Java Swing How to - Create translucent JFrame

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Question

We would like to know how to create translucent JFrame.

Answer

import java.awt.Color;
//from ww  w.  ja  v a  2s. c  o  m
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class Main {
  public static JComponent makeUI() {
    JPanel p = new JPanel();
    p.setBackground(new Color(.5f, .5f, .5f, .5f));
    p.add(new JComboBox<String>(new String[] { "aaa", "bb", "c" }));
    JComboBox c = new JComboBox<String>(new String[] { "aaa", "bb", "c" });
    p.add(c);
    return p;
  }

  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame f = new JFrame();
    f.setBackground(new Color(0, true)); // 1.7.0
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(makeUI());
    f.setSize(320, 240);
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}

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