如何根据用户需求为JComboBox的动作创建JTextField？

Question

我需要从 JComboBox 的动作动态创建 JTextField 控件，我需要从组合中获取值 box.How 以根据用户需求动态创建文本字段？就像用户需要 10 个文本可以创建通过从组合中获取数据的 10 个文本字段 box.I 我正在尝试此代码，但它不是 working.What 需要更改此代码吗？

 private void memberSelectionActionPerformed(java.awt.event.ActionEvent evt) {        
        int numberOfMember=Integer.valueOf((String)memberSelection.getSelectedItem());

     Object obj=evt.getSource();
     if(obj==memberSelection){

       UserUpdatePanel.setLayout(new GridLayout(7, 2)); // matrixPanel is the dedicated JPanel
     for(int j=0;j<selectedMember;j++){

          JTextField textField = new JTextField();
          UserUpdatePanel.add(textField);    
}
       this.setContentPane(jPanel1);
       this.pack();
       this.setVisible(true);

     } 
}

Answer 1

试试这个：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class SwingTest extends JFrame {

    private final JPanel  userUpdatePanel;
    private final JComboBox<Integer> memberSelection;

    public SwingTest()  {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        memberSelection = new JComboBox<>(new Integer[]{1,2,3,4,19,26});
        memberSelection.addActionListener(e-> memberSelectionActionPerformed());
        add(memberSelection, BorderLayout.PAGE_START);
        userUpdatePanel = new JPanel();
        add(userUpdatePanel);
        pack();
        setVisible(true);
    }

     private void memberSelectionActionPerformed(){
         int numBerOfPanels = (int) memberSelection.getSelectedItem();
         userUpdatePanel.removeAll();
         userUpdatePanel.setLayout(new GridLayout(0,2));
         for(int i =0; i < numBerOfPanels; i++){
              userUpdatePanel.add(new JTextField());
         }
         pack();
     }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(()-> new SwingTest());
    }
}

如何根据用户需求为JComboBox的动作创建JTextField？

How to create JTextField for the action of JComboBox by demand of user?

java

swing

jcombobox