java swing 中的列表框JList如何在程序中动态的添加和删除元素

package test

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import javax.swing.DefaultListModel

import javax.swing.JButton

import javax.swing.JList

import javax.swing.WindowConstants

public class ListFrame extends javax.swing.JFrame {

private JList jList1

private JButton jButton1

private JButton jButton2

private JList jList2

private DefaultListModel listModel1

private DefaultListModel listModel2

private JButton jButton4

private JButton jButton3

{

//Set Look &Feel

try {

javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel")

} catch(Exception e) {

e.printStackTrace()

}

}

/**

* Auto-generated main method to display this JFrame

*/

public static void main(String[] args) {

ListFrame inst = new ListFrame()

inst.setVisible(true)

}

public ListFrame() {

super()

initGUI()

}

private void initGUI() {

try {

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE)

getContentPane().setLayout(null)

{

listModel1 = new DefaultListModel()

listModel1.addElement("item 1")

listModel1.addElement("item 2")

listModel1.addElement("item 3")

listModel1.addElement("item 4")

listModel1.addElement("item 5")

listModel1.addElement("item 6")

jList1 = new JList(listModel1)

getContentPane().add(jList1)

jList1.setBounds(42, 28, 119, 203)

}

{

listModel2 = new DefaultListModel()

jList2 = new JList(listModel2)

getContentPane().add(jList2)

jList2.setBounds(238, 28, 119, 196)

}

{

jButton1 = new JButton()

getContentPane().add(jButton1)

jButton1.setText(">")

jButton1.setBounds(168, 84, 63, 28)

jButton1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

jButton1ActionPerformed(evt)

}

})

}

{

jButton2 = new JButton()

getContentPane().add(jButton2)

jButton2.setText("<")

jButton2.setBounds(168, 133, 63, 28)

jButton2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

jButton2ActionPerformed(evt)

}

})

}

{

jButton3 = new JButton()

getContentPane().add(jButton3)

jButton3.setText("添加")

jButton3.setBounds(168, 35, 63, 28)

jButton3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

jButton3ActionPerformed(evt)

}

})

}

{

jButton4 = new JButton()

getContentPane().add(jButton4)

jButton4.setText("删除")

jButton4.setBounds(168, 189, 63, 28)

jButton4.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {

jButton4ActionPerformed(evt)

}

})

}

pack()

setSize(400, 300)

setLocationRelativeTo(null)

} catch (Exception e) {

e.printStackTrace()

}

}

/** jList1移动到jList2*/

private void jButton1ActionPerformed(ActionEvent evt) {

if(jList1.getSelectedIndex()!=-1){

listModel2.addElement(jList1.getSelectedValue())

int i=jList1.getSelectedIndex()

listModel1.remove(i)

jList1.setSelectedIndex(i>0? i-1:0)

jList2.setSelectedIndex(listModel2.size()-1)

}

}

/** jList2移动到jList1*/

private void jButton2ActionPerformed(ActionEvent evt) {

if(jList2.getSelectedIndex()!=-1){

listModel1.addElement(jList2.getSelectedValue())

int i=jList2.getSelectedIndex()

listModel2.remove(i)

jList2.setSelectedIndex(i>0? i-1:0)

}

}

/** jList1增加项*/

private void jButton3ActionPerformed(ActionEvent evt) {

listModel1.addElement("new item")

}

/** jList1删除项*/

private void jButton4ActionPerformed(ActionEvent evt) {

if(jList1.getSelectedIndex()!=-1){

listModel1.remove(jList1.getSelectedIndex())

}

}

}

你说的是否是 java .util. Vecotor??

如果是这个的话， Vectory 实现List 接口 所以可以和List 一样用法。

如果是在脚本里面 <%%> 使用get (索引)add（对象） 就好了。

具体看你在什么地方使用。

---