Converting OutputStream to String

Question

This is a stupid question, but...How do you convert OutputStream to a String. For example i get output stream by:
OuputStream os = process.getOutputStream();
Now I want to convert that stream into a string. How would I do that? How do I use the write() method? I don't have to write the stream anywhere, I just need it in the form of a string. When i simply use os.toString(), it converts the stream to some encrypted code. I need to convert it so the stream is readable.
Thanks.

Answer 1

import java.io.*;
class PipingDemo {
    public static void main(String[] args) throws Exception {
        final PipedInputStream inPipe = new PipedInputStream();
        PipedOutputStream outPipe = new PipedOutputStream(inPipe);
        OutputStreamWriter osWriter = new OutputStreamWriter(outPipe);
        PrintWriter out = new PrintWriter(osWriter);
        Thread thread = new Thread(new Runnable() {
            public void run() {
                try {
                    BufferedReader in = new BufferedReader(new InputStreamReader(inPipe));
                    String line;
                    StringBuffer output = new StringBuffer();
                    while((line = in.readLine()) != null) {
                        output.append(line);
                        output.append(System.getProperty("line.separator"));
                    in.close();
                    System.out.println(output.toString());
                } catch (IOException e) {
                    e.printStackTrace();
        thread.start();
        out.write("Shama Lama rama rama rama ding dong");
        out.write("\nYou put the ooh mau mau oh oh oh oh");
        out.write("\nBack into my smile, child");
        out.write("\nThat is why (That is why)");
        out.write("\nYou are my sugar dee dee doo");
        out.close();
}