如何创建一个comboboxactionListener？

如何创建combobox动作侦听器？ 到目前为止我有以下内容：

myCombo = new JComboBox(); myCombo.addActionListener(); 

我不知道如何继续，似乎它与用于按钮的那个不同。

Answer 1

尝试这个：

  myCombo.addActionListener(new actionListener() { public void actionPerformed(ActionEvent eventSource) { JComboBox combo = (JComboBox) myCombo.getSource(); Object selected = combo.getSelectedItem(); if("whatever...") { } } } ); 

Answer 2

我不确定你的问题在哪里。 但是我有这个伪代码，可以帮助你理解Jcombobox上的actionlistner

 import javax.swing.*; import java.awt.event.*; import java.awt.*; public class ChangeJlableByJComboBox extends JFrame { private static final long serialVersionUID = 1L; public ChangeJlableByJComboBox() { super("TooltipInSwing"); setSize(400, 300); getContentPane().setLayout(new FlowLayout()); final JLabel b1; final JComboBox jb1 = new JComboBox(new String[] { " ", "one", "two", "three" }); b1 = new JLabel("Default Lable"); getContentPane().add(b1); getContentPane().add(jb1); jb1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // setting custom text to JLabel if (jb1.getSelectedItem().toString().equals("one")) b1.setText("Lable one ---"); else if (jb1.getSelectedItem().toString().equals("two")) b1.setText("Lable two ---"); else if (jb1.getSelectedItem().toString().equals("three")) b1.setText("Lable three ---"); else b1.setText("----"); // or Compact version for setting JcomboBox selected item // to JLabel text // b1.setText(jb1.getSelectedItem().toString()); System.out.println(jb1.getSelectedItem().toString()); // you can also make use of following method System.out.println(jb1.getSelectedIndex()); } }); setDefaultCloseOperation(DISPOSE_ON_CLOSE); setVisible(true); } public static void main(String args[]) { new ChangeJlableByJComboBox(); } } 

Answer 3

它应该是相同的只是获取getSelectedValue框中的值