GridBagLayout不起作用

Question

我有一些代码生成以下内容：

我希望3、4和5个JTextFields在JLabels旁边，就像1和2一样。我的代码是尝试这样做，但上面的图像是结果。

有人能指出我代码中的问题吗？

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JTextField;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

 public class example{  
       public static void main(String[] args){

        JDialog jd = new JDialog();
    jd.setTitle("Example");
    GridBagLayout gl = new GridBagLayout();
    final JTextField j1 = new JTextField("1");
    final JTextField j2 = new JTextField("2");
    final JTextField j3 = new JTextField("3");
    final JTextField j4 = new JTextField("4");
    final JTextField j5 = new JTextField("5");
    jd.setLayout(gl);
    GridBagConstraints c = new GridBagConstraints();
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 1.0;
    c.weighty = 1.0;
    c.gridx = 0;
    c.gridy = 0;
    jd.add(new JLabel("TextField 1: "), c);
    c.gridx = 1;
    jd.add(j1,c);
    c.gridx = 0;
    c.gridy++;
    jd.add(new JLabel("TextField 2: "), c);
    c.gridx = 1;
    c.gridy=1;
    jd.add(j2,c);
    c.gridx = 0;
    c.gridy++;
    jd.add(new JLabel("TextField 3: "), c);
    c.gridx = 1;
    jd.add(j3);
    c.gridx = 0;
    c.gridy++;
    jd.add(new JLabel("TextField 4: "), c);
    c.gridx = 1;
    jd.add(j4);
    c.gridx = 0;
    c.gridy++;
    jd.add(new JLabel("TextField 5: "), c);
    c.gridx = 1;
    jd.add(j5);


    jd.pack();
    jd.setVisible(true);
       }
 } 

Answer 1

jd.add(j3);    // **** here
c.gridx = 0;
c.gridy++;
jd.add(new JLabel("TextField 4: "), c);
c.gridx = 1;
jd.add(j4);    // **** here
c.gridx = 0;
c.gridy++;
jd.add(new JLabel("TextField 5: "), c);
c.gridx = 1;
jd.add(j5);    // **** here

您没有在几个add(...)方法调用中使用GridBagConstraints。如果您不告诉GridBagLayout如何放置组件，那么它将无法工作，解决方案正如您所期望的那样，在使用GBL的容器中添加组件时使用constraints对象。