import java.lang.Process ;
import java.io.* ;
import java.util.Scanner ;

public class Test
{
    public static void main(String args[])throws IOException
    {
        Process p = Runtime.getRuntime().exec("java ReadStandard") ;
        try
        (
            PrintStream ps = new PrintStream(p.getOutputStream()); 
        ){
            ps.print("普通字符串普通字符串") ;
            ps.print(new Test()) ;
        }
    }
}

class ReadStandard
{
    public static void main(String args[])
    {
        try
        (
            Scanner sc = new Scanner(System.in) ;
            PrintStream ps = new PrintStream(new FileOutputStream("OUT.txt")) ;
        ){
            sc.useDelimiter("普通") ;
            while(sc.hasNext())
            {
                ps.println("键盘输入的内容为" + sc.next()) ;
            }
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace() ;
        }
    }
}

这里面"p.getOutputStream()"获取的是输出流,这个输出流指的是ReadStandard类的那个输出流?我想了好久没想通这个输出流在哪?而且输出流怎么和子进程ReadStandard进行通信的?