如何對齊JSplitPane中的RadioButtons？

Question

我想在我的程序在這裏對齊RadioButtons。有人能幫助我嗎？我不確定如何去做。我在這裏和其他地方搜索，似乎沒有找到一個適用的例子。這是，我相信我的代碼的相關部分。如果需要更多，我會編輯。

final class SplitPanel extends JFrame { 
    private FlowLayout flowLayout = new FlowLayout(); 
    private GridLayout gridLayout = new GridLayout(4, 1); 
    private DiagLayout diagLayout = new DiagLayout(); 

    private JRadioButton jrbFlowLayout = new JRadioButton("Horizontal"); 
    private JRadioButton jrbGridLayout = new JRadioButton("Verticle"); 
    private JRadioButton jrbDiagLayout = new JRadioButton("Diagonal"); 

    private JButton jbt1 = new JButton("Button 1"); 
    private JButton jbt2 = new JButton("Button 2"); 
    private JButton jbt3 = new JButton("Button 3"); 
    private JButton jbt4 = new JButton("Button 4"); 

    private JSplitPane jSplitPane; 
    private JPanel jPanel1, jPanel2; 

    public SplitPanel() { 
     this.setTitle("Split Panel with Diagonalization"); 
     this.setSize(600, 400); 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     createPanel1(); 
     createPanel2(); 

     jSplitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, 
       jPanel1, jPanel2); 
     jSplitPane.setOneTouchExpandable(true); 
     jSplitPane.setContinuousLayout(true); 
     jSplitPane.setDividerLocation(150); 

     getContentPane().add(jSplitPane); 
    } 

    public void createPanel1() { 
     jPanel1 = new JPanel(); 
     jPanel1.setBorder(new TitledBorder("Select a Layout Manger")); 
     jPanel1.add(jrbFlowLayout); 
     jPanel1.add(jrbGridLayout); 
     jPanel1.add(jrbDiagLayout); 

     ButtonGroup buttonGroup1 = new ButtonGroup(); 
     buttonGroup1.add(jrbFlowLayout); 
     buttonGroup1.add(jrbGridLayout); 
     buttonGroup1.add(jrbDiagLayout); 

    } 

    public void createPanel2() { 
     jPanel2 = new JPanel(); 
     jPanel2.setLayout(diagLayout); 
     jPanel2.add(jbt1); 
     jPanel2.add(jbt2); 
     jPanel2.add(jbt3); 
     jPanel2.add(jbt4); 

     jrbFlowLayout.addActionListener (new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       jPanel2.setLayout(flowLayout); 
       jPanel2.validate(); 
      } 
     }); 

     jrbGridLayout.addActionListener (new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       jPanel2.setLayout(gridLayout); 
       jPanel2.validate(); 
      } 
     }); 

     jrbDiagLayout.addActionListener (new ActionListener() { 
      @Override 
      public void actionPerformed(ActionEvent e) { 
       jPanel2.setLayout(diagLayout); 
       jPanel2.validate(); 
      } 
     }); 

    } 

謝謝你的幫忙！

Answer 1

JPanel的默認佈局是FlowLayout。 http://docs.oracle.com/javase/tutorial/uiswing/layout/using.html

您可能希望將面板佈局設置爲GridLayout或BoxLayout。

在

createPanel1(){ 
// create panel. 
jPanel1.setLayout(new GridLayout(0,1)); 

Answer 2

嘗試不同的佈局管理器爲您jPanel1

public void createPanel1() { 
    jPanel1 = new JPanel(); 
    //jPanel1.setLayout(new GridLayout(0, 1); 
    jPanel1.setLayout(new BoxLayout(jPanel1, BoxLayout.Y_AXIS)); 
    jPanel1.setBorder(new TitledBorder("Select a Layout Manger")); 
    jPanel1.add(jrbFlowLayout); 
    jPanel1.add(jrbGridLayout); 
    jPanel1.add(jrbDiagLayout); 

    ButtonGroup buttonGroup1 = new ButtonGroup(); 
    buttonGroup1.add(jrbFlowLayout); 
    buttonGroup1.add(jrbGridLayout); 
    buttonGroup1.add(jrbDiagLayout); 

} 

GridLayout ...

BoxLayout ...

我幾乎會建議GridBagLayout，但是這可能矯枉過正在這種情況下...