CODEWITHSUNDEEP
javaclassarguments
Yassine Badache
Yassine Badache

Reputation: 1851

Field limit in class

Is there a limit to how many fields can be declared in a Java class? This question addresses the number of arguments of a method, but I am curious knowing if a Java class has any limit, and what is this limit.

This is just out of curiosity - I wouldn't actually declare a class with thousands of fields.

Upvotes: 2

Views: 404

Answers (2)

uoyilmaz
uoyilmaz

Reputation: 3105

Yes, 65535. It is explained here https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.11

The relevant part is:

The number of fields that may be declared by a class or interface is limited to 65535 by the size of the fields_count item of the ClassFile structure (§4.1).

Note that the value of the fields_count item of the ClassFile structure does not include fields that are inherited from superclasses or superinterfaces.

Upvotes: 4

Tunaki
Tunaki

Reputation: 137309

Exactly 65535, not counting the inherited fields.

From Limitations of the Java Virtual Machine:

The number of fields that may be declared by a class or interface is limited to 65535 by the size of the fields_count item of the ClassFile structure (§4.1).

Note that the value of the fields_count item of the ClassFile structure does not include fields that are inherited from superclasses or superinterfaces.

Upvotes: 8

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