Java的程序中，如何删除jList中选定的项（jList.getSelectedValue()）

实现方法

1、初始化

首先添加JScrollPane的实例jScrollPane1，DefaultListModel

实例model1，然后使用model1生成JList的实例。在对话框合适的位置添加jScrollPane1，调整到合适的大小，然后在jScrollPane1上增加jList1这样带有滚动条的列表框就添加完成了。

初始化一个Vector实例用来存储选择的列表元素。由于选择的元素具有不确定性，所以使用Vector这种存储空间可以动态变化的数据结构。Vector初始化实例时不能指定初始化长度，所以增加一个整形变量指示Vector中列表中对象的个数。

2、添加和删除列表元素

列表框中的元素添加和删除是通过model1的addElement方法和removeElement方法实现的。通过列表框的属性selectionMode可以设置列表框单选，单个间断选择和多个间断选择。Vector中存储的对象是和选择的元素相对应的，对象的添加和删除是通过addElement方法和removeElement方法实现的。

3、获得选择元素

在点击“确定”按钮以后，需要将Vector实例中的对象转化成为需要的数据类型。

实例解析

现以图1所示为例对具体实现方法进行描述。由图1中左面列表框中选择可用元素，选择方式设为多个间断选择，由于其他两种方式相对简单，实现方法可在这个实例的基础上修改得到。选定元素之后，点击“>>”按钮，选择的元素就会在右面的列表框显示出来。如果多选或者错选，可在右面的列表框中选定元素后点击“<<”按钮移去选定的元素。

以上实现的功能代码如下

　图1 列表框示例

具体程序实现方法如下。

import javaxswingJPanel;

import javaxswingJFrame;

import javaxswingJScrollPane;

import javaawtRectangle;

import javautilVector;

import javaxswingJList;

import javaxswingJButton;

import javaxswingDefaultListModel;

public class Llist extends JFrame {

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JScrollPane jScrollPane = null;

private JScrollPane jScrollPane1 = null;

private JList jList = null;

private JList jList1 = null;

private JButton jButton = null;

private JButton jButton1 = null;

private DefaultListModel model;

private DefaultListModel model2;

/

This is the default constructor

/

private Vector vc=new Vector(); // @jve:decl-index=0:

private int num;

public Llist() {

super();

initialize();

}

/

This method initializes this

@return void

/

private void initialize() {

thissetSize(393, 263);

thissetContentPane(getJContentPane());

thissetTitle("JFrame");

}

/

This method initializes jContentPane

@return javaxswingJPanel

/

private JPanel getJContentPane() {

if (jContentPane == null) {

jContentPane = new JPanel();

jContentPanesetLayout(null);

jContentPaneadd(getJScrollPane(), null);

jContentPaneadd(getJScrollPane1(), null);

jContentPaneadd(getJButton(), null);

jContentPaneadd(getJButton1(), null);

jContentPaneadd(getJButton2(), null);

jContentPaneadd(getJButton3(), null);

}

return jContentPane;

}

/

This method initializes jScrollPane

@return javaxswingJScrollPane

/

private JScrollPane getJScrollPane() {

if (jScrollPane == null) {

jScrollPane = new JScrollPane();

jScrollPanesetBounds(new Rectangle(22, 23, 110, 152));

jScrollPanesetViewportView(getJList());

}

return jScrollPane;

}

/

This method initializes jScrollPane1

@return javaxswingJScrollPane

/

private JScrollPane getJScrollPane1() {

if (jScrollPane1 == null) {

jScrollPane1 = new JScrollPane();

jScrollPane1setBounds(new Rectangle(223, 24, 116, 150));

jScrollPane1setViewportView(getJList1());

}

return jScrollPane1;

}

/

This method initializes jList

@return javaxswingJList

/

String[]

a={"Element1","Element2","Element3","Element4","Element5","Element6","Element7","Element8","Element9","Element10",};

private JButton jButton2 = null;

private JButton jButton3 = null;

private JList getJList() {

if (jList == null) {

jList = new JList();

model=new DefaultListModel();

jListsetModel(model);

­

for(int i=0;i<alength;i++)

{

modeladdElement(a[i]);

}

}

return jList;

}

/

This method initializes jList1

@return javaxswingJList

/

­

private JList getJList1() {

if (jList1 == null) {

­

jList1 = new JList();

model2=new DefaultListModel();

jList1setModel(model2);

}

return jList1;

}

/

This method initializes jButton

@return javaxswingJButton

/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButtonsetBounds(new Rectangle(149, 52, 56, 29));

jButtonsetText(">>");

jButtonaddActionListener(new javaawteventActionListener() {

public void actionPerformed(javaawteventActionEvent e) {

//Systemoutprintln("actionPerformed()"); // TODO Auto-generated Event

stub actionPerformed()

­

Object[] items=jListgetSelectedValues();

for(int i=0;i<itemslength;i++)//从左边选中元素，往右边的列表中添加元素

{

model2addElement(items[i]);

num=num+1;

vcsetSize(num);

­

}

}

});

}

return jButton;

}

/

This method initializes jButton1

@return javaxswingJButton

/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1setBounds(new Rectangle(145, 117, 65, 31));

jButton1setText("<<");

jButton1addActionListener(new javaawteventActionListener() {

public void actionPerformed(javaawteventActionEvent e) {

//Systemoutprintln("actionPerformed()"); // TODO Auto-generated Event

stub actionPerformed()

for(int i=0;i<jList1getSelectedValues()length;i++)

{

model2removeElement(jList1getSelectedValue());//删除选中右边的列表元素

num=num-1;

vcsetSize(num);

­

­

}

}

});

}

return jButton1;

}

/

This method initializes jButton2

@return javaxswingJButton

/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton();

jButton2setBounds(new Rectangle(82, 193, 63, 27));

jButton2setText("确定");

jButton2addActionListener(new javaawteventActionListener() {

public void actionPerformed(javaawteventActionEvent e) {

­

}

});

}

return jButton2;

}

/

This method initializes jButton3

@return javaxswingJButton

/

private JButton getJButton3() {

if (jButton3 == null) {

jButton3 = new JButton();

jButton3setBounds(new Rectangle(196, 195, 66, 23));

jButton3setText("取消");

jButton3addActionListener(new javaawteventActionListener() {

public void actionPerformed(javaawteventActionEvent e) {

//Systemoutprintln("actionPerformed()"); // TODO Auto-generated Event

stub actionPerformed()

model2removeAllElements();//删除右边列表框的所有元素

}

});

}

return jButton3;

}

}

import javaawt;

import javaawtevent;

import javaxswing;

public class JlistD {

public JlistD(String title) {

JFrame frame = new JFrame(title);

setLAF(); // 设置风格

framegetContentPane()add(new ListPanel());

init(frame);

}

private void setLAF() {

try {

UIManagersetLookAndFeel(UIManagergetSystemLookAndFeelClassName());

} catch (Exception ignore) {

}

}

public void init(JFrame f) {

fsetAlwaysOnTop(true);

fpack();

fsetDefaultCloseOperation(JFrameDISPOSE_ON_CLOSE);

fsetLocationRelativeTo(null);

fsetVisible(true);

}

public static void main(String[] args) {

new JlistD("JListD");

}

}

class ListPanel extends JPanel {

private DefaultListModel model;

private JList list;

public ListPanel() {

Dimension d = new Dimension(300, 300);

thissetPreferredSize(d);

thissetLayout(new BorderLayout());

addList();

addButtons();

}

private void addList() {

model = new DefaultListModel();

list = new JList(model);

listsetFixedCellHeight(20);

listsetPreferredSize(new Dimension(300, 40));

thisadd(list, BorderLayoutNORTH);

}

private void addButtons() {

JButton limit = new JButton("limit");

JButton reset = new JButton("reset");

JButton clear = new JButton("clear");

JPanel panel = new JPanel();

limitaddActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

listsetPreferredSize(new Dimension(300, 100));

listrevalidate();

}

});

resetaddActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (modelgetSize() == 0) {

String[] items = { "A", "B", "C", "D", "E", "F", "G", "H", "I" };

for (int i = 0; i < itemslength; i++) {

modeladd(i, items[i]);

}

}

listsetPreferredSize(new Dimension(300, 180));

listrevalidate();

}

});

clearaddActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

modelremoveAllElements();

listsetPreferredSize(new Dimension(300, 40));

listrevalidate();

}

});

paneladd(limit);

paneladd(reset);

paneladd(clear);

thisadd(panel, BorderLayoutSOUTH);

}

}

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