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JAVA Interview Questions and Answers

Define JAVA?

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Name some important features of Java 12 release?

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what do you know about OOPS Concepts in Java?

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What do you mean by Platform Independence of Java?

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Why Java is not pure Object Oriented language?

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Define object?

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Define class in Java?

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Can you compare overloading with overriding?.

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What are the various access specifiers in Java classes?

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What’s the purpose of Static methods and static variables?

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Why Java is not 100% Object-oriented?

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Define wrapper classes in Java?

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Define constructors in Java?

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What happens if you remove static modifier from the main method?

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What is “this” keyword in Java?

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What is JIT compiler?

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What is classloader?

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What are the advantages of Packages in Java?

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What is an object?

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How are Java objects stored in memory?

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What is data encapsulation and what is its significance?

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Define singleton class?. Give a practical example of its usage.

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What is the difference between double and float variables in Java?

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What is an Interface?

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What is the difference between an abstract class and an interface?

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What is Marker interface?

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How can you generate random numbers in Java?

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Why pointers are not used in Java?

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Can we declare a class as Abstract without having any abstract method?

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How many types of constructors are used in Java?

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What is Polymorphism?

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What is meant by Ordered and Sorted in collections?

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Can we make constructors static?

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Does Importing a package imports its sub-packages as well in Java?

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What is Enum in Java?

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Define JSON?

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What is composition in java?

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How an object is serialized?

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What is the difference between a local variable and an instance variable?

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Why Java Strings are immutable in nature?

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What is composition?

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What is the difference between aggregation and composition?

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Explain the Priority Queue?

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What is super in java?

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What are the differences between this and super keyword?

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Explain Exception Propagation?

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