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Java Interview Questions & Answers · IT Interview Practice
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Curated Java interview questions with detailed answers.
30
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›
What is the Java Collections Framework?
Middle
#Data Structures
#Java
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›
What is the difference between an interface and an abstract class?
Middle
#Oop
#Java
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›
What are generics and why use them?
Middle
#Language
#Java
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›
Why must you override equals() and hashCode() together?
Middle
#Oop
#Java
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›
What is the Stream API?
Middle
#Functional
#Java
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›
What are lambdas and functional interfaces?
Middle
#Functional
#Java
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›
What is Optional and how does it help with null?
Middle
#Language
#Java
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›
What is the difference between Comparable and Comparator?
Middle
#Data Structures
#Java
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›
How do enums work in Java?
Middle
#Language
#Java
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›
What are the kinds of nested classes in Java?
Middle
#Oop
#Java
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›
What is autoboxing and what are its pitfalls?
Middle
#Language
#Java
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