Is it OK to compare an int and a long in Java
Yes, that's fine. The int will be implicitly converted to a long, which can always be done without any loss of information.
You can compare long and int directly however this is not recommended.
It is always better to cast long to integer before comparing as long value can be above int limit
long l = Integer.MAX_VALUE; //2147483647int i = Integer.MAX_VALUE; //2147483647System.out.println(i == l); // true l++; //2147483648 i++; //-2147483648System.out.println(i == l); // falseSystem.out.println(i == (int)l); // true