Keyword 'final' for java variables

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The ultimate java keyword for variables means it will only receive one value once, right?

If I have several variables in a function and I know that they should not receive any value later it is good to declare them as "final"?

void foo() {
final int a = 0;

// executa alguma coisa
final int b = 0;
// ...
final String a = "a";
}

Will this statement as the end make any important difference in compiled code? Will gain/lose performance?

java

1 answer

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There is no performance relationship. The main reason is just to link some more checks made by the compiler in search of errors.

When you put the modifier final In a variable, you’re telling the compiler to give you a build error if you somehow carelessly assign something to the variable. In the case of static or instance variables, the compiler also warns you of a build error if you simply forget to assign something. This is especially useful when you tamper with a code you developed months or years ago.

In short, it is something to prevent the programmer from shooting his own foot in some cases.

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