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

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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.

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