java 启动线程三种方式

转自：http://blog.csdn.net/typename/article/details/7212512

1.继承Thread

[java]
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public class java_thread extends Thread{
public static void main(String args[])
{
(new java_thread()).run();
System.out.println("main thread run ");
}
public synchronized void run()
{
System.out.println("sub thread run ");
}

}

public class java_thread extends Thread{
	public static void main(String args[])
	{
		(new java_thread()).run();
		System.out.println("main thread run ");
	}
	public synchronized  void run()
	{
		System.out.println("sub thread run ");
	}

}

2.实现Runnable接口

[cpp]
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public class java_thread implements Runnable{
public static void main(String args[])
{
(new Thread(new java_thread())).start();
System.out.println("main thread run ");
}
public void run()
{
System.out.println("sub thread run ");
}

}

public class java_thread implements Runnable{
	public static void main(String args[])
	{
		(new Thread(new java_thread())).start();
		System.out.println("main thread run ");
	}
	public void run()
	{
		System.out.println("sub thread run ");
	}

}

3.直接在函数体使用

[cpp]
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void java_thread()
{

Thread t = new Thread(new Runnable(){
public void run(){
mSoundPoolMap.put(index, mSoundPool.load(filePath, index));
getThis().LoadMediaComplete();
}});
t.start();
}

void java_thread()
{

     Thread t = new Thread(new Runnable(){
            public void run(){
            mSoundPoolMap.put(index, mSoundPool.load(filePath, index));
            getThis().LoadMediaComplete();
            }});
		t.start();
}

4.比较：
实现Runnable接口优势：

1）适合多个相同的程序代码的线程去处理同一个资源

2）可以避免java中的单继承的限制

3）增加程序的健壮性，代码可以被多个线程共享，代码和数据独立。

继承Thread类优势：

1）可以将线程类抽象出来，当需要使用抽象工厂模式设计时。

2）多线程同步

在函数体使用优势

1）无需继承thread或者实现Runnable，缩小作用域。