Simple question about multi-threading

[intrepid604]

I'm trying to understand multi-threading. Can someone explain how this works:

When you stream info back and forth from client and server, is the order of that data as important as the following snippet (full code below) would seem to indicate?

//snippet

DataInputStream inputFromClient = new DataInputStream(socket.getInputStream());
DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream());
				
while(true)
{
double interestRate = inputFromClient.readDouble(); //so does the client therefore HAVE to send the interestRate value first?
int years = inputFromClient.readInt();
double amount = inputFromClient.readDouble();

Full code for the server:

import java.io.*;
import java.net.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;

public class Q303 extends JFrame 
{

	private JTextArea jta = new JTextArea();
	
	public static void main(String args[])
	{
		new Q303();
	}
	
	public Q303()
	{
		setLayout(new BorderLayout());
		add(new JScrollPane(jta), BorderLayout.CENTER);
		
		setTitle("Server");
		setSize(500,300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
		
		try 
		{
			ServerSocket serverSocket = new ServerSocket(8000);
			jta.append("Server started at " + new Date() + '\n');
			
			int clientNo = 1;
			
			while(true)
			{
				Socket socket = serverSocket.accept();
				jta.append("starting thread for client " + clientNo + " at " + new Date() + '\n');
				
				InetAddress inetAddress = socket.getInetAddress();
				jta.append("Client " + clientNo + "'s host name is " + inetAddress.getHostName() + '\n');
				jta.append("Client " + clientNo + "'s IP address is " + inetAddress.getHostAddress() + '\n');
				
				HandleAClient task = new HandleAClient(socket);
				
				new Thread(task).start();
				
				clientNo++;
			}
		}
		catch(IOException ex) 
		{
			System.out.println(ex);
		}
	}
	
	class HandleAClient implements Runnable
	{
		private Socket socket;
		
		public HandleAClient(Socket socket) 
		{
			this.socket = socket;
		}
		
		public void run()
		{
			try 
			{
				DataInputStream inputFromClient = new DataInputStream(socket.getInputStream());
				DataOutputStream outputToClient = new DataOutputStream(socket.getOutputStream());
				
				while(true)
				{
					double interestRate = inputFromClient.readDouble();
					int years = inputFromClient.readInt();
					double amount = inputFromClient.readDouble();
					
					double loanTotal = amount * interestRate;
					double monthlyPayment = loanTotal / (12 * years);
					
					outputToClient.writeDouble(monthlyPayment);
					
					jta.append("Interest Rate received from client: " + interestRate + '\n' );
					jta.append("Years received from client: " + years + '\n' );
					jta.append("Amount received from client: " + amount + '\n' );
					
					jta.append("Monthly payment caluclated: " + monthlyPayment + '\n' );
					jta.append("Sending calculation to client...");	
				}
			}
			catch(IOException e)
			{
				System.err.println(e);
			}
		}	
	}
}

Thanks for any tips!