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CASTIN IN JAVA

Quiz by Mr Le

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11 questions
Show answers
  • Q1
    What is the purpose of casting in Java?
    To define a method
    To create a new object
    To convert a variable from one data type to another
    To initiate a loop
    30s
  • Q2
    What does it mean to cast an object in Java?
    To treat an object as a different type
    To create a new instance of an object
    To assign an object to a variable
    To delete an object from memory
    30s
  • Q3
    What is the result of casting an integer 10 to a double in Java?
    10
    Error
    10.5
    10.0
    30s
  • Q4
    What is the type of the variable 'result' after executing the following code: 'double result = (double) 5 / 2; '?
    int
    float
    double
    long
    30s
  • Q5
    In the context of casting, which of the following statements is true?
    Casting always results in data loss
    You can cast an object to a subclass type if it is actually an instance of that subclass
    Casting is unnecessary in Java
    You can cast an object to any type without restrictions
    30s
  • Q6
    What will be the output of the following code: 'int x = (int) 3.7; System.out.println(x);'?
    4
    3
    3.7
    Error
    30s
  • Q7
    What will happen if you try to narrow cast a double to an int without explicit casting?
    The value will be truncated
    The value will be rounded automatically
    The program will run without issues
    A compile-time error will occur
    30s
  • Q8
    What is widening casting in Java?
    Converting a larger data type to a smaller data type
    Casting between unrelated object types
    Changing the type of a variable permanently
    Converting a smaller data type to a larger data type
    30s
  • Q9
    What type of casting is used when converting a larger data type to a smaller data type in Java?
    Widening casting
    Implicit casting
    Narrowing casting
    Automatic casting
    30s
  • Q10
    Which of the following is a valid way to perform a cast in Java?
    myVariable.toInt()
    myVariable as int
    int(myVariable)
    (int) myVariable
    30s
  • Q11
    Which of the following is a valid way to cast an object in Java?
    String str = (String) obj;
    float f = obj;
    int num = (int) obj;
    boolean flag = (boolean) obj;
    30s

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