此程式的用途是當按下上方的按鈕，在底下 JPanel 容器內增加一個 JLabel 元件。我測試過當按下按鈕時，JPanel 容器是會增加一個JLabel 元件，但要看到此 JLabel 元件須要改變視窗的大小。請各位大大幫忙一下…，如何按下按鈕時，立即能在下方JPanel 看到 JLabel 元件，謝謝。 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ShowJLabel extends JFrame{ JButton button = new JButton("秀一下"); JPanel panel = new JPanel(); Container content; public ShowJLabel(){ super("Frame Title"); content = this.getContentPane(); content.setLayout(null); button.setBounds(10,10,100,30); button.addActionListener(new ShowJLabel_button_actionAdapter(this)); content.add(button); panel.setBounds(0,45,120,80); panel.setBorder(BorderFactory.createRaisedBevelBorder()); content.add(panel); this.setSize(new Dimension(130,170)); setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE); } public void button_actionPerformed(ActionEvent e){ panel.add(new Label("我秀我秀!!")); } public static void main(String args[]){ new ShowJLabel(); } } class ShowJLabel_button_actionAdapter implements java.awt.event.ActionListener{ ShowJLabel SJL; ShowJLabel_button_actionAdapter(ShowJLabel SJL){ this.SJL = SJL; } public void actionPerformed(ActionEvent e){ SJL.button_actionPerformed(e); } }

public void button_actionPerformed(ActionEvent e){ panel.add(new Label("我秀我秀!!")); panel.repaint(); panle.validate(); }