Java switch statement using final method parameter

Asked Jan 21 '18 at 01:24

Active Jan 21 '18 at 01:24

Viewed 29 times

This java method doesn't compile. It allows newName but not lastName. Can anyone explain why? Thanks!

void doStuff(String firstName, final String lastName)
{
    final String newName = "John";
    switch(firstName)
    {
    case newName:
    case lastName:
    }
}

edited Jan 21 '18 at 01:24

Hovercraft Full Of Eels

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asked Jan 21 '18 at 01:24

Doug

`"Can anyone explain why? "` -- the compiler can, what error message is it showing you? – Hovercraft Full Of Eels Jan 21 '18 at 01:25
1

`lastName` can vary at runtime. `newName` cannot. Case labels must be compile-time constants. – Tavian Barnes Jan 21 '18 at 01:26
The compile says that case statements must be constant. In this code, lastName and newName are both constant, yet the compiler allows newName but not lastName. – Doug Jan 21 '18 at 01:27
Oh I see. They must be compile-time constants. Got it, thanks! – Doug Jan 21 '18 at 01:29

Java switch statement using final method parameter

0 Answers0