图片未显示在JFrame中

Question

Why is my image not being displayed? The buttons are always there, but the image does just not appear. It may not be a programming problem. Where should I place the image?

First Class File:

public class start {
    public static void main(String args[]){
        menu m1 = new menu();
        m1.setVisible(true);
    }
}

Second Class File:

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.*;

public class menu extends JFrame{

    private static final long serialVersionUID = 1L;

    public menu(){
        super("Parachute!");
        setSize(1000, 800);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        JPanel main = new JPanel(new GridBagLayout());
        JPanel title = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(15, 15, 15, 15);
        JButton play = new JButton("Play!");
        JButton help = new JButton("Help");
        JButton options = new JButton("Options");
        ImageIcon logo = new ImageIcon("parachute.jpg");
        JLabel imageLogo = new JLabel(logo);
        gbc.gridx = 0;
        gbc.gridy = 0;          

        main.add(play, gbc);

        gbc.gridx = 0;
        gbc.gridy = 1;

        main.add(help, gbc);

        gbc.gridx = 0;
        gbc.gridy = 2;

        main.add(options, gbc);
        title.add(imageLogo);
        add(title, BorderLayout.NORTH);
        add(main, BorderLayout.CENTER);
    }
}

Answer 1

Two things:

First, you are not setting the layout to be borderlayout before using it. Do:

setLayout(new BorderLayout())

Second, to check if the parachute.jpg file is present, you can check like this:

 File f = new File("parachute.jpg");
 System.out.println(f.exists());

If this prints false , it means it could not find the file. In that case , you need to put the image file in correct directory.

I believe you are using an IDE like Netbeans or Eclipse. In that case, put the image in the root directory for the project. For example, you have a project Test . Then the image file should be in the Test folder. The IDE's generally look for files from the root of the project.

PS : As you are new to programming, you should try to follow the conventions of the language you are using. It makes it easy for others to understand your code. Look here for Java conventions.

Answer 2

Have you tried to add main to content? Something like this: getcontent().add(main, BorderLayout.CENTER)