GridBag面板不佔用所有的空間

Question

我想列出標籤行中的列。我正在嘗試使用gridbaglayout，但我遇到了問題。當我展開窗口時，它不會展開。這是發生了什麼：

我真正想要的是它的佈局中的單元格佔用1/5的空間，並將標籤轉移到單元格的左側大部分。

public static JPanel createLayout(int rows) { 
    JPanel product = new JPanel(new GridBagLayout()); 
    String[] lables = {"School", "Advanced #", "Novice #"}; 
    double weight = 1/(lables.length); 
    for (int i = 0; i < rows; i++) { 
     GridBagConstraints c = new GridBagConstraints(); 
     c.insets = new Insets(3, 3, 3, 3); 
     c.anchor = GridBagConstraints.WEST; 
     c.gridx = i; 
     c.weightx = weight; 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.anchor = GridBagConstraints.NORTHWEST; 
     for (int j = 0; j < lables.length; j++) { 

      JLabel l = new JLabel(lables[j]); 
      product.add(l, c); 
     } 
    } 
    return product; 
} 

public static void main(String[] args) throws IOException { 
    JFrame frame = new JFrame("Debate Calculator"); 
    JPanel debates = new JPanel(); 
    frame.add(createLayout(5), BorderLayout.CENTER); 
    frame.pack(); 
    frame.setVisible(true); 
    } 

Answer 1

我相信問題是與你的體重計算...

double weight = 1/(lables.length); 

因爲1和lables.length都是int類型，Java的自動轉換的結果爲int（這是0）。

相反，你可以試試...

double weight = 1d/(double)lables.length;