Question

Java 怎么给面板加背景图片

Answer 1

需要重写Panel的paint方法.

g.drawImage()
这个方法,可以添加图片

追问

能给出个例子吗?

追答

大概是这样,上面加了个按钮.

import java.awt.Dimension;
import java.awt.Graphics;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class App extends JFrame {

public App() {
MyPanel img = new MyPanel();
getContentPane().add(img);
JButton button = new JButton("click");
button.setBounds(100, 100, 200, 20);
img.add(button);
setSize(400, 300);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}

public static void main(String[] args) {
new App();
}

class MyPanel extends JPanel {

public MyPanel() {
setLayout(null);
}

public void paint(Graphics g) {

super.paint(g);
ImageIcon img = new ImageIcon("D:\\1.jpg");
g.drawImage(img.getImage(), 0, 0, 400, 300, this);
}
}
}

Answer 2

new ImageIcont(图片名称)