nodeframe.java

Java多线程例子 为你提供一个JAVA多线程的实例

/*
 * Created on 2005-9-3
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package com.apollo.thread.example;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.Timer;

public class NodeFrame extends JFrame {

	private final Node node;
	private static Point location = new Point(0,0);
	private static final Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
	
	public NodeFrame(Node node){
		this.node = node;

		Container container = this.getContentPane();
		container.setLayout(new BorderLayout());
		
		container.add(new JLabel("处理 " + this.node + " 节点"), BorderLayout.NORTH);
		container.add(new JLabel("随机值为：" + this.node.getData()), BorderLayout.SOUTH);
		
		final JTextField msg = new JTextField("开始处理！");
		msg.setEditable(false);
		msg.setBackground(Color.ORANGE);
		container.add(msg, BorderLayout.CENTER);

		ActionListener timeListener = new ActionListener(){
			int i = 0;
			public void actionPerformed(ActionEvent e) {
				i++;
				msg.setText("已完成 " + i + "%");
				if (i==100) {
					((Timer)e.getSource()).stop();
					synchronized (NodeFrame.this.node) {
						msg.setBackground(Color.BLUE);
						msg.setForeground(Color.WHITE);
						msg.setText("数据接收完毕！");
						NodeFrame.this.node.notify();
					}
				}
			}
		};
		int delay = ((this.node.getData() * 100) % 300) + 1;
		Timer t = new Timer(delay,timeListener);
		t.start();
		
		this.setTitle("线程名：" + Thread.currentThread().getName());
		this.setSize(100,100);
		synchronized (location) {
			this.setLocation(location);
			//把这句放在同步块以外会导致窗口重叠！
			//注：把有关联性、有原子性的一组代码放在同步块中，但不要什么语句都向里面放，这样
			//　　会无谓的加长对象锁定的时间，影响多线程的效率！
			nextLocation();	
		}		
		
		this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		this.show();
	}
	
	/**
	 * 算出下一个NodeFrame的Location值
	 * 注：如果不加synchronized将会随机出现NodeFrame叠加在一起的情况
	 */
	private static synchronized void nextLocation(){
		if (location.x + 123*2 >= screenSize.width){
			location.x = 0;
			location.y += 100;
		}else{
			location.x += 123;
		}
	}
}