Mixed Questions

Question 1

What are wrapper classes in Java?

Answer 1

Wrapper classes allow primitive data types to be accessed as objects. Turning a primitive to Wrapper is called Autoboxing, converting Wrapper back to primitive is called Unboxing.

Question 2

What is System class?

Answer 2

System.class is a final class provided by lava.lang package. The purpose of System class is to provide access to system resources.

Question 3

What is the other name of Shallow Copy in Java?

Answer 3

Object cloning.

Question 4

What is the difference between Shallow copy & Deep copy?

Answer 4

Shallow copy just copies the values of the references in the class. A Deep copy copies the values of the object as well.

Question 5

What is a singleton class?

Answer 5

A Singleton class in Java has maximum one instance of the class present in JVM, all the time. The constructor is written in a way that it never creates more than one object of the same class.