Java – what is the purpose of using final for loop variables in an enhanced for loop?

I understand how the following statement works

for(final Animal animal : animalList){
//do some function
}

But what is the purpose of using the final keyword here?

Solution

There are two possible reasons for this:

>It can simply avoid accidentally changing loop variables in the loop body (or record the fact that the loop variable will not be changed) > you can do this so that you can reference the loop variable in an anonymous inner class For example:

for(final Animal animal : animalList){
    executor.submit(new Runnable(){
        public void run() {
            animal.Feed();
        }
    });
}

If the last content is omitted in this example, it is a compilation error

Updating it is not a compilation error in Java 8 and later Nonlocal variables now only need to be effectively finalized Simply put, this means that after initial declaration / initialization, the variable is not assigned to (using assignment operators or pre / post increment or decrement operators)