Java线程的联合用法实例分析

public class ThreadJoin
{
  public static void main( String[] args )
  {
    ThreadTest t = new ThreadTest();
    Thread pp = new Thread( t );
    pp.start();
    int flag = 0;
    for( int i = 0; i < 5; ++i )
    {
      if( flag == 3 )
      {
        try
        {
          pp.join();    // 强制运行完pp线程后，再运行后面的程序
        }
        catch( Exception e ) // 会抛出InterruptedException
        {
          System.out.println( e.getMessage() );
        }
      }
      System.out.println( "main Thread " + flag );
      flag += 1;
    }
  }
}
class ThreadTest implements Runnable
{
  public void run()
  {
    int i = 0;
    for( int x = 0; x < 5; ++x )
    {
      try
      {
        Thread.sleep( 1000 );
      }
      catch( InterruptedException e )
      {
        e.printStackTrace();
      }
      System.out.println( Thread.currentThread().getName() + " ---->> " + i );
      i += 1;
    }
  }
}