java로 프로세스 스트림 리다이렉션이 한박자 밀립니다 ...

package test1;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
 
 
public class test3 {
	public static void main(String[] args){
		Process ps=null;
		Runtime rt=null;
		try{
			rt = Runtime.getRuntime();
			ps=rt.exec("C:\\temp\\test.exe");
			Thread thread1 = new ReceiverThread(ps);
			Thread thread2 = new SenderThread(ps);
			thread1.start();
			thread2.start();
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
}
class SenderThread extends Thread{
	Process ps;
	SenderThread(Process ps){
		this.ps = ps;
	}
	public void run(){
		try{
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			PrintWriter writer = new PrintWriter(ps.getOutputStream());
			String msg=null;
			while(true){
				msg=reader.readLine();
				if(msg==null)
					continue;
				writer.println(msg);
				writer.flush();
			}
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
}
class ReceiverThread extends Thread{
	Process ps;
	ReceiverThread(Process ps){
		this.ps = ps;
	}
	public void run(){
		try{
			BufferedReader reader = new BufferedReader(new InputStreamReader(ps.getInputStream()));
			PrintWriter writer = new PrintWriter(System.out);
			String msg=null;
			while(true){
				msg=reader.readLine();
				if(msg==null)
					continue;
				writer.print(msg);
				writer.flush();
			}
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
	}
}

#include <stdio.h> 
void main(void)
{
	int a;
	printf("Hello J : ");
	scanf("%d",&a);
	printf("print : %d",a);
}

5
Hello J : print : 5

Hello J : 5
print : 5

def main():
    print "start py!\n";
    aaa=input();
    print "hello world",aaa;
 
if __name__ == '__main__':
    main()

3
start py!hello world 3