JList的使用实例

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import javax.swing.*;import java.awt.*;import java.awt.event.*;import javax.swing.event.*;public class List implements ListSelectionListener{JList list;public static void main(String [] args){List gui=new List();gui.go();}public void go(){JFrame frame=new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel panel=new JPanel();frame.getContentPane().add(BorderLayout.CENTER,panel);String [] listEntries ={"alpha","beta","gamma","delta","epslion","zeta","eta","theta"};list=new JList(listEntries);JScrollPane scroller=new JScrollPane(list);scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);panel.add(scroller);list.setVisibleRowCount(4);//设定显示的行数list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);//限制用户只能选取一个项目list.addListSelectionListener(this);frame.setSize(300,300);frame.setVisible(true);}public void valueChanged(ListSelectionEvent lse){//如果没有加上这个if测试，你会得到两次的事件if(!lse.getValueIsAdjusting()){String selection=(String)list.getSelectedValue();//这会返回一个Object，不一定是StringSystem.out.println(selection);}}}
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