Answer / chaitu

Class File verification is used by Java Virtual Machine (JVM) before full startup of the JVM occurs in running bytecode of an application. This can be done in four Passes-

Pass-1:- Check byte code attributes, magic number, constant pool must not have any superficial data, and class file must not have extra bytes at end.

Pass-2:- Check every class behaviour and attribute and every class has valid names, classes, descriptor, and packages.

Pass-3:- Check code linking, attribute, and analysis data flow.

Pass-4:- Check where class loading occurs to finalize the class verification process.

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