Two simple programs interacting

[1sprit]

Hi!

I'm trying to make the code below work. But I don't know what I'm doing wrong as I dont get any error message. Some help would be much appriciated.

package FleraProgram;

import java.net.*; //Socket
import java.io.*;  //Strömmar,Utmatning/Inmatning

//Detta program ansluter till ett väntande program och kommunicerar med det genom att
//skicka heltal.

class Anslutande {
	public static void main (String[] args)
	{
		Socket vantandePart = null;
		
		try
		{
			//Skapar förbindelsen till det väntande programmet i samma dator 
			//som väntar på given port
			
			vantandePart = new Socket ("localhost",1201);
			
			//Kommunikationsverktyg
			
			OutputStream	os = vantandePart.getOutputStream();
			PrintWriter		out = new PrintWriter (os,true);
			
			InputStream		is = vantandePart.getInputStream();
			
			BufferedReader 	in = new BufferedReader(new InputStreamReader(is));
			
			
			//Läser och sparar angivet heltal
			//out.println("Skriv in ett heltal:");
			int u=2;
			int v;
			
			if(u==-1)
			{
				out.println("bla bla");
				vantandePart.close();
			}
			
			else
			{	
			
			//Skicka heltalet
			
			out.println(u);
			
			//Ta emot svaret
			
			v=in.read();
			
			//Visa svaret
			
			out.println(v);
		
		System.out.println();
			}
	}
	catch (IOException e)
	{
		e.printStackTrace();
	}
	finally
	{
		try
		{
			vantandePart.close();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		}
		}
	}

package FleraProgram;

import java.net.*; //Socket,Serversocket
import java.io.*; //Strömmar,Utmatning/Inmatning

//Ett program som väntar på Anslutande.java. Vantande.java tar emot heltal och beräknar kvadrat
//roten ur dessa och returnerar.

class Vantande {
	
	public static void main(String[] args)
	{
		//väntande verktyg
		
		ServerSocket	ss = null;
		
		//anslutande parten
		
		Socket		anslutandePart = null;
		
		try
		{
			//objekt som väntar på given port
			
			ss = new ServerSocket(1201);
			
			//acceptera anslutningen
			
			anslutandePart = ss.accept();
			
			//stäng väntande objekt
			
			ss.close();
			
			//Kommunikationsverktyg
			
			OutputStream	os = anslutandePart.getOutputStream();
			PrintWriter		out = new PrintWriter(os,true);
			
			InputStream		is = anslutandePart.getInputStream();
			BufferedReader in = new BufferedReader(new InputStreamReader(is));
			
			//ta emot heltal
			
			int v;
		
			v=in.read();
			
			int u=(int) Math.sqrt(v);
			
			//visa heltal
			out.println(v);
			
			try
			{
				Thread.sleep(4000);
				
			}
			catch (InterruptedException e)
			{}
			
			//skicka svaret
			
			out.println(u);
			
		
		System.out.println();
			
	}
	catch (IOException e)
	{
		e.printStackTrace();
	}
	
	finally
	{
		try
		{
			ss.close();
			anslutandePart.close();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		
		}
	}
}

[KevinWorkman]

What does it do wrong? Have you stepped through it with a debugger, or at least thrown in some print statements? What's happening? What did you expect to happen?

[1sprit]

Anslutande.java sends an integer to Vantande.java. Vantande.java calculates the sqrt of the int and returns it. If Anslutande.java sends -1 the communication between the programs stops.

When i run it nothing happens. I have tried sending strings between them and that works.

[Hibernate]

I would suggest you submit you code's comment in English instead of Swedish next time. As long as you have comments, share them, maybe people will be able to understand your code easier. If you don't what to translate them, remove them do the code gets clearer.


You can use å, ä, ö, α, β, γ, ψ, ζ or almost any other character in variable, method and class names, but if you do; make use you save the code file using UTF-8.
When generating Javadoc, I thing you may be required to add encoding=utf-8 as a parameter.
However I would not recommend using non-ASCII characters in Class names as they are used in file names which may cause problems is some scenarios.