无法将ImageIcon添加到JFrame

Question

I've been trying to add an image to a JFrame but I can't seem to get it done.

I looked at online tutorials and other similar questions but nothing seems to work.

ImageIcon wiz = new ImageIcon("wizard.png");
ImageIcon assassin = new ImageIcon("assassin.png");

JFrame frame = new JFrame("Select");
frame.setBounds(50, 50,1000, 1000);
JButton w = new JButton("Wizard");
JButton a = new JButton("Assasin");

JFrame f = new JFrame("Image");

JLabel img1 = new JLabel(wiz);

frame.setLayout(null);
f.setLayout(null);
f.setIconImage(wiz.getImage());

w.setBounds(30,380,100,60);
frame.add(w);

a.setBounds(200, 380, 100, 60);
frame.add(a);

f.setVisible(true);
frame.setVisible(true);

Answer 1

I think the main problem in your program is that you try absolute positioning of components (eg JLabel ) using setLayout(null) and setBounds() on components.

In Swing, the correct way to place components is by using layout managers. See this tutorial for details about how to use layout managers: https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

As a sample program, I've successfully set images (both as JFrame 's icon and inside JFrame 's contents area) in below program. Try it and see.

This is a screenshot of my sample JFrame .

import javax.swing.*;

public class FrameWithIcon
{
  public static void main(String[] args)
  {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Since I'm not setting a layout manager to contentPane, it's default (BorderLayout) is used

    //This sets the image in JFrame's content area
    f.getContentPane().add(new JLabel(new ImageIcon("star.png")));

    //This sets JFrame's icon (shown in top left corner of JFrame)
    f.setIconImage(new ImageIcon("star.png").getImage());

    f.setBounds(300, 200, 400, 300);
    f.setVisible(true);
  }
}