Day 1 Wipro Training

Which of the following is true about constructor overloading in Java?

• Constructors can have the same name and parameter list

• Constructors must return a value

• Constructors can be overloaded with different parameter types

• Constructors cannot be overloaded

Which keyword prevents a class from being inherited?

• abstract

• static

• final

• private

Which of these is not a feature of OOP in Java?

• Compilation

• Polymorphism

• Encapsulation

• Inheritance

What is the output of the following code?

• 5

• 10

• 15

• Compilation error

Which access modifier allows access only within the same package?

• private

• protected

• public

• default

What is the result of "10" + 20 + 30 in Java?

• 1050.30

• 1050

• 1050.0

• 102030

What is true about ArrayList in Java?

• It's thread-safe

• It stores primitive types only

• It's dynamic

• It is fixed in size

What does the static keyword in Java indicate?

• Method belongs to the instance

• Method belongs to the class

• Method is synchronized

• Method is private

Which data structure ensures insertion order is maintained?

• HashSet

• TreeSet

• LinkedHashSet

• HashMap

What is the default value of an uninitialized boolean array element?

• false

• true

• null

• 0