如何在swing中动态增组件

如何在swing中动态增加组件呢??

java 代码
这是CPUPanel的组件的代码

package example;

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import com.swtdesigner.SwingResourceManager;

public class CPUPanel extends JPanel {

    /**
     * Create the panel
     */
    public CPUPanel() {
        super();
        setLayout(null);

        final JLabel label = new JLabel();
        label.setIcon(SwingResourceManager.getIcon(CPUPanel.class, "/com/esri/arcgis/beans/TOC/TOCControlIconColor16x16.gif"));
        label.setForeground(new Color(128, 0, 0));
        label.setFont(new Font("宋体", Font.ITALIC, 18));
        label.setBounds(0, 0, 294, 52);
        add(label);
        label.setText("这是谁的哪个牌子的CPU??");

        final JButton button = new JButton();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                setVisible(false);
            }
        });
        button.setText("退出");
        button.setBounds(24, 91, 99, 23);
        add(button);
        //
    }

}

下面是MainBorad的代码,

java 代码

package example;

import java.awt.event.ActionEvent;
import example.CPUPanel;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class MainBoard extends JFrame {

    /**
     * Launch the application
     * @param args
     */
    public static void main(String args[]) {
        try {
            MainBoard frame = new MainBoard();
            frame.setVisible(true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Create the frame
     */
    public MainBoard() {
        super();
        getContentPane().setLayout(null);
        setBounds(100, 100, 500, 375);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JButton button = new JButton();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                final CPUPanel panel = new CPUPanel();
                panel.setBounds(142, 45, 230, 200);
                getContentPane().add(panel);
///////////////////////
                repaint();
            }
        });
        button.setText("CPU的情况");
        button.setBounds(10, 10, 124, 23);
        getContentPane().add(button);

        final JButton button_1 = new JButton();
        button_1.setText("内存的情况");
        button_1.setBounds(179, 10, 99, 23);
        getContentPane().add(button_1);


        //
    }

}

千成要记住要加repaint()方法