无法从 jComboBox 向 jTable 添加行

Question

我有 jComboBox 和 jTable 我写了下面的代码 jComboBoxKeyTyped 从 jComboBox 个所选项目中添加行。

import java.awt.event.KeyEvent;
import javax.swing.table.DefaultTableModel;

public class NewJFrame extends javax.swing.JFrame {


    public NewJFrame() {
        initComponents();
    }


    @SuppressWarnings("unchecked")
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jTable = new javax.swing.JTable();
        jComboBox = new javax.swing.JComboBox<>();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(jTable);
        jComboBox.setEditable(true);
        jComboBox.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
        jComboBox.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyTyped(java.awt.event.KeyEvent evt) {
                jComboBoxKeyTyped(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, 452, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addComponent(jComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 236, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
        setLocationRelativeTo(null);
    }

    private void jComboBoxKeyTyped(java.awt.event.KeyEvent evt) {                                   
        DefaultTableModel df = (DefaultTableModel) jTable.getModel();
        String name = (String) jComboBox.getSelectedItem();
        if ((jComboBox.getSelectedItem().equals(name)) && evt.getKeyCode() == KeyEvent.VK_ENTER) {
            df.addRow(new Object[]{(jComboBox.getSelectedItem())});
        }
    }                                  
    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    private javax.swing.JComboBox<String> jComboBox;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable;
}

如果用户键入所需的名称并按回车键，则必须将其添加到 jtable 但它不会添加一行。

I consider that event is cause,
Usually we first select Item from jComboBox and then coding on
event for example jButton.
So here I want event on jComboBox that consider selected item to be added to jTable.

那么我必须在哪个事件上编写代码或以其他方式处理？

Answer 1

似乎JComboBox 不支持关键侦听器(addKeyListener)。但是我可以使用 addActionListener() 向 table 添加行。但是我们需要使用事件的actionCommand过滤事件。

当用户 select 从下拉列表中选择一个项目时，ActionEvent 被 actionCommand="comboBoxChanged" 触发。当用户按下 Enter 键时，actionCommand="comboBoxEdited".

jComboBox.addActionListener(new ActionListener() {
  @Override
  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand().equals("comboBoxEdited")) {
      DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
      tableModel.addRow(new Object[]{(jComboBox.getSelectedItem())});
    }
  }
});

无法从 jComboBox 向 jTable 添加行

Can not add row to jTable from jComboBox

java

swing

jcombobox