Positioning a component in the center of other component using GridbagLayout : GridBagLayout « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. GridBagLayout

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Label;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main {
  public static void main(String[] argv) {
    JFrame demo = new JFrame("GridBag demo, to center a component");
    JPanel parentPanel = new JPanel();
    GridBagLayout gridbag = new GridBagLayout();
    GridBagConstraints constraints = new GridBagConstraints();
    constraints.fill = GridBagConstraints.CENTER;
    gridbag.setConstraints(parentPanel, constraints);
    parentPanel.setLayout(gridbag);
    Label centerLabel = new Label(" AAA...");
    parentPanel.add(centerLabel);
    demo.add(parentPanel);
    demo.setSize(500, 500);
    demo.setVisible(true);
  }
}

14.94.GridBagLayout
	14.94.1.	Using a GridBagLayout Manager
	14.94.2.	Uses many features
	14.94.3.	Place a component at cell location (1,1)
	14.94.4.	Setting the Location of a Component in a GridBagLayout
	14.94.5.	Getting the Number of Rows and Columns of Cells in a GridBagLayout
	14.94.6.	Making a GridBagLayout Fill the Container
	14.94.7.	Setting the Stretchyness of Rows and Columns in a GridBagLayout Using Layout Weights
	14.94.8.	Place a component at (0,1) with a column weight 1 and a row weight of 2
	14.94.9.	Setting Stretchyness of a GridBagLayout Using Fill
	14.94.10.	Make the component on stretchable
	14.94.11.	Make the component only stretch horizontally
	14.94.12.	Make the component only stretch vertically
	14.94.13.	Make the component stretch in both directions
	14.94.14.	Setting the Space around a Component Within the Cell of the GridBagLayout Using Insets
	14.94.15.	Create and set a gridbag layout and how to set gridbag constraints
	14.94.16.	Associate the gridbag constraints with the component
	14.94.17.	Positions five components within a container, using weights, fill, and relative positioning
	14.94.18.	Positioning a component in the center of other component using GridbagLayout