Netxs Solutions Junior Java Developer Interview Questions and Answers

Aptitude test is the round of i step to enter the compition

Q1. What is method overloading and method overriding
Ans. 
Method overloading is creating multiple methods with the same name but different parameters. Method overriding is creating a new implementation of an existing method in a subclass.
• Method overloading is used to provide different ways of calling the same method with different parameters.

• Method overriding is used to change the behavior of an existing method in a subclass.

• Method overloading is resolved at compile-time base...read more
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Q2. What is polymorphism
Ans. 
Polymorphism is the ability of an object to take on many forms.
• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It is achieved through method overriding and method overloading.

• Example: A parent class Animal can have child classes like Dog, Cat, and Bird. All these child classes can have their own implementation of the method 'makeSound', but they can be treated as Animals.

• ...read more
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Q3. Can we overload the constructer
Ans. 
Yes, we can overload the constructor in Java.
• Overloading constructor means creating multiple constructors with different parameters.

• The constructors can have different number of parameters or different types of parameters.

• The constructor with the matching parameters will be called during object creation.
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Q4. What is data type
Ans. 
Data type is a classification of data based on the type of value it holds.
• Data type determines the type of operations that can be performed on the data.

• Examples of data types include integer, float, boolean, and string.

• Data types can be primitive or non-primitive.

• Primitive data types are predefined by the language and non-primitive data types are created by the programmer.
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