你们好，请问在JBuilder中如何把图片设为背景

Question

你们好，现在有一张格式为.jpg的图片，我想把它设为背景，请问如何实现,谢谢

Answer 1

这需要自己 重载 protected void paintComponent(Graphics g) 函数

Answer 2

我实现了,给你个例子
import javax.swing.*;
import java.awt.*;public class DrawPanel extends JPanel
{
    private Dimension size = new Dimension(20,10);
    Image img;
    int imgWidth,imgHeight;
    
    public void setImage(Image i,int width,int height){
      this.img = i;
      this.imgWidth = width;
      this.imgHeight = height;
      repaint();
    }
    
    public DrawPanel(Dimension size)
    {
        super();
        this.size = size;
    }
    
    public DrawPanel(int width,int height)
    {        
        this(new Dimension(width,height));
    }
    
    public Dimension getPreferredSize()
    {
        return size;
    }
 
    public void paintComponent(Graphics g)
    {
       if(img!=null)
         g.drawImage(img,0,0,imgWidth,imgHeight,this);   
      
    }
};