Java Default Values and Null
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Questions and Answers

What is the default value of a local variable inside a method in Java?

  • No default value (correct)
  • 0
  • false
  • null

    • What happens to the object previously referenced by c1 after the assignment c1 = c2?

  • It is stored in memory
  • It becomes the new reference
  • It is garbage collected
  • It is no longer referenced (correct)

    • What is the default value of a data field of a reference type?

  • null (correct)
  • false
  • 0
  • '\u0000'

    • What is the default value of a char type data field?

    <p>'\u0000'</p> Signup and view all the answers

    What happens when a data field of a reference type does not reference any object?

    <p>It holds the value null</p> Signup and view all the answers

    What is the default value of a boolean type data field?

    <p>false</p> Signup and view all the answers

    What is the correct way to invoke a non-static method in Java?

    <p>Using an object reference variable, such as myCircle.getArea()</p> Signup and view all the answers

    What is the default value of the boolean data field isScienceMajor in the Student class?

    <p>False</p> Signup and view all the answers

    What is the correct way to invoke a method in the Math class?

    <p>Using the class name, such as Math.getArea()</p> Signup and view all the answers

    What is the data type of the data field name in the Student class?

    <p>String</p> Signup and view all the answers

    What is the default value of the char data field gender in the Student class?

    <p>''</p> Signup and view all the answers

    Can you invoke a non-static method using the class name?

    <p>No, never</p> Signup and view all the answers

    What is the primary motivation for using object-oriented programming?

    <p>To develop graphical user interfaces and large scale software systems</p> Signup and view all the answers

    What defines the identity of an object?

    <p>Its unique identity</p> Signup and view all the answers

    What is a class in object-oriented programming?

    <p>A construct that defines objects of the same type</p> Signup and view all the answers

    What is the state of an object composed of?

    <p>A set of data fields with their current values</p> Signup and view all the answers

    What is the behavior of an object defined by?

    <p>A set of methods</p> Signup and view all the answers

    What are objects in object-oriented programming?

    <p>Entities in the real world that can be distinctly identified</p> Signup and view all the answers

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