OOP Lab Task 1

Required Tutorials

Create a Java application project whose name contains your name and group using the format group_surname_name (use a single name and a single surname). Student John Codebreaker from 421G will create a project named 421G_Codebreaker_John .
Add to your project a class Message (that may be used some time in the future 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 Message objects in a way specific to chat programs: "sender: contents". This must be done using only one method call that returns the formatted string, ready to be displayed by any print method. Try first with a method of your own. Then, add another method, that does exactly the same thing but whose declaration 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, that instantiates at least three objects of type Message and then displays 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.
Follow the coding rules stated in Java Coding Conventions.

Submitting:

The assignment is submitted attaching the Java source code files 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 contains only the name of your project, exactly as it appears in the package declarations.
Attention Any deviation from these instructions may lead to the loss of the entire amount of points.