Question

怎样实现半透明的JPanel

Answer 1

java swing中设置组件透明度的方法如下：

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package src;
import java.awt.*;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class MyPanel extends JPanel{
private Image image = null;
public MyPanel(Image image) {
this.image = image;
}
//固定背景图片，允许这个JPanel可以在图片上添加其他组件
protected void paintComponent(Graphics g) {
g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), this);
}
}
测试JFrame
package src;

import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;