Layout (GridBagLayout使用例子)

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

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

/**
* GridBagLayout使用例子 （GridBagLayout是使用最广泛的一种布局）
*
* @author brj
*/
public class TestGridBagLayout extends JFrame {
public TestGridBagLayout() {
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  JPanel panel = (JPanel) getContentPane();
  panel.setLayout(new GridBagLayout());

  GridBagConstraints constraints = new GridBagConstraints();
  constraints.gridx = 0;
  constraints.weightx = 1;
  constraints.insets = new Insets(5, 10, 20, 30);
  constraints.fill = GridBagConstraints.BOTH;
  constraints.anchor = GridBagConstraints.CENTER;
  constraints.ipadx = 100;
  constraints.ipady = 50;
  JButton btn = new JButton("button1");
  panel.add(btn, constraints);

  constraints.gridx = 1;
  constraints.weightx = 0;
  btn = new JButton("button2");
  panel.add(btn, constraints);

  constraints.gridx = 2;
  btn = new JButton("button3");
  panel.add(btn, constraints);

  constraints.gridx = 3;
  btn = new JButton("button4");
  panel.add(btn, constraints);

  constraints.gridx = 0;
  constraints.gridy = 1;
  constraints.gridwidth = 4;
  btn = new JButton("button5");
  panel.add(btn, constraints);

  constraints.gridx = 0;
  constraints.gridy = 2;
  constraints.gridwidth = 3;
  btn = new JButton("button6");
  panel.add(btn, constraints);

  constraints.gridx = 3;
  constraints.gridy = 2;
  constraints.gridwidth = 1;
  btn = new JButton("button7");
  panel.add(btn, constraints);

  constraints.gridx = 0;
  constraints.gridy = 3;
  constraints.weighty = 1;
  constraints.gridwidth = 1;
  constraints.gridheight = 2;
  btn = new JButton("button8");
  panel.add(btn, constraints);

  constraints.gridx = 1;
  constraints.gridy = 3;
  constraints.weighty = 0;
  constraints.gridwidth = 3;
  constraints.gridheight = 1;
  btn = new JButton("button9");
  panel.add(btn, constraints);

  constraints.gridx = 1;
  constraints.gridy = 4;
  btn = new JButton("button10");
  panel.add(btn, constraints);

  pack();
}

public static void main(String[] args) {
  JFrame frame = new TestGridBagLayout();
  frame.setVisible(true);
}

}

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