demogridlayout.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package swing;

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

/**
 *
 * @author zhaolin
 */
public class DemoGridLayout extends JFrame {

    public DemoGridLayout() {
        JPanel control = new JPanel();
        final JPanel content = new JPanel();
        content.setLayout(new GridLayout(3, 2));
        final JRadioButton jrb1 = new JRadioButton("3*2");
        jrb1.addItemListener(new ItemListener() {

            public void itemStateChanged(ItemEvent e) {
                if (jrb1.isSelected()) {
                    updateContent(content, 3, 2);
                }
            }
        });
        jrb1.setSelected(true);
        final JRadioButton jrb2 = new JRadioButton("4*3");
        jrb2.addItemListener(new ItemListener() {

            public void itemStateChanged(ItemEvent e) {
                if (jrb2.isSelected()) {
                    updateContent(content, 4, 3);
                }
            }
        });
        ButtonGroup bg = new ButtonGroup();
        bg.add(jrb1);
        bg.add(jrb2);


        control.add(jrb1);
        control.add(jrb2);


        Container c = this.getContentPane();
        c.add(control, "North");
        c.add(content);

        this.pack();
        this.setVisible(true);
    }

    public static void main(String[] args) {
        new DemoGridLayout();
    }

    public static void updateContent(Container c, int row, int col) {
        c.setLayout(new GridLayout(0, col));
        c.removeAll();
        for (int i = 0; i < 5; i++) {
            c.add(new JButton("" + i));
        }
        c.validate();
        c.repaint();

    }
}