OOP Lab Task 1

Required Tutorials

• The Object Oriented Paradigm; Classes and Objects
• Notions About the Java Language
• Writing and Executing a Java Program
• Java Syntax; A Program's Lexical Structure
• Java Coding Conventions

Requirements

• Write a class Message (that may be used later as a data carrier between a chat client and all the other clients connected to a server). This class needs to:
  • Store the name of the sender and a message content.
  • Be immutable (once an object of this type is created, its contents can't be changed).
  • Allow reading of the sender and content information from the Message objects in a way specific to chat programs: "sender: contents". This must be done using only one method call. Try first with a method of your own. Add another method, that does exactly the same thing but whose signature is

    public String toString()

    .

• Write another class called Main (the default class created if you created a project within NetBeans), which should contain only the main method, which instantiates at least three objects of type Message and then display their formatted string on the screen.

Notes:

• Each class and class member must have one of the two access modifiers public or private.
• The names of the classes must be identical to the ones specified above.

Submitting:

• The assignment is submitted attaching the Java source code files exclusively to an e-mail sent to arhitectura_procesoarelor@yahoo.com.
• The subject of the e-mail will be [OOP_1]
• The body of the e-mail will contain the name the student and any additional command you want to make.
• Attention Any deviation from these instructions may lead to the loss of the entire amount of points.