Static final String strVal Hello world

The class no longer requires a <clinit> method, because the constants go into classfile static field initializers, which are handled directly by the VM. Code accessing intVal will use the integer value 42 directly, and accesses to strVal will use a relatively inexpensive "string constant" instruction instead of a field lookup.

Declaring a method or class "final" does not confer any immediate performance benefits, but it does allow certain optimizations. For example, if the compiler knows that a "getter" method can't be overridden by a sub-class, it can inline the method call.

You can also declare local variables final. However, this has no definitive performance benefits. For local variables, only use "final" if it makes the code clearer (or you have to, e.g. for use in an anonymous inner class).

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