JENNIFER Interview Questions For Freshers

What is the difference between composition and inheritance?

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

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What are the different types of inheritance in Java?

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What is the purpose of the 'finally' block in exception handling?

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What is method overriding?

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What is the 'instanceof' operator used for?

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What is dynamic method dispatch?

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What is the difference between checked and unchecked exceptions?

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What is the purpose of the 'super' keyword in Java?

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How can you prevent a method from being overridden in Java?

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What is a package in Java?

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What are the four main principles of object-oriented programming?

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What are access modifiers in Java?

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What is the difference between 'final', 'finally', and 'finalize' in Java?

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How is encapsulation achieved in Java?

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What is a static method?

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How are exceptions handled in Java?

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What is the difference between '==' and '.equals()' in Java?

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What does the 'this' keyword refer to in Java?

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What is method overloading?

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What is the purpose of a constructor?

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What is the difference between 'throw' and 'throws' in Java?

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Explain the concept of polymorphism in Java.

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JENNIFER Intermediate Interview Questions

Explain the concept of method overloading in Java.

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What is the purpose of the 'transient' keyword in Java?

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How can you prevent a class from being inherited in Java?

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What is the 'instanceof' operator used for?

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What is the purpose of the 'this' keyword in Java?

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What is the difference between 'continue' and 'return' statements in Java?

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What are the different types of loops available in Java?

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What is the difference between checked and unchecked exceptions?

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What is the purpose of the 'finally' block in exception handling?

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What are the different types of nested classes in Java?

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What is method hiding in Java?

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What is the difference between 'Error' and 'Exception'?

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What is composition aggregation in Java?

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What is the difference between 'ArrayList' and 'Vector' in Java?

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What is the purpose of the 'synchronized' keyword in Java?

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What is the difference between 'continue' and 'break' statements in Java?

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What is the 'default' keyword used for in Java?

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What are the different types of inner classes in Java?

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What is autoboxing and unboxing in Java?

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What is the 'instanceof' operator used for?

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What is the difference between 'String', 'StringBuilder', and 'StringBuffer' in Java?

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What is the difference between 'static' and 'final' variables in Java?

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What is the purpose of the 'assert' keyword in Java?

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What are the advantages of using interfaces in Java?

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What is the purpose of the 'break' statement in Java?

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What is the difference between 'ArrayList' and 'LinkedList' in Java?

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What is the purpose of the 'volatile' keyword in Java?

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What is method chaining in Java?

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How is method hiding achieved in Java?

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What is the purpose of the 'transient' keyword in Java?

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What is an anonymous inner class in Java?

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Can a constructor be overridden in Java?

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JENNIFER Interview Questions For Experienced

Explain the concept of anonymous inner classes in Java.

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What is the 'Diamond Problem' in Java?

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What is the purpose of the 'strictfp' keyword in Java?

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What is the difference between 'method overloading' and 'method overriding' in Java?

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What is the purpose of the 'clone()' method in Java?

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What is the difference between 'Array' and 'ArrayList' in Java?

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What is the difference between 'TreeMap' and 'HashMap' in Java?

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What is the purpose of the 'Collections' class in Java?

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Explain the concept of default methods in interfaces.

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What is the difference between 'Enumeration' and 'Iterator' in Java?

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What is the purpose of the 'equals()' and 'hashCode()' methods in Java?

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What is the difference between 'HashMap' and 'HashTable' in Java?

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Explain the concept of lambda expressions in Java.

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What is the difference between 'LinkedHashSet' and 'HashSet' in Java?

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What is the purpose of the 'isInstance()' method in Java?

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Explain the concept of functional interfaces in Java 8.

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What is the difference between 'HashSet' and 'TreeSet' in Java?

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What is the purpose of the 'assert' keyword in Java?

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What is the difference between 'Comparable' and 'Comparator' interfaces?

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Explain the concept of method references in Java.

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What is the purpose of the 'strictfp' keyword in Java?

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What is the difference between 'Array' and 'ArrayList' in Java?

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What is the 'instanceof' operator used for?

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