I want to put a Jbutton on a particular coordinate in a JFrame. I put setBounds for the JPanel (which I placed on the JFrame) and also setBounds for the JButton. However, they dont seem to function as expected.
My Output:
This is my code:
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Control extends JFrame {
// JPanel
JPanel pnlButton = new JPanel();
// Buttons
JButton btnAddFlight = new JButton("Add Flight");
public Control() {
// FlightInfo setbounds
btnAddFlight.setBounds(60, 400, 220, 30);
// JPanel bounds
pnlButton.setBounds(800, 800, 200, 100);
// Adding to JFrame
pnlButton.add(btnAddFlight);
add(pnlButton);
// JFrame properties
setSize(400, 400);
setBackground(Color.BLACK);
setTitle("Air Traffic Control");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
new Control();
}
}
How can place the JButton
at coordinate (0, 0)?
Following line should be called before you add your component
pnlButton.setLayout(null);
Above will set your content panel to use absolute layout. This means you'd always have to set your component's bounds explicitly by using setBounds
method.
In general I wouldn't recommend using absolute layout.
I have figured it out lol. for the button do .setBounds(0, 0, 220, 30) The .setBounds layout is like this (int x, int y, int width, int height)
Use child.setLocation(0, 0)
on the button, and parent.setLayout(null)
. Instead of using setBounds(...) on the JFrame to size it, consider using just setSize(...)
and letting the OS position the frame.
//JPanel
JPanel pnlButton = new JPanel();
//Buttons
JButton btnAddFlight = new JButton("Add Flight");
public Control() {
//JFrame layout
this.setLayout(null);
//JPanel layout
pnlButton.setLayout(null);
//Adding to JFrame
pnlButton.add(btnAddFlight);
add(pnlButton);
// postioning
pnlButton.setLocation(0,0);
Define somewhere the consts :
private static final int BUTTON_LOCATION_X = 300; // location x
private static final int BUTTON_LOCATION_Y = 50; // location y
private static final int BUTTON_SIZE_X = 140; // size height
private static final int BUTTON_SIZE_Y = 50; // size width
and then below :
JButton startButton = new JButton("Click Me To Start!");
// startButton.setBounds(300, 50,140, 50 );
startButton.setBounds(BUTTON_LOCATION_X
, BUTTON_LOCATION_Y,
BUTTON_SIZE_X,
BUTTON_SIZE_Y );
contentPane.add(startButton);
where contentPane
is the Container
object that holds the entire frame :
JFrame frame = new JFrame("Some name goes here");
Container contentPane = frame.getContentPane();
I hope this helps , works great for me ...
You should set layout first by syntax pnlButton.setLayout()
, and then choose the most suitable layout which u want. Ex: pnlButton.setLayout(new FlowLayout(FlowLayout.LEADING, 5, 5));
. And then, take that JButton into JPanel.
First, remember your JPanel size height and size width, then observe: JButton coordinates is (xo, yo, x length , y length). If your window is 800x600, you just need to write:
JButton.setBounds(0, 500, 100, 100);
You just need to use a coordinate gap to represent the button, and know where the window ends and where the window begins.
Source: Stackoverflow.com