java启动线程的3种方式对比分析

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 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 "); 
  } 
 
} 

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