Membuat Shadow JFrame

ClButtonTransparan.java

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import javax.swing.*;

@SuppressWarnings("serial")
public class ClButtonTransparan extends JButton{
	  private static final Color TL = new Color(1f,1f,1f,.2f);
	  private static final Color BR = new Color(0f,0f,0f,.4f);
	  private static final Color ST = new Color(1f,1f,1f,.2f);
	  private static final Color SB = new Color(1f,1f,1f,.1f);
	  private Color ssc;
	  private Color bgc;
	  private int r = 8;
	  public ClButtonTransparan(String text) {
	    super(text);
	  }
	  public ClButtonTransparan(String text, Icon icon) {
	    super(text, icon);
	  }
	  @Override public void updateUI() {
	    super.updateUI();
	    setContentAreaFilled(false);
	    setFocusPainted(false);
	    setOpaque(false);
	    setForeground(Color.WHITE);
	  }
	  @Override protected void paintComponent(Graphics g) {
	    int x = 0;
	    int y = 0;
	    int w = getWidth();
	    int h = getHeight();
	    Graphics2D g2 = (Graphics2D)g.create();
	    g2.setRenderingHint(
	      RenderingHints.KEY_ANTIALIASING,
	      RenderingHints.VALUE_ANTIALIAS_ON);
	    Shape area = new RoundRectangle2D.Float(x, y, w-1, h-1, r, r);
	    ssc = TL;
	    bgc = BR;
	    ButtonModel m = getModel();
	    if(m.isPressed()) {
	      ssc = SB;
	      bgc = ST;
	    }else if(m.isRollover()) {
	      ssc = ST;
	      bgc = SB;
	    }
	    g2.setPaint(new GradientPaint(x, y, ssc, x, y+h, bgc, true));
	    g2.fill(area);
	    g2.setPaint(BR);
	    g2.draw(area);
	    g2.dispose();
	    super.paintComponent(g);
	  }
	}

ClPanelTransparan.java

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

@SuppressWarnings("serial")
public class ClPanelTransparan extends JPanel
{
	private Color clr;
	
	public ClPanelTransparan()
	{
		setOpaque(false);
		clr = new Color(getBackground().getRed(), getBackground().getRed(), getBackground().getGreen(),50);
	}	
	
	public void setBackground(Color bg)
	{
		super.setBackground(bg);
		clr = new Color(getBackground().getRed(), getBackground().getRed(), getBackground().getGreen(),50);
		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();
	}
	
}

shadowJFrame.java

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
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.JLabel;
import javax.swing.JTextField;
import javax.swing.ImageIcon;
import java.awt.Font;

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

	private JPanel contentPane;
	private JButton btnSimpan;
	private JLabel lblId;
	private JTextField txtID;
	private JTextField txtJudul;
	private JLabel lblJudul;
	private JTextField txtStock;
	private JButton btnUbah;
	private JPanel panel;
	private JLabel lblWall;
	private JLabel lblIcon;
	
	/**
	 * Create the frame.
	 */
	public shadowJFrame() 
	{
		setTitle("Shadow Frame");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 665, 380);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		btnSimpan = new ClButtonTransparan("Simpan");
		btnSimpan.setIcon(new ImageIcon(shadowJFrame.class.getResource("/shadowFrame/simpan.png")));
		btnSimpan.addActionListener(new ActionListener() 
		{
			public void actionPerformed(ActionEvent act)
			{
				getRootPane().getGlassPane().setVisible(true);
                JOptionPane.showMessageDialog(shadowJFrame.this, "Data berhasil Disimpan","Pesan",JOptionPane.INFORMATION_MESSAGE, new ImageIcon(("src/shadowFrame/popSimpan.png")));
                getRootPane().getGlassPane().setVisible(false);
			}
		});
		btnSimpan.setBounds(131, 258, 122, 51);
		contentPane.add(btnSimpan);
		
		btnUbah = new ClButtonTransparan("Ubah");
		btnUbah.setIcon(new ImageIcon(shadowJFrame.class.getResource("/shadowFrame/ubah.png")));
		btnUbah.addActionListener(new ActionListener() 
		{
			public void actionPerformed(ActionEvent act) 
			{
				getRootPane().getGlassPane().setVisible(true);
                JOptionPane.showMessageDialog(shadowJFrame.this, "Data berhasil Diubah","Pesan",JOptionPane.INFORMATION_MESSAGE, new ImageIcon(("src/shadowFrame/popUpdate.png")));
                getRootPane().getGlassPane().setVisible(false);
			}
		});
		btnUbah.setBounds(323, 258, 129, 51);
		contentPane.add(btnUbah);
		
		panel = new ClPanelTransparan();
		panel.setBounds(131, 19, 377, 215);
		contentPane.add(panel);
		panel.setLayout(null);
		
		txtID = new JTextField();
		txtID.setBounds(84, 20, 122, 27);
		panel.add(txtID);
		txtID.setColumns(10);
		
		lblId = new JLabel("ID : ");
		lblId.setFont(new Font("Comic Sans MS", Font.BOLD, 12));
		lblId.setForeground(new Color(255, 255, 255));
		lblId.setBounds(6, 26, 60, 15);
		panel.add(lblId);
		
		lblJudul = new JLabel("Judul : ");
		lblJudul.setFont(new Font("Comic Sans MS", Font.BOLD, 12));
		lblJudul.setForeground(new Color(255, 255, 255));
		lblJudul.setBounds(6, 71, 60, 15);
		panel.add(lblJudul);
		
		txtJudul = new JTextField();
		txtJudul.setBounds(84, 65, 281, 27);
		panel.add(txtJudul);
		txtJudul.setColumns(10);
		
		JLabel lblStock = new JLabel("Stock : ");
		lblStock.setFont(new Font("Comic Sans MS", Font.BOLD, 12));
		lblStock.setForeground(new Color(255, 255, 255));
		lblStock.setBounds(6, 120, 60, 15);
		panel.add(lblStock);
		
		txtStock = new JTextField();
		txtStock.setBounds(84, 114, 122, 27);
		panel.add(txtStock);
		txtStock.setColumns(10);
		
		lblIcon = new JLabel("");
		lblIcon.setIcon(new ImageIcon(shadowJFrame.class.getResource("/shadowFrame/icon.png")));
		lblIcon.setBounds(520, 206, 137, 141);
		contentPane.add(lblIcon);
		
		lblWall = new JLabel("");
		lblWall.setIcon(new ImageIcon(shadowJFrame.class.getResource("/shadowFrame/wall.jpg")));
		lblWall.setBounds(0, -15, 663, 368);
		contentPane.add(lblWall);
		setLocationRelativeTo(null);
		getRootPane().setGlassPane(new JComponent()
		{
            public void paintComponent(Graphics g) 
            {
                g.setColor(new Color(0, 0, 0, 100));
                g.fillRect(0, 0, getWidth(), getHeight());
                super.paintComponent(g);
            }
        });
	}

	/**
	 * 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");
					shadowJFrame frame = new shadowJFrame();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
}