JPanel背景画像の設定

JPanelの背景画像を設定します.
ContainerのpaintComponent()メソッドを書き換え、背景を描きます

package com.work.study.swing;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;

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

/**
 * test setting JPanel's background
 * @author Wison Xu
 */
public class TestJPanel extends JFrame {

	private Dimension frameSize = new Dimension(600, 600);
	
	public TestJPanel() {
		this.setLayout(new BorderLayout());
		this.setSize(frameSize);

		JPanel panel = new JPanel() {
			@Override
			protected void paintComponent(Graphics g) {
				ImageIcon icon = new ImageIcon("D://test.jpg");
				Image img = icon.getImage();
				g.drawImage(img, 0, 0, icon.getIconWidth(), icon.getIconHeight(), icon.getImageObserver());
				
				//  、 ， ， JPanel 
//				g.drawImage(img, 0, 0, frameSize.width, frameSize.height, 
//							0, 0, icon.getIconWidth(), icon.getIconHeight(), icon.getImageObserver());
			}
		};

		this.add(panel, BorderLayout.CENTER);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}

	public static void main(String[] args) {
		TestJPanel test = new TestJPanel();
	}

}