GridBagLayout格式錯誤。 JTextFields在錯誤的位置

Question

我根本無法讓我的JTextFields正確對齊。現在程序看起來像這樣： 。

現在分配編號正確對齊。然而，Mark JTextfield在7以下開始，並且在最後一個Mark下開始重量JTextField。

現在我想要的是一切正確對齊。在作業1中的含義是在同一行下有標記和重量JTextFields。這應該一路下降到7（或我選擇多少行）。

代碼：

public class test{ 

    private static final Insets normalInsets = new Insets(10,10,0,10); 
    private static final Insets finalInsets = new Insets(10,10,10,10); 





    private static JPanel createMainPanel(){ 
     GridBagConstraints gbc = new GridBagConstraints(); 

     //Adding the JPanels. Panel for instructions 
     JPanel panel = new JPanel(); 
     panel.setLayout(new GridBagLayout()); 

     int gridy = 0; 

     //JLabel for the Instructions 
     JTextArea instructionTextArea = new JTextArea(5, 30); 
     instructionTextArea.setEditable(false); 
     instructionTextArea.setLineWrap(true); 
     instructionTextArea.setWrapStyleWord(true); 

     JScrollPane instructionScrollPane = new JScrollPane(instructionTextArea); 
     addComponent(panel, instructionScrollPane, 0, gridy++, 3, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 

     //JLabels for Assignment 
     JLabel label1 = new JLabel("Assignment"); 
     label1.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, label1, 0, gridy, 1, 1, finalInsets,GridBagConstraints.CENTER,GridBagConstraints.HORIZONTAL); 

     //JLabel for Mark 
     JLabel label2 = new JLabel("Mark"); 
     label2.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, label2, 1, gridy, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 

     //JLabel for Weight. 
     JLabel label3 = new JLabel("Weight"); 
     label3.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, label3, 2, gridy++, 1, 1, finalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 



     //JLabel Number for the number list of assignments at the side. 
     for(int i = 1; i<=7; i++){ 
      String kok = String.valueOf(i); 
     JLabel number = new JLabel(kok); 
     number.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, number, 0, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 
     } 

     //JTextfield for Mark 
     for(int i=0; i<7; i++){ 
     JTextField mark = new JTextField(20); 
     mark.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, mark, 1, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE); 
     } 

     //JTextfield for Weight 
     for(int i=0; i<7; i++){ 
     JTextField weight = new JTextField(20); 
     weight.setHorizontalAlignment(JLabel.CENTER); 
     addComponent(panel, weight, 2, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE); 
     } 

     return panel; 

    } 

    private static void addComponent(Container container, Component component, int gridx, int gridy, int gridwidth, int gridheight, Insets insets, int anchor, int fill){ 
     GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0D,1.0D,anchor,fill,insets,0,0); 
     container.add(component,gbc); 
    } 

    public static void main(String[] args) {  
     JFrame frame = new JFrame(); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.add(createMainPanel()); 
     frame.pack(); 
     frame.setVisible(true); 
     new test(); 
    } 
} 

我是一個可怕的新的Java程序員這樣下去容易，請:)。

UPDATE ~~~~~

After running the `for` loops which add the `JLabels` and `JTextFields`, you will need to reset `gbc.gridy = 1`. This way the loop will start adding components from the top row. 

//JLabel Number for the number list of assignments at the side. 
for(int i = 1; i<=7; i++){ 
    String kok = String.valueOf(i); 
    JLabel number = new JLabel(kok); 
    number.setHorizontalAlignment(JLabel.CENTER); 
    addComponent(panel, number, 0, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 
} 
gbc.gridy = 1; 

//JTextfield for Mark 
for(int i=0; i<7; i++){ 
    JTextField mark = new JTextField(20); 
    mark.setHorizontalAlignment(JLabel.CENTER); 
    gridy = 1; //The code only partly works when I include this 
    addComponent(panel, mark, 1, gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE); 
} 
gbc.gridy = 1; 

這是什麼樣子：

只有重量的JTextField正確對齊。當我不添加'gridy = 1'時，它與我的原始截圖具有相同的格式錯誤。

Answer 1

在運行for循環後添加了JLabels和JTextFields，您將需要重置gbc.gridy = 2。這樣循環將開始從頂行添加組件。另外，在每次使用addComponent()時，將gridy++更改爲gbc.gridy++。

gbc.gridy = 2; 

//JLabel Number for the number list of assignments at the side. 
for(int i = 1; i<=7; i++){ 
    String kok = String.valueOf(i); 
    JLabel number = new JLabel(kok); 
    number.setHorizontalAlignment(JLabel.CENTER); 
    addComponent(panel, number, 0, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL); 
} 
gbc.gridy = 2; 

//JTextfield for Mark 
for(int i=0; i<7; i++){ 
    JTextField mark = new JTextField(20); 
    addComponent(panel, mark, 1, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE); 
} 
gbc.gridy = 2; 

//JTextfield for Weight 
for(int i=0; i<7; i++){ 
    JTextField weight = new JTextField(20); 
    weight.setHorizontalAlignment(JLabel.CENTER); 
    addComponent(panel, weight, 2, gbc.gridy++, 1, 1, normalInsets, GridBagConstraints.CENTER,GridBagConstraints.NONE); 
} 

這是結果是什麼樣子：