解决下拉列表的连带事件---1_为什么下拉单元格一直连带旁边的-优快云博客

本文介绍了一个使用 Java Swing 实现的简单示例，该示例展示了如何创建并初始化三个组合框，并通过监听器实现对当前日期的自动选择。此外，还介绍了如何根据用户的操作来改变组合框的选择。

package jcomboxchange;

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.*;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import java.awt.event.ItemListener;
import java.util.Calendar;

/**
* Title: 
*
* Description: 
*
* Copyright: Copyright (c) 2007
*
* Company: 
*
* @author not attributable
* @version 1.0
*/
public class JComboxChangeFrame extends JFrame implements Runnable {
 JPanel contentPane;
 Object[] defObjOne = {"2011","2010","2009","2008", "2007", "2006", "2005", "2004", "2003",
 "2002", "2001", "2000"};
 Object[] defObjThere = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
 "11", "12", "13", "14", "15", "16", "17", "18", "19",
 "20",
 "21", "22", "23", "24", "25", "26", "27", "28"};
 Object[] defObjTwo = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
 "11", "12"};
 DefaultComboBoxModel defaultComOne = new DefaultComboBoxModel(defObjOne);

DefaultComboBoxModel defaultComTwo = new DefaultComboBoxModel(defObjTwo);

DefaultComboBoxModel defaultComThere = new DefaultComboBoxModel(defObjThere);

    JComboBox jComboBox1 = new JComboBox();
    JComboBox jComboBox2 = new JComboBox();
    JComboBox jComboBox3 = new JComboBox();
    public JComboxChangeFrame() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(null);
        setSize(new Dimension(548, 374));
        setTitle("下拉列表操作");
        jComboBox1.setBounds(new Rectangle(35, 69, 136, 33));
        jComboBox1.addActionListener(new
                                     JComboxChangeFrame_jComboBox1_actionAdapter(this));
        jComboBox2.setBounds(new Rectangle(34, 123, 137, 37));
        jComboBox2.addActionListener(new
                                     JComboxChangeFrame_jComboBox2_actionAdapter(this));
        jComboBox3.setBounds(new Rectangle(34, 182, 136, 40));
        jComboBox3.addActionListener(new
                                     JComboxChangeFrame_jComboBox3_actionAdapter(this));
        jComboBox1.setModel(defaultComOne);
        jComboBox2.setModel(defaultComTwo);
        jComboBox3.setModel(defaultComThere);
        contentPane.add(jComboBox1);
        contentPane.add(jComboBox2);
        contentPane.add(jComboBox3);
        Thread thr = new Thread(this);
        thr.start();
    }

    public void jComboBox1_actionPerformed(ActionEvent e) {
        jComboBox2.setSelectedItem("2");
    }

    public void jComboBox2_actionPerformed(ActionEvent e) {
        jComboBox3.setSelectedItem("26");
    }

    public void jComboBox3_actionPerformed(ActionEvent e) {
        System.out.println("jComboBox3_actionPerformed");
    }

public void run() {

Calendar date = Calendar.getInstance();
 String year = String.valueOf(date.get(Calendar.YEAR));
 String month = String.valueOf(date.get(Calendar.MONTH)+1);
 String day = String.valueOf(date.get(Calendar.DATE));
 //defaultComOne.get
 //defaultComOne.get
 int tempComOne = defaultComOne.getSize();
 int tempComTwo = defaultComTwo.getSize();
 int tempComThere = defaultComThere.getSize();
 //String selectCom = defaultComOne.getSelectedItem().toString();
 for (int i = 0; i < tempComOne; i++) {
 String selectCom = defaultComOne.getElementAt(i).toString();
 if (year.equals(selectCom.trim())) {
 jComboBox1.setSelectedItem(selectCom); // defaulComOne.getSize()
 }
 }

 for (int i = 0; i < tempComTwo; i++) {
 String selectCom = defaultComTwo.getElementAt(i).toString();
 if (month.equals(selectCom.trim())) {
 jComboBox2.setSelectedItem(selectCom); // defaulComOne.getSize()
 }
 }

 for (int i = 0; i < tempComThere; i++) {
 String selectCom = defaultComThere.getElementAt(i).toString();
 System.out.println(selectCom);
 if (day.equals(selectCom.trim())) {
 jComboBox3.setSelectedItem(selectCom); // defaulComOne.getSize()
 }
 }

}
}

class JComboxChangeFrame_jComboBox1_actionAdapter implements ActionListener {
    private JComboxChangeFrame adaptee;
    JComboxChangeFrame_jComboBox1_actionAdapter(JComboxChangeFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jComboBox1_actionPerformed(e);
    }
}

class JComboxChangeFrame_jComboBox2_actionAdapter implements ActionListener {
    private JComboxChangeFrame adaptee;
    JComboxChangeFrame_jComboBox2_actionAdapter(JComboxChangeFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jComboBox2_actionPerformed(e);
    }
}

class JComboxChangeFrame_jComboBox3_actionAdapter implements ActionListener {
    private JComboxChangeFrame adaptee;
    JComboxChangeFrame_jComboBox3_actionAdapter(JComboxChangeFrame adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        adaptee.jComboBox3_actionPerformed(e);
    }
}