Exam2win > Programming > Java Programming > part8

Java Programming Questions and Answers

Software Programming : Java Programming QUESTIONS AND ANSWERS :: part8 : 6 to 10

Following Software Programming language Entrance Multiple choice objective type questions and answers will help you in Software Programming 2024 examinations :

6.Which of the following statements is true?

Non-static member classes must have either default or public accessibility

All nested classes can declare static member classes

Methods in all nested classes can be declared static

All nested classes can be declared static

Static member classes can contain non-static methods.

7.Which statement is true?

Objects can be explicitly destroyed using the keyword delete

An object will be garbage collected immediately after it becomes unreachable

If object obj1 is accessible from object obj2, and object obj2 is accessible from obj1, then obj1 and obj2 are not eligible for garbage collection

Once an object has become eligible for garbage collection, it will remain eligible until it is destroyed

If object obj1 can access object obj2 that is eligible for garbage collection, then obj1 is also eligible for garbage collection.

8.Which is the first line that will cause compilation to fail in the following program? class MyClass { public static void main(String[] args) { MyClass a; MySubclass b; a = new MyClass(); //(1) b = new MySubclass(); //(2) a = b; //(3) b = a; //(4) a = new MySubclass(); //(5) } } class MySubclass extends MyClass {}

Line labeled (1)

Line labeled (2)

Line labeled (3)

Line labeled (4)

Line labeled (5).

9.Which of the following statements is true?

Inheritance defines a has-a relationship between a superclass and its subclasses

Every java object has a public method named equals

Every java object has a public method named length

A class can extend any number of other classes

All of the above.

10.Given three classes A,B,C, where B is a subclass of A and C is a subclass of B, which one of these Boolean expressions is true when an object denoted by reference has actually been instantiated from class B as opposed to from A or C?

(o instanceof B) && (!(o instanceof A))

(o instanceof B) && (!(o instanceof C))

!((o instanceof A) || (o instanceof B))

(o instanceof B)

(o instanceof B) && !((o instanceof A) || (o instanceof C)).

More Java Programming QUESTIONS AND ANSWERS available in next pages