STI IT1712 Classes and Methods Quiz
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Questions and Answers

What does the void keyword denote in a method?

  • It specifies the method is used to return a value
  • It requires the method to return multiple values
  • It signifies the method does not return a value (correct)
  • It indicates the method returns a value

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

  • Parameters are the list of variables in a method declaration, while arguments are the actual values passed when invoking the method (correct)
  • Parameters are declared in a method, while arguments represent the method's return type
  • Parameters are actual values passed to a method, while arguments are variables in a method declaration
  • Parameters and arguments are interchangeable terms referring to the same concept

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

  • To restrict the types of values that can be returned by the method
  • To allow returning multiple data types seamlessly
  • To ensure the method can return any data type as needed
  • To prevent errors and ensure consistency in data handling (correct)

    • What do instance variables refer to in Java?

    <p>Variables declared outside methods, constructors, or blocks</p> Signup and view all the answers

    What purpose does 'this' keyword serve in Java?

    <p>Represents an object's name receiving the method call within a method definition</p> Signup and view all the answers

    What is the main purpose of a mutator method in Java?

    <p>To change the data stored in one or more private instance variables</p> Signup and view all the answers

    How does a private method in Java differ from a public method?

    <p>A private method cannot be invoked outside its class, while a public method can.</p> Signup and view all the answers

    What is encapsulation in object-oriented programming?

    <p>The process of combining data and actions into a single item</p> Signup and view all the answers

    In Java, what does a UML Class Diagram display?

    <p>The structure of a class including name, variables, and methods</p> Signup and view all the answers

    How are references handled in Java with respect to objects?

    <p>Variables hold memory addresses of objects</p> Signup and view all the answers

    Study Notes

    Classes and Methods

    • The void keyword indicates that a method does not return a value.
    • A parameter is a list of variables in a method declaration, while an argument is the actual value passed when the method is invoked.
    • The data type of the return value must match the declared return type.

    Instance Variables and Local Variables

    • Instance variables are variables declared outside a method, constructor, or block.
    • Local variables are variables declared within a method definition and are only visible to that method.

    The this Keyword

    • The this keyword represents the object's name receiving the method call within a method definition.

    Information Hiding and Encapsulation

    • Information hiding is a mechanism for restricting access to some of an object's components.
    • Advantages of information hiding include:
      • Making components easier to understand and use
      • Simplifying modification and repair
      • Facilitating re-use
    • If an instance variable is public, there are no restrictions on where its name can be used.
    • If an instance variable is private, its name cannot be used to access it outside of the class definition.
    • Accessor methods are public methods that return data from private instance variables.
    • Mutator methods are public methods that change the data stored in one or more private instance variables.

    Encapsulation

    • Encapsulation is the process of combining data and actions into a single item.
    • It groups instance variables and methods into a class and hides implementation details.

    UML Class Diagram

    • The UML Class Diagram describes the structure of a class by displaying the class name, variables, and methods.

    Objects and References

    • A variable of a class type contains the memory address of the object named by the variable, rather than the object itself.
    • The address of the object's memory location is called a reference to the object.
    • Class types are reference types whose variables hold references or memory addresses.
    • Use the equals() method for comparison, instead of ==.

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    Test your knowledge on class methods and definitions in STI IT1712! Learn about the void keyword, parameters versus arguments, return types, and instance variables.

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