Interview question based on skill :
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Total Questions: 20
1. Which among the following is false for a constructor?
Correct Answer is : Constructors are always user defined
2. When is the constructor called for an object?
Correct Answer is : As soon as object is created
3. Which among the following function can be used to call default constructor implicitly in java?
Correct Answer is : this()
4. Why do we use constructor overloading?
Correct Answer is : To initialize the object in different ways
5. If programmer have defined parameterized constructor only, then __________________
Correct Answer is : Default constructor will not be created by the compiler implicitly
6. Which among the following is not valid in java?
Correct Answer is : Recursive constructor call
7. Which constructor will be called from the object obj2 in the following program? class A { int i; A() { i=0; } A(int x) { i=x+1; } A(int y, int x) { i=x+y; } }; A obj1(10); A obj2(10,20); A obj3;
Correct Answer is : A(int y, int x)
8. What is we only create an object but don’t call any constructor for it in java?
Correct Answer is : Object is created but points to null
9. Which among the following is false?
Correct Answer is : Constructor can’t be overloaded in Kotlin
10. Which is correct syntax?
Correct Answer is : classname objectname= new classname();
11. What does memory allocation for objects mean?
Correct Answer is : Actual creation and memory allocation for object members
12. Where is the memory allocated for the objects?
Correct Answer is : RAM
13. When is the memory allocated for an object?
Correct Answer is : When object constructor is called
14. Using new is type safe as _______________________
Correct Answer is : It doesn’t require to be specified with type of data
15. Which of the following function can be used for dynamic memory allocation of objects?
Correct Answer is : both malloc() and calloc()
16. How much memory will be allocated for an object of class given below? class Test{ int mark1; int mark2; float avg; char name[10]; };
Correct Answer is : 22 Bytes
17. Which keyword among the following can be used to declare an array of objects in java?
Correct Answer is : new
18. When is the memory allocated for an object gets free?
Correct Answer is : When object goes out of scope
19. Which among the following keyword can be used to free the allocated memory for an object?
Correct Answer is : either delete or free
20. Which function is called whenever an object goes out of scope?
Correct Answer is : Destructor function
