30 Top Interview Questions and Answers (2024)

Ques 1

What is Garbage Collection in Java?

Garbage Collection is the automatic process of reclaiming the runtime unused memory by destroying the objects that are no longer reachable or referenced by the program.

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Ques 2

What is the role of the JVM (Java Virtual Machine) in garbage collection?

The JVM is responsible for managing the memory, including garbage collection. It runs the garbage collector to identify and reclaim unused memory.

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Ques 3

What is the purpose of the Young Generation in the Java heap?

The Young Generation is the part of the heap where new objects are created. It is designed for short-lived objects, and garbage collection occurs more frequently in this generation.

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Ques 4

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

The 'finalize()' method is called by the garbage collector before an object is reclaimed. It allows an object to perform cleanup operations before being garbage collected.

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Ques 5

What is the role of the Old Generation in the Java heap?

The Old Generation is the part of the heap that holds long-lived objects. Objects that survive multiple garbage collection cycles in the Young Generation are eventually promoted to the Old Generation.

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Ques 6

What is the purpose of the 'System.gc()' method in Java?

The 'System.gc()' method is a hint to the JVM that suggests running the garbage collector. However, its actual execution is at the discretion of the JVM, and it may be ignored in some implementations.

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Ques 7

Explain the role of the '-XX:+UseG1GC' JVM option in enabling the G1 garbage collector.

The '-XX:+UseG1GC' option is used to enable the G1 garbage collector in Java. It instructs the JVM to use the G1 collector as the garbage collection algorithm.

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Freshers / Beginner level questions & answers

What is Garbage Collection in Java?

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What is the role of the JVM (Java Virtual Machine) in garbage collection?

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What is the purpose of the Young Generation in the Java heap?

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

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What is the role of the Old Generation in the Java heap?

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What is the purpose of the 'System.gc()' method in Java?

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Explain the role of the '-XX:+UseG1GC' JVM option in enabling the G1 garbage collector.

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