JTextAreas所以，當我添加面板時，面板（包含）之間的間距發生了變化，請參見這張圖片。:D例子當一個按鈕被按下時，第一次addTextArea()被調用。狀態 1 -> 圖中的狀態 2。問題是 panel_buttons 與新添加的WorkDescription( JTextArea) 不太接近。并且當多次按下按鈕時，它們之間的間距會發生變化。按鈕之前做了很大的跳躍，但是有； c.weighty = 0.1 - 0.3跳躍更小。// The panel is placed in the center of a JFrame (BorderLayout)public CONSTRUCTOR {    JPanel panel = new JPanel(new GridBagLayout());    GridBagConstraints c = new GridBagConstraints();    // ...    c.anchor = GridBagConstraints.NORTHWEST;    c.gridx = 0;    c.gridy = 0;    c.weightx = 1;    c.weighty = 1;    c.gridwidth = 1;    c.gridheight = 1;    // this is how everything looks at (first pic) start.    panel.add(panel_buttons, c);   // panel_buttons is at the right place}添加一個新的方法WorkDescription，即a JTextArea：public void addTextArea() {    WorkDescription wd = new WorkDescription(); //WorkDescription extends JPanel    panel.remove(panel_buttons);     c.weighty = 0.25;       // I've messed around with the weighty alot.                            // 0.2-0.25 makes the panel_buttons do the least amout of 'down-jump'    panel.add(wd, c);    if(c.gridy < 3 ) {        c.gridy ++;        c.weighty = 1;        panel.add(panel_buttons, c);    }    panel.revalidate();    panel.repaint();}