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Java Swing - 如何创建透明的Background JFrame

jframe 【jframe】
我们想知道如何创建透明的Background JFrame。
代码展示 运行结果 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Window;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;

public class Main extends JFrame {
  public Main() {
    this.setLayout(new FlowLayout());
    this.add(new JButton("test"));
    this.add(new JCheckBox("test"));
    this.add(new JRadioButton("test"));
    this.add(new JProgressBar(0, 100));
    JPanel panel = new JPanel() {
      @Override
      public Dimension getPreferredSize() {
        return new Dimension(400, 300);
      }
      @Override
      protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.red);
        g.fillRect(0, 0, getWidth(), getHeight());
      }
    };
    panel.add(new JLabel("Label"));
    add(panel);
    setSize(new Dimension(400, 300));
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    Window w = new Main();
    w.setVisible(true);
    com.sun.awt.AWTUtilities.setWindowOpacity(w, 0.7f);
  }
}