Java之线程(匿名内部类)

1 Thread对象

Thread t = new Thread(
				new Thread(){
					@Override
					public void run() {
					
						while(true){
							try {
								Thread.sleep(1000);
							} catch (InterruptedException e) {
								e.printStackTrace();
							}
							System.out.println("1: "+Thread.currentThread().getName());
							System.out.println("2: "+this.getName());
						}						
						
					}
				}
		);
		t.start();		

2 Runnable接口

Thread t2 = new Thread(
				new Runnable(){
					@Override
					public void run() {
						
						while(true){
							try {
								Thread.sleep(1000);
							} catch (InterruptedException e) {
								e.printStackTrace();
							}
							System.out.println("3: "+Thread.currentThread().getName());							
						}						
					}
				}
		);
		t2.start();

下面会执行哪部分代码呢！

//只要重写了run方法,你从构造函数传递进去的线程对象就不会在执行		
		new Thread(new Runnable(){
			
			@Override
			public void run() {
				
				while(true){
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					System.out.println("runnable: "+Thread.currentThread().getName());							
				}						
			}
		}
		){
			
			@Override
			public void run() {
				
				while(true){
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					System.out.println("thread: "+Thread.currentThread().getName());							
				}
				
			}
		}.start();

输出结果如下：

3: Thread-2
1: Thread-1
2: Thread-0
thread: Thread-3

以下代码来自于：JAVA编程思想第四版,说明加了是否加线程的区别!
Counter1 .java没有加线程的表现!

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

public class Counter1 extends Applet {	
	
	private static final long serialVersionUID = 1L;
	private int count = 0;
	private Button onOff = new Button("Toggle"), start = new Button("Start");
	private TextField t = new TextField(10);
	private boolean runFlag = true;

	public void init() {
		add(t);
		start.addActionListener(new StartL());
		add(start);
		onOff.addActionListener(new OnOffL());
		add(onOff);
	}

	@SuppressWarnings("static-access")
	public void go() {
		while (true) {
			try {
				Thread.currentThread().sleep(100);
			} catch (InterruptedException e) {
			}
			if (runFlag)
				t.setText(Integer.toString(count++));

		}
	}

	class StartL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			go();
		}
	}

	class OnOffL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			runFlag = !runFlag;
		}
	}

	public static void main(String[] args) {
		Counter1 applet = new Counter1();
		Frame aFrame = new Frame("Counter1");
		aFrame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		aFrame.add(applet, BorderLayout.CENTER);
		aFrame.setSize(300, 200);
		applet.init();
		applet.start();
		aFrame.setVisible(true);
	}
}

Counter2i.java加了线程结果大不一样了,加了个内部类，它继承了Thread

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

public class Counter2i extends Applet {
	
	private static final long serialVersionUID = 1L;

	private class SeparateSubTask extends Thread {
		int count = 0;
		boolean runFlag = true;

		SeparateSubTask() {
			start();
		}

		public void run() {
			while (true) {
				try {
					sleep(100);
				} catch (InterruptedException e) {
				}
				if (runFlag)
					t.setText(Integer.toString(count++));
			}
		}
	}

	private SeparateSubTask sp = null;
	private TextField t = new TextField(10);
	private Button onOff = new Button("Toggle"), start = new Button("Start");

	public void init() {

		add(t);
		start.addActionListener(new StartL());
		add(start);
		onOff.addActionListener(new OnOffL());
		add(onOff);
	}

	class StartL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (sp == null)
				sp = new SeparateSubTask();
		}
	}

	class OnOffL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (sp != null)
				sp.runFlag = !sp.runFlag; // invertFlag();
		}
	}

	public static void main(String[] args) {
		Counter2i applet = new Counter2i();
		Frame aFrame = new Frame("Counter2i");
		aFrame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		aFrame.add(applet, BorderLayout.CENTER);
		aFrame.setSize(300, 200);
		applet.init();
		applet.start();
		aFrame.setVisible(true);
	}
}

Counter3.java它实现了Runnable接口

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

public class Counter3 extends Applet implements Runnable {
	
	private static final long serialVersionUID = 1L;
	private int count = 0;
	private boolean runFlag = true;
	private Thread selfThread = null;
	private Button onOff = new Button("Toggle"), start = new Button("Start");
	private TextField t = new TextField(10);

	public void init() {
		add(t);
		start.addActionListener(new StartL());
		add(start);
		onOff.addActionListener(new OnOffL());
		add(onOff);
	}

	@SuppressWarnings("static-access")
	public void run() {
		while (true) {
			try {
				selfThread.sleep(100);
			} catch (InterruptedException e) {
			}
			if (runFlag)
				t.setText(Integer.toString(count++));
		}
	}

	class StartL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (selfThread == null) {
				selfThread = new Thread(Counter3.this);
				selfThread.start();
			}
		}
	}

	class OnOffL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			runFlag = !runFlag;
		}
	}

	public static void main(String[] args) {
		Counter3 applet = new Counter3();
		Frame aFrame = new Frame("Counter3");
		aFrame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		aFrame.add(applet, BorderLayout.CENTER);
		aFrame.setSize(300, 200);
		applet.init();
		applet.start();
		aFrame.setVisible(true);
	}
}