Develop Reference

Why is my Image Icon not showing up in my JFrame?

I am trying to display an image icon PNG, I have properly referred to the file called "logo.png" inside the project folder and set the icon as seen below. I'm not sure where I went wrong as I followed this tutorial starting around minute 14 (https://www.youtube.com/watch?v=Kmgo00avvEw&t=298s), I have made sure the code was correct but I'm still unable to get the image to appear beside the text when I run the code in Eclipse.
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Rectangle;
import javax.swing.ImageIcon;
public class mainClass {
public static void main(String[] args) {
// JFrame is a GUI frame to add components to
//JLabel a GUI display area for a string of texts and image.
ImageIcon image = new ImageIcon("logo.png");
JLabel label = new JLabel(); //creates JLabel
label.setText("Welcome to Magic Shape"); //sets text for label
label.setIcon(image);
JFrame frame = new JFrame(); //creates JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //close operations when...
frame.setSize(500, 500); //sets size of JFrame (can resize)
frame.setTitle("Magic Shape"); //title of Program
frame.setVisible(true); //makes frame visible
frame.add(label); //adds label
}
}

package be.project.jframe;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.io.IOException;
import java.io.InputStream;
public class Main {
public static void main(String[] args) throws IOException {
// JFrame is a GUI frame to add components to
//JLabel a GUI display area for a string of texts and image.
InputStream stream = Main.class.getResourceAsStream("/be/project/jframe/icons/400.png");
ImageIcon icon = new ImageIcon(ImageIO.read(stream));
JLabel jLabelObject = new JLabel("Welcome to Magic Shape");
jLabelObject.setIcon(icon);
JFrame frame = new JFrame(); //creates JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //close operations when...
frame.setSize(800,600);
frame.setTitle("Magic Shape"); //title of Program
frame.setVisible(true); //makes frame visible
frame.add(jLabelObject); //adds label
frame.pack();
}
}

According to your code, Java searches for the file logo.png in the working directory. The working directory is the value returned by System.getProperty("user.dir"). If Java does not find the file, it essentially creates a null icon and that's why you aren't seeing the icon.
Just make sure you put the file in the correct directory.
Refer to the following.
Accessing Resources
Retrieving Resources
How to Use Icons

Make sure the png file is placed at current working directory:
System.out.println(System.getProperty("user.dir"));

JPanel not showing inside JFrame in Java

I know this question has been asked a lot and I have done my research but still can not find anything. Below is proof of this before anyone gets upset:
I found this link:
https://coderanch.com/t/563764/java/Blank-Frame-Panel
and this:
Adding panels to frame, but not showing when app is run
and this:
Why shouldn't I call setVisible(true) before adding components?
and this:
JPanel not showing in JFrame?
But the first question says use repaint which I tried with no fix and the second and third to last questions talk about putting setVisible after components added which I have.
The last one talks about making the users JPanelArt a extension (done so) of JPanel instead of JFrame and not to make a frame in a frame constructor (also have not done)
When ever I run this I just get a blank frame, as if the panel was never added in.
I apologise if I have missed something in those links. Anyway below is my classes:
GUI.java (extends JFrame)
package javaapplication2;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GUI extends JFrame{
public GUI(String name) {
super(name);
getContentPane().setLayout(null);
JPanel myPanel1 = new GUIPanel();
myPanel1.setLocation(20, 20);
getContentPane().add(myPanel1);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setResizable(true);
}
public static void main(String[] args) {
JFrame frame = new GUI("Game");
frame.setVisible(true);
}
}
GUIPanel.java (extends JPanel)
package javaapplication2;
import java.awt.*;
import javax.swing.*;
public class GUIPanel extends JPanel {
JButton start;
JButton inspect1;
JButton inspect2;
JButton inspect3;
JButton suspect;
public GUIPanel() {
setLayout(new BorderLayout());
start = new JButton("Start Game");
inspect1 = new JButton("Inspect 1");
inspect2 = new JButton("Inspect 2");
inspect3 = new JButton("Inspect 3");
suspect = new JButton("Choose Suspect");
add(start, BorderLayout.WEST);
add(inspect1, BorderLayout.WEST);
add(inspect2, BorderLayout.WEST);
add(inspect3, BorderLayout.WEST);
add(suspect, BorderLayout.WEST);
}
}
I know it is very simple, but that is because I am following a tutorial from my lecturer to get the hang of things as I previously used a GUI builder which someone in this community pointed out to me is not good to start with (very correct!)

The issue lies in your GUI class when you call getContentPane().setLayout(null). Because of this method call, your JFrame is not displaying anything. If you remove it, your elements should show up.
I also noticed that you were setting each JButton to have a constraint of BorderLayout.WEST. This will most likely put your JButtons on top of each other and render only one of them.

Putting everything into a JFrame

I want to know how to put put console output into a JFrame. For example, putting this output into a JFrame:
import static java.lang.System.out;
public class frame{
public static void main(String [] args){
out.println("hello");
}
}
How is it possible?

You need to set up the JFrame first.
JFrame frame = new JFrame("title");
Then, set the properties of the JFrame:
frame.setSize(1280,720); //Sets the program's size
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Tells the program to exit on close
frame.setResizable(true); //Tells the program if resizing is enabled
Then, create a panel to store the components:
JPanel p = new JPanel();
After that, you must add the panel to the JFrame like so:
frame.add(p);
Then, with that done, you can use the components supplied in the swing framework, and add them to the panel. A reference for these components can be found here: http://docs.oracle.com/javase/tutorial/uiswing/components/componentlist.html.
To create a component, use the following code:
JLabel label = new JLabel();
Then, use it's build in functions to change it:
label.setText("new text");
Then, once again, to add a component to a panel, use the panel's add() method:
panel.add(label);
Those are just the basics of making a GUI with java. A full tutorial can be viewed here:
http://docs.oracle.com/javase/tutorial/uiswing/
Good Luck!

I can help you with this, but let me please fix some syntax errors you have. When you put the import, an import can't be static (that I know of) and when you want to print out something using "System.out.print" or "System.out.println" you MUST include the "System" part of the line. If you want to add text to a a JFrame use the JLabel to import both just do this bit of code:
import javax.swing.*;
That should import all of your swing elements such as JLabel and JFrame and JPanel, and try this code it will make a window that will have a button and a label. The button doesn't do anything in this code:
import javax.swing.*;
public class main{
public static void main(String[] args)
{
/*
* Creates the frame, makes it visible, and makes
* appear in the center of the screen. While also making it have a close operation
*/
JFrame frame = new JFrame("Button");
frame.setVisible(true);
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
//Creates the panel, and adds it to the frame
JPanel panel = new JPanel();
frame.add(panel);
//Creates the label and adds it to the panel, also sets the text
JLabel label = new JLabel();
label.setText("Welcome" + "\n" + "\n");
panel.add(label);
//Creates the button and adds it to the panel
JButton button1 = new JButton("Button 1");
panel.add(button1);
}
}

1.If you want to use JFrame you have to extend your class to a subclass of JFrame:
public class frame extends JFrame {}
2.a)If you want to put Text in your Frame use JLabel and add it to your frame:
JLabel hello = new JLabel("Hello");
add(hello);
2.b)If you want a console output just call System.out.println() in the constructor
Here is a small example class:
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Frame extends JFrame {
public static void main(String args[]) {
new Frame();
}
Frame() {
System.out.println("Hello");
JLabel hello = new JLabel("Hello");
add(hello);
this.setSize(100, 100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
}
have a look to the oracle lessons... or any java book!

If that is the case, I don't want to get into GUI just yet. (Learning from a book) Can I convert my current project to a jar file and have it automatically open a command prompt window upon double click?

I cannot implement a image onto a GUI

I am using eclipse and I want to add a image onto a label or a logo for my GUI.
I want it to LOOK LIKE THIS!
I uploaded it onto the web because I dont have 10 reputation.
(Names cool program) is the image
import java.awt.*;
import javax.swing.*;
import javax.swing.JFrame;
public class MainClass extends JFrame{ // super class JFrame
// Kind of a tutorial for creating GUI's in java
private JLabel label;
private JLabel label1;
private JButton button;
private JTextField textfeild;
private ImageIcon image1; // image for my logo
public MainClass () {
setLayout (new FlowLayout());
image1 = new ImageIcon (getClass ().getResource ("logo.gif")); // declares image
label = new JLabel ("This is the label");
add (label);
label1 = new JLabel (image1); // adds image
add (label1);
textfeild = new JTextField (15);
add (textfeild);
button = new JButton ("Click");
add (button);
}
public static void main(String[] args) {
MainClass gui = new MainClass ();
gui.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); // creates window
gui.setSize (300,300);
gui.setVisible (true);
gui.pack ();
gui.setTitle ("Title");
}
}
Program compiles but doesn't run. Gives me
Exception in thread "main" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at JonsCalc.<init>(JonsCalc.java:18)
at JonsCalc.main(JonsCalc.java:38)

This piece of code getClass().getResource ("logo.gif") means that the image should be loaded from the same location as your class MainClass has. Check that you image is in the same package as MainClass. If you use Eclipse, than put image file in the package in src folder, it will be copied to bin automatically.

I suggest you create a package exclusively for your images/icons, then create a single loader class there named 'ImageLoader' or whatever you want. You can then use this code...
new ImageLoader().getClass().getResource("NAME_OF_IMAGE"));

Right click on your class then go to new. Click on new Source Folder. Finally move your images in that folder. Now you can use that code.

If you are using Eclipse, copy your images to your package and your project's bin folder. Then just type
image1 = new ImageIcon(this.getClass().getResource("filename.filetype"));

Java JFrame Not Displayed (Just Titlebar)

I know this is something very simple, but as a complete Java newbie I'm missing it and someone pointing it out would be infinitely helpful. I've stared at the screen and moved things around and still nothing.
Screenshot:
http://i.imgur.com/dwH60.png
This is all that comes up when this is run.
fullGUI.java:
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
public class fullGUI extends JFrame
{
JFrame frame = new JFrame(); //creates frame
public fullGUI() // constructor
{
//setLayout(new BorderLayout());
//add(new shipGrid(), BorderLayout.NORTH);
//add(new shipGrid(), BorderLayout.NORTH);
add(new JRadioButton("Horizontal"), BorderLayout.WEST);
add(new JRadioButton("Vertical"), BorderLayout.WEST);
add(new JTextArea("Instructions to player will go here"), BorderLayout.CENTER);
frame.setSize(400,600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Battleship!");
frame.pack(); //sets appropriate size for frame
frame.setVisible(true);
}
}
...called by...
test.java
public class test
{
public static void main(String[] args)
{
new fullGUI();
}
}

name classes in Java from a capital letter
FullGUI already extends JFrame, so no need to create another JFrame inside it
call getContentPane.add() to add to JFrame
use SwingUtilities.invokeLater
So overall something like this
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
public class FullGUI extends JFrame
{
public FullGUI() // constructor
{
getContentPane().add(new JRadioButton("Horizontal"), BorderLayout.WEST);
getContentPane().add(new JRadioButton("Vertical"), BorderLayout.WEST);
getContentPane().add(new JTextArea("Instructions to player will go here"), BorderLayout.CENTER);
setSize(400,600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Battleship!");
pack(); //sets appropriate size for frame
setVisible(true);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new FillGU();
}
});
}

Problem is that you are extending JFrame in your class and creating new object "frame". You're adding components such as JRadioButton or JTextArea into fullGUI and other settings of the JFrame are applicable to frame object. It's up to you which approach you're going to choose, but pick one of them. You can extend JFrame and your class will be a child of JFrame which means you can call all public or protected methods from parent class, no need to create new instance of JFrame. Other way is to not extend JFrame and you have to create new JFrame object instead.

frame.pack() is causing your JFrame to resize according to its contents.
If you have frame.setSize(400,600), even if you don't add anything to its content pane,
the frame will be displayed with size 400x600.
But when you call frame.pack(), the frame will resize. In your case, your frame's content pane does not contain anything. Therefore the pack() method resizes it to only your title bar.

As Nikolay Kuznetsov said in earlier answer, you have extended Jframe in fullGUI so no need to create new Jframe in that class, because every instance of FullGUI will be a new frame.
With you code what happened is that you have created a Frame, say frame1 and instance of fullGUI(In main Method) say frame2, these are two different frames. In the Constructor you have added those controls to the frame2 (add()==this.add()) and said frame1.setvisible(true);
Adding controls to one frame and displaying altogether different frame is the reason why you were unable to see anything on output scree though you would have maximized the screen.