IT1712 Classes and Methods: Class Methods and Definitions
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Questions and Answers

What is the main purpose of encapsulation in object-oriented programming?

  • To directly store objects in variables
  • To display the structure of a class in UML diagrams
  • To combine data and actions into a single unit (correct)
  • To make all methods public for easy access

    • Which method should be used in Java for comparing two objects of a class type?

  • equals() method (correct)
  • == operator
  • compareTo() method
  • equal() function

    • What does a private method in a class prevent from happening within the class?

  • Changing the data stored in private instance variables
  • Invoking methods in other classes (correct)
  • Creating UML Class Diagrams
  • Accessing private instance variables

    • In Java, what is stored in a variable of a class type?

    <p>Memory address of the object</p> Signup and view all the answers

    What are class types in Java considered as?

    <p>Reference types whose variables hold memory addresses</p> Signup and view all the answers

    What is the purpose of using the void keyword in a method declaration?

    <p>To specify that the method does not return a value</p> Signup and view all the answers

    What is the difference between a parameter and an argument in a method?

    <p>A parameter is the actual value passed when the method is invoked; an argument is a list of variables in a method declaration.</p> Signup and view all the answers

    Why must the data type of the return value match the declared return type in a method?

    <p>To maintain data type consistency in the program</p> Signup and view all the answers

    What do local variables refer to in Java programming?

    <p>Variables declared within a method definition and only visible within it</p> Signup and view all the answers

    Why is information hiding important in object-oriented programming?

    <p>To simplify use and understanding of object components</p> Signup and view all the answers

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