How does garbage collection work in Java?

Quality Thought is a leading Full Stack Java Institute in Hyderabad, offering comprehensive training and a live internship program designed to equip students with the practical skills needed to excel in the software development industry. Our expert instructors provide hands-on training in both front-end and back-end technologies, ensuring that participants gain a well-rounded understanding of the Full Stack Java ecosystem.

Our live internship program allows students to work on real-world projects, giving them valuable industry experience and the opportunity to apply what they've learned in a professional setting. This unique learning model bridges the gap between theoretical knowledge and practical application, helping students build a strong portfolio to showcase to potential employers.

As a top-rated Full Stack Java Institute in Hyderabad, Quality Thought focuses on providing personalized training sessions, ensuring that every student receives the attention and support needed to succeed. Our course covers core Java, Spring Boot, Angular, React, database management, and more.

Garbage collection in Java is an automatic memory management process handled by the Java Virtual Machine (JVM). Its main role is to identify and remove objects that are no longer reachable from any references in the program, freeing up memory and preventing memory leaks.

Java uses a technique called "tracing garbage collection", where the JVM starts from a set of "root" references (like static fields, local variables on the stack, etc.) and traverses all objects that are reachable. Any object that cannot be reached through this graph is considered garbage and eligible for collection.

The JVM employs generational garbage collection, which divides the heap into generations:

• Young Generation: where new objects are created. It's collected frequently using a fast, minor garbage collection.

• Old (Tenured) Generation: where long-lived objects are promoted. It's collected less often, using a more thorough major garbage collection.

• Permanent Generation/Meta space: (depending on JVM version) holds class metadata.

Modern JVMs use Garbage Collector algorithms like:

• Serial GC: simple, good for small applications.

• Parallel GC: uses multiple threads, suited for multi-core systems.

• G1 GC (Garbage First): designed for large heaps, balances pause times and throughput.

Developers don't need to manually manage memory, but writing memory-efficient code and avoiding unnecessary object creation can improve performance and reduce GC overhead.

Read More

What exactly is Full Stack Java development?

What are checked and unchecked exceptions in Java?

Visit QUALITY THOUGHT Training institute in Hyderabad