在jframe上显示图像

Question

import javax.swing.*;

public class test extends JFrame {

    public static void main(String args[]) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        frame.setLocation(400, 100);
        frame.setTitle("hello world");

        ImageIcon img = new ImageIcon();
        img.getClass().getResource("/testing/youlost.png");
        JPanel panel = new JPanel();
        JLabel label = new JLabel(img);
        panel.add(label);
        panel.setVisible(true);
        frame.pack();
    }
}

I run these codes in eclipse and the frame did pop up because of frame.pack() and did not give any errors but the image did not appear. could someone help me with the code?

Answer 1

The mistake is that you are not setting the image for your ImageIcon .

ImageIcon img = new ImageIcon(test.class.getResource("image.png"));    

And don't forget to add the JPanel into the JFrame .

frame.add(panel);

---

Full code would be,

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setLocation(400, 100);
frame.setTitle("hello world");

ImageIcon img = new ImageIcon(test.class.getResource("image.png"));
JPanel panel = new JPanel();
JLabel label = new JLabel(img);
panel.add(label);
panel.setVisible(true);

frame.add(panel);
frame.pack();

Answer 2

I think the problem is that you call

frame.setVisible(true);

right after creating the object. Try calling it after

frame.pack();

In addition to that, you need to add the panel to the frame using

frame.add(panel);