calcclient.java

Java Thread Programming (Source

import java.io.*;
import java.net.*;

public class CalcClient extends Object {
	public static void main(String[] args) {
		String hostname = "localhost";
		int port = 2001;

		try {
			Socket sock = new Socket(hostname, port);

			DataInputStream in = new DataInputStream(
				new BufferedInputStream(sock.getInputStream()));
			DataOutputStream out = new DataOutputStream(
				new BufferedOutputStream(sock.getOutputStream()));

			double val = 4.0;
			out.writeDouble(val);
			out.flush();

			double sqrt = in.readDouble();
			System.out.println("sent up " + val + ", got back " + sqrt);

			// Don't ever send another request, but stay alive in
			// this eternally blocked state.
			Object lock = new Object();
			while ( true ) {
				synchronized ( lock ) {
					lock.wait();
				}
			}
		} catch ( Exception x ) {
			x.printStackTrace();
		}
	}
}