CODEWITHSUNDEEP
javaswingjpanel
isaace
isaace

Reputation: 3429

cannot see JPanel

I am wondering why I am not able to see the topPanel in my controlPanel

Here is my code:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class GUI {

private JFrame frame;
private JTextArea textArea;
private JPanel topPanel;
private JPanel controlPanel;
private JLabel topLabel;

void createScreen() {

    frame = new JFrame("Hello");
    frame.setSize(600,600);
    frame.setLayout(new GridLayout(3,1)); 
    controlPanel = new JPanel();
    controlPanel.setLayout(new FlowLayout());
    controlPanel.setBackground(Color.GREEN);
    topLabel = new JLabel("WELCOME TO MY TRAINING", JLabel.CENTER);

    frame.add(topLabel);
    frame.add(controlPanel);

    topPanel = new JPanel();

    BorderLayout borderLayout = new BorderLayout();

    borderLayout.setHgap(10);
    borderLayout.setVgap(10);

    topPanel.setLayout(borderLayout);
    topPanel.setBackground(Color.BLUE);
    topPanel.setSize(75,300);
    textArea = new JTextArea();
    textArea.setSize(25, 25);

    topPanel.add(textArea, BorderLayout.CENTER);

    controlPanel.add(topPanel);

    frame.setVisible(true);

}

public static void main(String[] args) {
     GUI gui = new GUI();
     gui.createScreen();
}

}

Upvotes: 0

Views: 97

Answers (1)

tsolakp
tsolakp

Reputation: 5948

FlowLayout uses components preferred size and not the actual size set to it. To fix your issue set preferred size to topPanel instead of its size.

topPanel.setPreferredSize( new Dimension(75,300) );

But my advice is to avoid setting size like this but instead let the TextArea determine the size by specifying its number of rows and columns like this:

topPanel.setLayout(borderLayout);
topPanel.setBackground(Color.BLUE);
textArea = new JTextArea(10, 15);

Upvotes: 1

Related Questions