第二篇学习笔记

学习的组件的使用方法是：列表框（JList）

package proj3;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class demoJList {

JFrame mainframe;

Container con;

JButton addbtn,delbtn;

JList orignlist,destlist;

DefaultListModel orignmodel,destmodel;

JScrollPane leftjspane,rightjspane;

JSplitPane basesplitpane;

JPanel pane;

static final String msg[] = {"北京","上海","天津","辽宁","吉林","四川","海南","湖北","广东"};

public demoJList(){

mainframe = new JFrame();

con = mainframe.getContentPane();

orignmodel = new DefaultListModel();

for(int i=0;i<msg.length;i++)

orignmodel.addElement(msg[i]);

orignlist = new JList(orignmodel);

destmodel = new DefaultListModel();

destlist = new JList(destmodel);

leftjspane = new JScrollPane(orignlist);
rightjspane = new JScrollPane(destlist);
basesplitpane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,leftjspane,rightjspane);
con.add(basesplitpane,BorderLayout.CENTER);
addbtn = new JButton("选中");
delbtn = new JButton("撤销");
pane = new JPanel();
pane.add(addbtn);
pane.add(delbtn);
addbtn.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int i;
if(e.getSource()==addbtn){
for(i=0;i<orignmodel.getSize();i++)
if(orignlist.isSelectedIndex(i))
destmodel.addElement(orignmodel.elementAt(i));
for(i--;i>=0;i++)
if(orignlist.isSelectedIndex(i))
orignmodel.removeElementAt(i);
}
}

});
delbtn.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int i;
if(e.getSource()==delbtn){
for(i=0;i<destmodel.getSize();i++)
if(destlist.isSelectedIndex(i))
orignmodel.addElement(destmodel.elementAt(i));
for(i--;i>=0;i--)
if(destlist.isSelectedIndex(i))
destmodel.removeElementAt(i);
}
}

});
con.add(pane,BorderLayout.SOUTH);
mainframe.setSize(300, 300);
mainframe.setVisible(true);
mainframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {
// TODO Auto-generated method stub
new demoJList();
}

}