Java图形用户界面之列表框

package test;
import javax.swing.*;
import java.awt.*;
import static net.mindview.util.SwingConsole.*;
public class ListTest1 extends JFrame{
private String[] str = {"Monday","Tuesday","Wednesday","Thursday","Friday","Staturday","Sunday"};
private JList list；public ListTest1()
{
list = new JList(str);
setLayout(new FlowLayout());
add(list);
}
public static void main(String[] args)
{
run(new ListTest1(),200,100);
}
}

DefaultListModel listmodel = new DefaultListModel();
listmodel.addElement(element1);//添加元素
listmodel.clear();//清除全部元素
listmodel.remove(int index);//清除指定位置的元素

package test;
import java.awt.*;import java.awt.event.*;import static net.mindview.util.SwingConsole.*;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class ListTest extends JFrame{
private String[] str = {"Monday","Tuesday","Wednesday","Thursday","Friday","Staturday","Sunday"};
private JButton button1 = new JButton("Add Item"),
button2 = new JButton("Clear Item");
private JTextArea text = new JTextArea(str.length,20);
private DefaultListModel listmodel = new DefaultListModel();
private JList list = new JList(listmodel);
//将列表模型加入JList，列表模型负责完成动态操作，JList负责创建列表以及许多其它工作（如多重选择）。
private int count = 0;
private boolean flag = false;
public ListTest()
{
text.setEditable(false);//只是用来显示，不能编辑
for(int i = 0;i<4;i++)
{
listmodel.addElement(str[count++]);
}
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
if(count<str.length)
{
listmodel.addElement(str[count++]);
}else
{
button1.setEnabled(flag);
flag = true;
}
}
});
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
if(count<str.length)
{
count = 0;//列表重新开始添加元素
listmodel.clear();//列表元素清除
text.setText(null);
}else
{
count = 0;
listmodel.clear();
text.setText(null);
button1.setEnabled(flag);//启动按钮
}
}
});
list.addListSelectionListener(new ListSelectionListener(){
@SuppressWarnings("deprecation")
public void valueChanged(ListSelectionEvent e)
{
if(e.getValueIsAdjusting())
return;
//如果检测到事件在更改，则返回true，后面语句不执行；当更改结束后，则返回false，执行后面语句。 for(Object item : list.getSelectedValuesList())
{
text.append(item + "\n");//List型对象转换为Object
}
//list调用getSelectedValuesList()方法，产生一个字符串数组，内容为被选中的元素名称
}
});
setLayout(new FlowLayout());
Border border = BorderFactory.createMatteBorder(1, 1, 2, 2, Color.RED);//添加边框
list.setBorder(border);//设置边框
text.setBorder(border);
add(button1);
add(button2);
add(new JScrollPane(text));
add(list);
}
public static void main(String[] args) 
{
run(new ListTest(),250,375);
}
}

if(e.getValueIsAdjusting())
return;