Why Is My Jlabel Not Showing Up

JLabel doesn't show up

Set a layout for your panel. Per example :

loginpanel.setLayout(new BorderLayout());

You can learn more about layouts here.

Here's what I get :

JLabel is not showing up?

The reason the label does not show up is that the content pane of a JFrame uses a BorderLayout as its LayoutManager. When you call l.add(me) and then l.add(p) you are effectively replacing the Container instance with the button. Try changing you Container to a JPanel, add both label and button components to that and then add it to your frame's content pane. Read up on Layout Managers, too.

The following example shows a JPanel containing a JLabel and JButton arranged using the JPanel's default LayoutManager of FlowLayout.

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel content = new JPanel();
    content.add(new JLabel("A Label"));
    content.add(new JButton("A Button"));

    frame.add(content);
    frame.pack();
    frame.setVisible(true);

JLabels not showing up

Since you posted a lot of code and I'm not sure what were you trying to achieve, I modified your code adding 3 JLabels at the topPane. And 3 JRadioButtons (I didn't add the ButtonGroup) below on a second JPanel, I commented how to make them appear on a vertical and horizontal align.

Something you should take into account is:

• Don't extend and create objects from JFrame (One or the other, not both, I recommend you to create objects).

• You were giving your JPanel a Layout after adding components to it, it should be done before.

• From the above point, you were also giving your Layout to your JLabel not your JPanel.

• You were adding a JList into a JLabel.

• You missed to have a class constructor too.

• Don't have multiple JFrames for more see The use of multiple JFrames, Good / Bad practice

• Next time post a code which has no dependencies such as your Truck, Car and Motorcycle classes (i.e. a Runnable example). And use plain text instead so we can copy-paste the code and see the issue. Also try posting images (or the link and we can edit to add it).

Now, the outpus of my own program are:

And it was done with the following code.

import javax.swing.*;
import java.awt.*;
public class GUIExample {
    JFrame frame;
    JLabel label1, label2, label3;
    JPanel topPane, radioPane;
    JRadioButton radio1, radio2, radio3;
    public static void main(String[] args) {
        new GUIExample();
    }

    GUIExample () {
        frame = new JFrame();

        topPane = new JPanel();
        radioPane = new JPanel();
        topPane.setLayout(new FlowLayout());
        // radioPane.setLayout(new BoxLayout(radioPane, BoxLayout.PAGE_AXIS)); //Vertical align
        radioPane.setLayout(new FlowLayout()); //Horizontal align

        label1 = new JLabel("Car");
        label2 = new JLabel("Motorcycle");
        label3 = new JLabel("Truck");

        radio1 = new JRadioButton("Radio1");
        radio2 = new JRadioButton("Radio2");
        radio3 = new JRadioButton("Radio3");

        topPane.add(label1);
        topPane.add(label2);
        topPane.add(label3);

        radioPane.add(radio1);
        radioPane.add(radio2);
        radioPane.add(radio3);

        frame.add(topPane, BorderLayout.PAGE_START);
        frame.add(radioPane, BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}

JLabel not showing in JFrame

You are adding Components to an already visible JFrame. Either add the Components before calling setVisible (preferred - you may also want to call pack to lay out the components as well)

add(lbl);
pack();
setVisible(true);

or call revalidate on the JFrame after adding the Component(s)

setVisible(true);
add(lbl);
revalidate();

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