鼠标点击交换两个list的列表项

最新推荐文章于 2021-11-04 16:20:43 发布

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本文介绍了一个使用 Java AWT 实现的简单 GUI 应用案例，该应用可通过按钮点击或双击列表项来实现两个列表之间的元素交换。此示例展示了如何创建列表、按钮，并为它们添加监听器。

import java.awt.*;
import java.awt.event.*;

public class ListSwitch
{
Frame f = new Frame("鼠标点击交换两个list的列表项");
Panel p1 = new Panel();
Panel p2 = new Panel(new GridLayout(2,1,5,30));
Panel p3 = new Panel();
Button b1 = new Button(">>");
Button b2 = new Button("<<");
List l1 = new List(10);
List l2 = new List(10);

public static void main(String[] args)
{
  ListSwitch ls = new ListSwitch();
  ls.go();
}
void go()
{
  f.setSize(500,400);
  f.setLayout(new FlowLayout());
  f.add(p1);
  f.add(p2);
  f.add(p3);
  l1.add("desk");
  l1.add("computer");
  l1.add("printer");
  l1.add("pen");
  l2.add("blue");
  l2.add("red");
  l2.add("green");
  l2.add("black");
  p1.add(l1);
  p2.add(b1);
  p2.add(b2);
  p3.add(l2);
  b1.addActionListener(new ButtonHandler(l1,l2));
  b2.addActionListener(new ButtonHandler(l2,l1));
  l1.addMouseListener(new MouseHandler(l1,l2));
  l2.addMouseListener(new MouseHandler(l2,l1));
  f.addWindowListener(new WindowHandler());
  f.setVisible(true);
}

class ButtonHandler implements ActionListener
{
  List laa,lbb;
  ButtonHandler(List la,List lb)
  {
   laa = la;
   lbb = lb;
  }
  public void actionPerformed(ActionEvent e)
  {
   String s;
   s = laa.getItem(laa.getSelectedIndex());
   laa.remove(laa.getSelectedIndex());
   lbb.add(s);
  }
}
class MouseHandler extends MouseAdapter
{
  List laa,lbb;
  MouseHandler(List la,List lb)
  {
   laa = la;
   lbb = lb;
  }
  public void mouseClicked(MouseEvent e)
  {
   if (e.getClickCount() == 2)
   {
    String s;
    s = laa.getItem(laa.getSelectedIndex());
    laa.remove(laa.getSelectedIndex());
    lbb.add(s);
   }
  }
}
class WindowHandler extends WindowAdapter
{
  public void windowClosing(WindowEvent e)
  {
   System.exit(1);
  }
}
}