Table of Contents

1 JList

与ComboBox不同的是JList把所有的可选项都可见，而ComboBox把所有Item隐藏等待用户下拉后才看见。

原型是JList<E>，是个容器，

2 构造函数

 

JList()Constructs a JList with an empty, read-only, model.JList(E[] listData)Constructs a JList that displays the elements in the specified array.JList(ListModel
       
         dataModel)Constructs a JList that displays elements from the specified, non-null, model.JList(Vector
         listData)Constructs a JList that displays the elements in the specified Vector.
       

3 ListMode

This interface defines the methods components like JList use to get the value of each cell in a list and the length of the list. Logically the model is a vector, indices vary from 0 to ListDataModel.getSize() - 1.

3.1 DefaultListMode

 

3.1.1 addElement(E element)

添加元素

3.1.2 add(int index, E element)

在指定位置插入指定元素。

4 JList 几个函数

 

4.1 getSelectedValues()

获取所选元素的值

4.2 getSelectedIndices()

获取所选元素的索引

5 addListSelectionListener(ListSelectionListener)

 

5.1 ListSelectionListener

有Item选中时发生事件

5.2 valueChanged(ListSelectionEvent e)

 

6 程序示例

 

package xjtu.vf.swing;import java.awt.Color;import java.awt.FlowLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.BorderFactory;import javax.swing.DefaultListModel;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JTextArea;import javax.swing.border.Border;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;public class List extends JFrame {    private String[] flavors = { "A", "B", "C", "D", "E", "F" };    private DefaultListModel lItems = new DefaultListModel();    private JList lst = new JList(lItems);    private JTextArea t = new JTextArea(flavors.length, 20);    private JButton b = new JButton("Add Item");    private ActionListener bl = new ActionListener() {        public void actionPerformed(ActionEvent e) {            if (count < flavors.length)                lItems.add(0, flavors[count++]);            else                b.setEnabled(false);        }    };    private ListSelectionListener lsl = new ListSelectionListener() {        @SuppressWarnings("deprecation")        public void valueChanged(ListSelectionEvent e) {            if (e.getValueIsAdjusting())                return;            t.setText("");            for (Object item : lst.getSelectedValues())                t.append(item + "\n");        }    };    private int count = 0;    public List() {        t.setEditable(true);        setLayout(new FlowLayout());        Border brd = BorderFactory.createMatteBorder(1, 1, 2, 2, Color.black);        lst.setBorder(brd);        t.setBorder(brd);        for (int i = 0; i < 4; i++)            lItems.addElement(flavors[count++]);        add(t);        add(lst);        add(b);        b.addActionListener(bl);        lst.addListSelectionListener(lsl);    }    public static void main(String[] args) {        SwingConsole.run(new List(), 250, 375);    }}

Author: visaya fan

Date: 2011-11-20 23:49:33

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