卡片布局中JPanel内的GUI组件不垂直对齐

Question

public class MyFrame extends JFrame {

    MyFrame(int width, int height, String title){
        setTitle(title);
        setSize(width, height);
        JPanel internalJP1 = new JPanel(new GridLayout(5,1));
        JLabel hobby = new JLabel("Enter your hobbies:");
        JCheckBox cricket = new JCheckBox("Cricket");
        JCheckBox music = new JCheckBox("Music");
        JCheckBox drawing = new JCheckBox("Drawing");
        JCheckBox dancing = new JCheckBox("Dancing");
        JCheckBox other = new JCheckBox("Other");

        internalJP1.add(hobby);
        internalJP1.add(cricket);
        internalJP1.add(music);
        internalJP1.add(drawing);
        internalJP1.add(dancing);
        internalJP1.add(other);

        JPanel internalJP2 = new JPanel(new GridLayout(4,1));
        JLabel payment = new JLabel("Payment by:");
        ButtonGroup buttonGroup = new ButtonGroup();
        JRadioButton cheque = new JRadioButton("Cheque", false);
        JRadioButton cash = new JRadioButton("Cash", false);
        JRadioButton debitCard = new JRadioButton("Debit Card", false);
        JRadioButton creditCard = new JRadioButton("Credit Card", false);
        buttonGroup.add(cheque);
        buttonGroup.add(cash);
        buttonGroup.add(debitCard);
        buttonGroup.add(creditCard);

        internalJP2.add(payment);
        internalJP2.add(cheque);
        internalJP2.add(cash);
        internalJP2.add(debitCard);
        internalJP2.add(creditCard);

        Container c = getContentPane();
        CardLayout cl = new CardLayout();
        c.setLayout(cl);
        c.add(internalJP1,"crd1");
        c.add(internalJP2,"crd2");
        cl.show(c,"crd1");
    }
}

public class Jtest {
  public static void main(String[] args) {
      MyFrame frame = new MyFrame(300,200,"FirstFrame");
      frame.setVisible(true);
  }
}

Answer 1

只需更改这行代码（在类MyFrame的构造函数中）

JPanel internalJP1 = new JPanel(new GridLayout(5,1));

对此

JPanel internalJP1 = new JPanel(new GridLayout(0,1));

即用0代替5