Java可复用事件处理的设计与实现解析 - 编程入门网
作者 佚名技术
来源 NET编程
浏览
发布时间 2012-06-19
| nt = frame.getContentPane();
JScrollPane scrollPane = new JScrollPane(area);
cont.add(scrollPane,BorderLayout.NORTH);
cont.add(button,BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
}
void setMessage(Object source)
{
if(source.equals(button))
{
index = ++index % params.length;
area.setText(params[index]);
}
}
public static void main(String args[])
{
if(args.length > 1)
{
UIDemo2 two = new UIDemo2(args);
}else{
usage();
}
}
private static void usage(){
System.err.println
("You may excute this program as below:");
System.err.println
("java UIDemo2 params1 params2 ...");
System.exit(-1);
}
}
//SemiReusableActionListener
import java.awt.event.*;
public class SemiReusableActionListener
implements ActionListener
{
private UIDemo2 demo2;
SemiReusableActionListener
(UIDemo2 uiDemo)
{
demo2 = uiDemo;
}
public void actionPerformed
(ActionEvent ae)
{
demo2.setMessage
(ae.getSource());
}
}
//UIDemo3
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.reflect.*;
public class UIDemo3
{
private JFrame frame;
private JButton button1;
private JTextArea area;
private int index = -1;
private String [] params;
private UIDemo3(String args[])
{
params = args;
area = new JTextArea(5,25);
button1 = new JButton
("Click here!");
//setup required information
to use GenericActionListener
String methodName = "setMessage";
Class [] paramTypes =
{java.lang.Object.class};
Object [] methodArgs =
{ button1 };
Class clazz = this.getClass();
try{
Method method =
clazz.getMethod(methodName, paramTypes);
button1.addActionListener(new
ReusableActionListener
(method, this, methodArgs));
}
catch(Exception e){
System.out.println("Could not
find the method:
"+methodName+"\nNow Exiting...");
System.exit(-1);
}
frame = new JFrame
(getClass().getName());
frame.addWindowListener
(new ReusableWindowAdapter());
Container cont =
frame.getContentPane();
JScrollPane scrollPane
= new JScrollPane(area);
cont.add(scrollPane,BorderLayout.NORTH);
cont.add(button1,BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
}
public void setMessage(Object source)
{
if(source.equals(button1))
{
index = ++index % params.length;
area.setText(params[index]);
}
}
public static void main(String args[])
{
if(args.length > 1){
UIDemo3 three = new UIDemo3(args);
}else{
usage();
}
}
private static void usage()
{
System.err.println
("You may excute this program as below:");
System.err.println
("java UIDemo3 params1 params2 ...");
System.exit(-1);
}
}
//ReusableWindowAdapter
import java.awt.*;
import java.awt.event.*;
public class ReusableWindowAdapter
extends WindowAdapter{
public void windowClosing
(WindowEvent we){
Object source = we.getSource();
if(source instanceof Frame)
{
((Frame)source).setVisible(false);
((Frame)source).dispose();
System.exit(0);
}
}
}
|
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