What is the default value of an uninitialized int variable in a Java class?

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.

In Java, the default value of an uninitialized int variable depends on where it's declared. If an int is declared as a member variable (also known as an instance variable) of a class and not explicitly initialized, it is automatically assigned the default value of 0 by the Java Virtual Machine (JVM). This is because Java ensures that all member variables of a class are given default values if they are not explicitly initialized.

In this case, myInt is automatically initialized to 0.

However, if you declare an int variable inside a method (i.e. a local variable), Java does not assign it a default value. You must initialize it explicitly before using it, otherwise the code will not compile.

In summary:

• Class-level int variables (fields): default to 0

• Local int variables (inside methods): no default value; must be explicitly initialized before use

This behavior ensures safety and predictability in class-level design while enforcing proper initialization in local scopes.

Read More

How does a Full Stack Java course equip students with both front-end and back-end development skills, and what technologies are typically covered in the curriculum?

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

Visit QUALITY THOUGHT Training institute in Hyderabad

Get Directions