OOP Lab Task 1

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Required Tutorials

Requirements

  • 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.