Custom variable scope

Question

Is it allowed to just place some curly braces without any if/for/etc statements to limit the variable scope?

An example:

public void myMethod()
{
    ...
    {
        int x;
        x = 5;
    }
    ...
}

I may want to do this, so I know for sure I won't access/change the variable outside the scope and that it will be destroyed beforehand

I did and it worked, but I was not sure is it allowed to do so or not. I also tried to search the web and found nothing about scopes like this. That's why I decided to ask — Gray K, Apr 17 '17 at 23:44
[check this](http://stackoverflow.com/questions/241088/what-do-curly-braces-in-java-mean-by-themselves) — José Fonte, Apr 17 '17 at 23:45
Possible duplicate of [What is the difference between scope and block?](http://stackoverflow.com/questions/22575444/what-is-the-difference-between-scope-and-block) — Juan Mendes, Apr 17 '17 at 23:47

score 3 · Accepted Answer · answered Apr 17 '17 at 23:42

3

Yes, it's allowed. Just try and see for youtself

answered Apr 17 '17 at 23:42

Sheinbergon

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score 2 · Answer 2 · answered Apr 18 '17 at 00:23

The curly braces { .. } limit the scope of variables to the block.
However, changes can be made to global variables falling into the scope of { .. } block.

int x = -1;
double y = 5;
{
    x = 10;
    y = 100;
    char c = 'A';
}
System.out.println(x + " " + y); // 10 100.0
System.out.println(c); // Compile time error and out of scope

{
    c = 'B';  // Compile time error and out of scope
}

Custom variable scope

2 Answers2