[問題] repaint沒能即時印出

[sn153246 (sn153246)]

最近練習GUI

我用按鍵改變panel

可是沒辦法即時印出 要改變frame大小才可以

以下是大概的程式碼

public class DrawPolygon extends JFrame
{
    private PolygonsPanel Poly = new PolygonsPanel(); //呼叫Panel
    class increasePoly implements ActionListener //假設呼叫了這兩個class
        {
            public void actionPerformed(ActionEvent e)
                {
                    Poly.increase();
                }
        }
        class decreasePoly implements ActionListener
        {
            public void actionPerformed(ActionEvent e)
                {
                    Poly.decrease();
                }
        }
}
class PolygonsPanel extends JPanel
{
        private static int times = 5;
        public void increase() //這邊改了times 可是要改frame大小才會重印
        {
            times++;
                repaint();
        }
        public void decrease()
        {
            times--;
                repaint();
        }
        protected void paintComponent(Graphics g) //N邊形的Polygon
        {
                super.paintComponent(g);
        /*  以下不重要 */
        }
}

為什麼不能即時印出來呢?

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◆ From: 123.193.0.248
→ corevalue:validate(); ??
→ sn153246:加過了...沒有效
→ lui:你的PolygonsPanel是直接放在JFrame裡嗎  還是還有一層?
→ sn153246:是另一層，因為我想把times設成靜態
→ sn153246:先謝謝各位的回答，我已經成功了