Java Swing - 如何在Jpanel北部添加圖像

Question

我想在NORTH的NORTH部分添加圖像，但它不起作用。 我該怎麼辦？

class PanelGlowny extends JPanel 
{  
    PanelGlowny() 
    {   
     this.setLayout(new BorderLayout()); 
     ImageIcon imageurl = new ImageIcon("logo.jpg"); 
     Image img = imageurl.getImage(); 
     this.add(img, BorderLayout.NORTH); 

    } 
} 

public class Formatka extends JFrame 
{  
    private PanelGlowny panel = new PanelGlowny(); 

    public Formatka() 
    {  
     ... 
     add(panel); 
    } 
} 

Answer 1

創建從ImageIcon新JLabel並添加到您的JPanel。

Answer 2

下面是您的代碼的工作修改。你應該可以按原樣運行它。實質上，您不能簡單地將ImageIcon添加到JPanel。您需要先將其包裝在JLabel中。

import java.awt.BorderLayout; 
import java.net.URL; 

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

public class Test2 
{ 
    public static class PanelGlowny extends JPanel 
    { 

     public PanelGlowny() 
     { 

      this.setLayout(new BorderLayout()); 

      // incorporated @nIcE cOw's comment about loading classpath resources 
      URL url = getClass().getResource("logo.jpg") 
      ImageIcon imageicon = new ImageIcon(url); 
      JLabel label = new JLabel(imageicon); 

      this.add(label, BorderLayout.NORTH); 

     } 
    } 

    public static void main(String[] args) 
    { 
     JFrame frame = new JFrame(); 

     frame.add(new PanelGlowny()); 

     frame.setSize(400, 400); 

     frame.setVisible(true); 
    } 

}