Java：表单布局参数的解释

Question

我在我的一个类中定义了以下摆动布局，我无法理解发生了什么。

private void initComponents() 
    { 
     locationPanel = new JPanel(); 
     label1 = new JLabel(); 
     lastUpdateLabel = new JLabel(); 
     label2 = new JLabel(); 
     accuracyLabel = new JLabel(); 
     batteryPanel = new JPanel(); 
     batteryLabel = new JLabel(); 
     label3 = new JLabel(); 
     cc = new CellConstraints(); 

     setLayout(new FormLayout("default", "default")); 

     locationPanel.setBorder(new TitledBorder("Info")); 
     locationPanel.setLayout(new FormLayout("right:pref, 6dlu, 50dlu, 4dlu, default", "pref, 3dlu, pref, 3dlu, pref")); 


     label1.setText("Last Update:"); 
     locationPanel.add(label1, cc.xy(1, 1)); 

     lastUpdateLabel.setText("Unknown"); 
     locationPanel.add(lastUpdateLabel, cc.xy(3, 1)); 


     label2.setText("Accuracy:"); 
     locationPanel.add(label2, cc.xy(1, 3)); 

     // ---- accuracyLabel ---- 
     accuracyLabel.setText("Unknown"); 
     locationPanel.add(accuracyLabel, cc.xy(3, 3)); 

     label3.setText("Battery Level"); 
     locationPanel.add(label3, cc.xy(1, 5)); 


     batteryLabel.setText("Unknown"); 
     locationPanel.add(batteryLabel, cc.xy(3, 5)); 

     add(locationPanel, cc.xy(1, 1)); 
    } 

问题：我觉得它的说法应该是3行2列？定义了多少行和列;我将如何制作4 x 2布局？我如何确定这是什么话locationPanel.setLayout(new FormLayout("right:pref, 6dlu, 50dlu, 4dlu, default", "pref, 3dlu, pref, 3dlu, pref"));

Answer 1

http://www.java2s.com/Code/Java/Swing-Components/FormLayoutExplicitAlignmentExample3.htm

你布局有5列3行。你可以从例子中得出这个结论。