new frameJFrame();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
}