Overriding interface's variable?

As I read from various Java book and tutorials, variables declared in a interface are constants and can't be overridden.

I made a simple code to test it

interface A_INTERFACE
{ 
    int var=100; 
}

class A_CLASS implements A_INTERFACE
{ 
    int var=99; 
    //test
    void printx()
    {
        System.out.println("var = " + var);
    }
}

class hello
{

    public static void main(String[] args)
    {
        new A_CLASS().printx();
    }
}

and it prints out var = 99

Is var get overridden? I am totally confused. Thank you for any suggestions!

Thank you very much everyone! I am pretty new to this interface thing. "Shadow" is the key word to understand this. I look up the related materials and understand it now.