Homework 2A

Java Client / Server Programming: The Grade School Math Server

Using the java.net package (Socket and ServerSocket, etc) we taught in class to implement "The Grade School Math Server".  Here is a list of requirement:

• You have to implement a Java server (the "Math Server") AND a Java client.
  
• The Java server will be a multi-threaded Java server named MathServer which can be started using (9088 is the port started on):
  > java MathServer 9088
  > Grade School Math Server started ... waiting for input.
  >
  
• The Java client will be a Java application named AskMathQ that will communicate with the Math Server. It will take two parameters during startup. The syntax will be java AskMathQ <hostname> <port number>. For example:
  > java AskMathQ machine1.mathcs.sjsu.edu 9088
  > Grade School Math Server connected ... 
  > please ask your questions:
  >
  
• Four types of questions will be supported by both the client and the server.  They are (surprisingly) addition, subtraction, multiplication and division. 
  
• Addition:

Client	Server
> java AskMathQ machine1.mathcs.sjsu.edu 9088 > Grade School Math Server connected ...  > please ask your questions: > What is 740 + 328 ?  > Answer from server is 1086	> java MathServer 9088 > Grade School Math Server started ... waiting for input. > Input received ... 740 adds 328 > Answer is 1086 ... sending to client >

• Subtraction:
  

  Client	Server
  > What is 750 - 30.5 ? > Answer from server is 719.5	> Input received ... 750 subtracts 30.5 > Answer is 719.5 ... sending to client

• Multiplication
  

  Client	Server
  > What is 111 x 8 ? > Answer from server is 888	> Input received ... 111 multiples 8 > Answer is 888 ... sending to client

• Division
  

  Client	Server
  > What is 100 / 3 ? > Answer from server is 33.333	> Input received ... 100 divided by 3 > Answer is 33.333 ... sending to client

• All the computation HAVE to be done on the server. The client will ONLY send question and receive answer from server. Otherwise, no points will be awarded.
  
• Math Server has to be able to support multiple clients at the same time. (Multi-threaded).

NOTE: What to handin:

• Use a good word processor to writeup all the written assignments. Print them out and handin in class.
• Handin DETAIL running instructions and the actual program (source + class files + html file, etc). Print instruction and program listing out, and hand them in with the computer diskette.
• No late assignment will be accepted
• DO NOT EMAIL ANY assignment to me. Handin in class
• Handin the homework only if you are in the class
• Points will be taken off if you violate any of the above.
• (This happens to be a brand new homework ... I used to give similar homework2 from semester to semester (since people need to pick up the same thing to learn)... but then I got a lot of "similar" homeworks between people or people from past semester. So, if students copy each other's homework and got caught. Those students will finish the class early by receiving an F.)