Re-declaring variables inside loops in Java

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Think of this way, after each loop, the scope is “destroyed”, and the variable is gone. In the next loop, a new scope is created, and the variable can be declared again in that scope.

You can also do this, for the similar reason

{
   int someInteger = 3;
}
{
   int someInteger = 13;
}

By the way, Java does not allow local variable shadowing, which might be inconvenient 

int x = 3;
{
   int x = 13; // error!
}

Consumer<Integer> consumer = (x)->print(x);  // ERROR! 
// lambda parameter is treated like local variable

Runnable r = ()->{ int x; ... } // ERROR
// lambda body is treated like local block

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