Threadの一斉開始(完全同期)について

	public static void main( String[] args ) {
		try {
			for ( int i=0; i<Integer.parseInt( args[0] ); i++ ) {
				HogeThread ht = new HogeThread( Thread.currentThread() );
				ht.start();
			}
			
			System.out.println( "準備OK" );
			BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) );
			in.readLine();
			
			System.out.println( "実行!" );
			Thread.currentThread().yield();
		} catch ( Exception e ) {
			e.printStackTrace();
			
		}
	}