This POOR JLabel shows the picture only after RESIZING The Frame. Why?

Question

This is the simplest code to me.. yet failing to show up my uploaded picture from my desktop, Rather when I resize the JFrame window with mouse, it shows up.

This case happens both in Netbeans and Eclipse... can you explain the reason behind this???? Thanks in advance..

    JFrame f=new JFrame("My Frame");
        f.setSize(1500,1500);
        f.setVisible(true);
    //  f.setLayout(new FlowLayout());
        JLabel l=new JLabel("A pic in next Label");
        f.add(l);
        
        
        JLabel lp=new JLabel();
        lp.setIcon(new ImageIcon("aaa.jpg"));
        f.add(lp);

You are showing the frame before adding the labels. So only when you resize the frame it re-renders and you see the image. You should fist add the labels and then call .pack() and then .visible(). Hope it helps — MissingSemiColon, Jul 15 '21 at 15:15
You have to setSize and setVisible after you've added the JLabel components. — Gilbert Le Blanc, Jul 15 '21 at 15:16
1) For better help sooner, [edit] to add a [MCVE] or [Short, Self Contained, Correct Example](http://www.sscce.org/). 2) One way to get image(s) for an example is to hot link to images seen in [this Q&A](http://stackoverflow.com/q/19209650/418556). E.G. The code in [this answer](https://stackoverflow.com/a/10862262/418556) hot links to an image embedded in [this question](https://stackoverflow.com/q/10861852/418556). — Andrew Thompson, Jul 15 '21 at 15:37
As an aside. it's odd that this `// f.setLayout(new FlowLayout());` is commented out & the code is trying to add 2 labels (without constraints specified) to a `BorderLayout` (the default layout of the content pane of a `JFrame`). Only one will show, but setting a `FlowLayout` would be a way around that. It was .. pure luck that in my example, I reduced it from two components to a single one - which will also work. — Andrew Thompson, Jul 15 '21 at 19:19

score 4 · Accepted Answer · answered Jul 15 '21 at 17:49

This is an MRE / SSCCE that demonstrates how to load an image and display it in a correctly sized frame. Read the code comments for further explanations.

Note, the code might use an EmptyBorder for white space around the label. But I wanted to demonstrate it is not a pixel bigger (or smaller) than needed.

import javax.swing.*;
import java.net.URL;

public class DisplayAndSizeAnImageFrame {

    // pathetic exception handling used here, BNI
    DisplayAndSizeAnImageFrame() throws Exception {
        JFrame f = new JFrame("Image Frame");
        //f.setSize(1500,1500); Just a guess. Use pack() for right size
        //f.setVisible(true);   not YET
        JLabel l=new JLabel("A pic in this label");
        f.add(l);
        
        // JLabel lp=new JLabel(); Don't need to use TWO labels!
        l.setIcon(new ImageIcon(new URL("https://i.stack.imgur.com/P59NF.png")));
        // Image from http://stackoverflow.com/q/19209650/418556
        
        // now all components are added, size the frame..
        f.pack();
        f.setVisible(true);
    }

    public static void main(String[] args) {
        Runnable r = () -> {
            try {
                new DisplayAndSizeAnImageFrame();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

Excellent.. wowwwww.. Thank you so muchhhhhhhh... dear @Andrew Thompson — Shawon Eric, Jul 16 '21 at 15:45

This POOR JLabel shows the picture only after RESIZING The Frame. Why?

1 Answers1