Line Doesn't center on the screen

[sirlink99]

I am making a simple game and I cant seem to get the line to center. I would like it all to be in a column and centered. I have this line of code that is not centering

JLabel numberOfChangesLabel = new JLabel("" + totalChanges);		
pane.add (new JPanel ().add(numberOfChangesLabel));

this should act like me creating another JPanel and then adding the component to that panel, then adding the component to the main panel. When I do create a new panel then add the component to the panel, then add the panel to the main panel it centers. Why doesnt that line work correctly.

Thanks for any help.

[NormR1]

I have this line of code that is not centering

What layout manager are you using?

[sirlink99]

my main panel is using GridLayout. I have 7 rows and I would like the components in the center which is the reason I am using a new panel. Some rows also have multiple components that I would like to add.

[NormR1]

Please make a simple small program that compiles and executes to show your problem.

[mKorbel]

really 288 posts and again and again with empty question, here is your example, please would be possible to demostate your hidden/secret problem on that

import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import javax.swing.*;
//http://stackoverflow.com/questions/2228735/how-do-i-fade-an-image-in-swing/2234020#2234020
public class AlphaTest extends JPanel implements ActionListener {

    private static final Font FONT = new Font("Serif", Font.PLAIN, 32);
    private static final String STRING = "Mothra alert!";
    private static final float DELTA = -0.1f;
    private static final Timer timer = new Timer(100, null);
    private static final long serialVersionUID = 1L;
    private float alpha = 1f;

    AlphaTest() {
        this.setPreferredSize(new Dimension(256, 96));
        this.setOpaque(true);
        this.setBackground(Color.black);
        timer.setInitialDelay(1000);
        timer.addActionListener(this);
        timer.start();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setFont(FONT);
        int xx = this.getWidth();
        int yy = this.getHeight();
        int w2 = g.getFontMetrics().stringWidth(STRING) / 2;
        int h2 = g.getFontMetrics().getDescent();
        g2d.fillRect(0, 0, xx, yy);
        g2d.setComposite(AlphaComposite.getInstance(
                AlphaComposite.SRC_IN, alpha));
        g2d.setPaint(Color.red);
        g2d.drawString(STRING, xx / 2 - w2, yy / 2 + h2);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        alpha += DELTA;
        if (alpha < 0) {
            alpha = 1;
            timer.restart();
        }
        repaint();
    }

    static public void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setLayout(new GridLayout(0, 1));
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.add(new AlphaTest());
                f.pack();
                f.setVisible(true);
            }
        });
    }
}

[sirlink99]

here is my code:

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;


public class Conv implements ActionListener{

	private JTextField characterChange, characterReplace;
	private char charChange;
	private JLabel numberOfChangesLabel;
	private JLabel currentWord, targetWord, startingWord;
	private String answerWord = "TestWord", originalWord, changedWord;
	private JLabel blank = new JLabel ("  ");
	private int totalChanges = 0;
	
	
	public Conv (){
		JFrame f = new JFrame ("Word Conversion Game");
		
		JPanel pane = new JPanel (new GridLayout (7,1));
		
			targetWord = new JLabel (answerWord);
		
		pane.add (targetWord);
		
			currentWord = new JLabel (changedWord);
		
		pane.add (currentWord);
		
		JPanel charChangePane = new JPanel();
			charChangePane.add(new JLabel ("Character: "));
			characterChange = new JTextField (1);
			charChangePane.add(characterChange);
			charChangePane.add (new JLabel ("Replacement: "));
			characterReplace = new JTextField (1);
			charChangePane.add (characterReplace);
		pane.add (charChangePane);
		
		JPanel p = new JPanel ();
			JButton change = new JButton ("Change");
		p.add (change);
		pane.add (p);
		
		pane.add (new JPanel().add (new JLabel ("Number of Changes: ")));
		
		numberOfChangesLabel = new JLabel("" + totalChanges);
		
		pane.add ((new JPanel ().add(numberOfChangesLabel)));
		
		JPanel resetPanel = new JPanel ();
			JButton reset = new JButton ("Reset");
			startingWord = new JLabel (originalWord);
			resetPanel.add (startingWord);
			resetPanel.add (reset);
		pane.add (resetPanel);	
		
			
		f.add(pane);
		f.pack();
		f.setVisible (true);
	}
	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub		
		Conv c = new Conv ();
	}


	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		
	}

}

it currently does nothing. I am just getting the layout

[NormR1]

Can you explain what you want the GUI to look like?
What is wrong with it now?

[mKorbel]

1/ if is there just 7 JPanels, then you can set LayoutManager for each JPanel separatelly, by defalut is there FlowLayout

JPanel pane = new JPanel (new GridLayout (7,1));
targetWord = new JLabel (answerWord);
pane2.setLayout(new BorderLayout())
pane2.add (targetWord, BorderLayout.CENTER);

etc...

2/ otherwise better would be create separate class for every JPanels

3/ or look for GridBagLayout or MigLaoyut

[sirlink99]

I am not to good at using the grid bag layout which is why I am not using it. The MigLayout seems interesting. My plan was to cut down a line by creating a JPanel with a flow layout in the add statement.

the current layout is like this

TEXT...........
Text...........
.....GROUP.....
....BUTTON.....
TEXT...........
TEXT...........
..TEXT&BUTTON..

I would like it all to be centered.

.....TEXT.....
.....TEXT.....
.....GROUP....
....BUTTON....
.....TEXT.....
.....TEXT.....
..TXT&BUTTON..

My idea was to use the flow layout in each of the cells in the grid to center everything, but this means adding it to a panel so that it keeps its original size.

[hfx642]

Try using...

targetWord = new JLabel (answerWord, JLabel.CENTER);

[sirlink99]

The JLabel.CENTER fixed everything. Thanks