单击windowmaximize按钮最大化JFrame组件

Question

我使用windobuilder pro插件在eclipse中构建了一个jframe 现在，我希望当我最大化jframe时，包含它的textarea和面板也会最大化 这是代码：

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextArea;
import javax.swing.border.TitledBorder;

public class as extends JFrame {

    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    as frame = new as();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public as() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JPanel panel = new JPanel();
        panel.setBorder(new TitledBorder(null, "JPanel title", TitledBorder.LEADING, TitledBorder.TOP, null, null));
        panel.setBounds(92, 62, 168, 122);
        contentPane.add(panel);
        panel.setLayout(null);

        JTextArea textArea = new JTextArea();
        textArea.setBounds(6, 20, 156, 95);
        panel.add(textArea);
    }
}