Java Tutorial/Swing/No Layout

Laying Out Components Using Absolute Coordinates

import javax.swing.JButton;
import javax.swing.JPanel;
public class Main {
  public static void main(String[] argv) throws Exception {
    JButton component = new JButton();
    JPanel panel = new JPanel(null);
    component.setBounds(1, 1, 100, 100);
    panel.add(component);
  }
}

No LayoutManager: Absolute positioning

To absolute positioning components, passing null to the setLayout method of a container.

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class NoLayoutTest extends JFrame {
  public static void main(String[] args) {
    JFrame.setDefaultLookAndFeelDecorated(true);
    JFrame frame = new JFrame("NoLayout Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(null);
    JLabel label = new JLabel("First Name:");
    label.setBounds(20, 20, 100, 20);
    JTextField textField = new JTextField();
    textField.setBounds(124, 25, 100, 20);
    frame.add(label);
    frame.add(textField);
    frame.setSize(300, 100);
    frame.setVisible(true);
  }
}

Without layout manager, we position components using absolute values.

import javax.swing.JButton;
import javax.swing.JFrame;
public class Absolute {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setLayout(null);
    JButton ok = new JButton("OK");
    ok.setBounds(50, 150, 80, 25);
    JButton close = new JButton("Close");
    close.setBounds(150, 150, 80, 25);
    f.add(ok);
    f.add(close);
    f.setSize(300, 250);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }
}

Z Order

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ZOrder extends JPanel {
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(new ZOrder());
    f.setSize(400, 300);
    f.setVisible(true);
  }
  public ZOrder() {
    setLayout(null);
    JButton first = new JButton("This button is added first");
    first.setBounds(20, 50, 200, 30);
    add(first);
    JButton second = new JButton("This button is added second");
    second.setBounds(120, 65, 200, 30);
    add(second);
  }
}