java.lang.Threadを用いた処理について

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;



public class Test {



	public static void main(String[] args) throws Exception {

		final Process p = Runtime.getRuntime().exec("java aaaa");



		Thread t1 = new Thread() {

			@Override

			public void run() {

				InputStream in = p.getErrorStream();

				InputStreamReader r = new InputStreamReader(in);

				int c;

				try {

					while ((c = r.read()) > -1) {

						System.err.print((char) c);

					}

				} catch (IOException e) {

				}

			}

		};



		Thread t2 = new Thread() {

			@Override

			public void run() {

				InputStream in = p.getInputStream();

				InputStreamReader r = new InputStreamReader(in);

				int c;

				try {

					while ((c = r.read()) > -1) {

						System.out.print((char) c);

					}

				} catch (IOException e) {

				}

			}

		};



		t1.start();

		t2.start();

		t1.join();

		t2.join();



		System.out.println(p.waitFor());

	}

}