boolean condition verification

Question

I want to do boolean check like this.This doesn't work. But my idea is like this

if(num==(1,2,3)){
        println (num)
    }

or

if(num==(1|2|3)){
        println (num)
    }

How can I do this?

Answer 1

if ((1 to 3) contains num) {
  print(num)
}

Answer 2

num==(1,2,3) is not a valid expression in Java. (Although in C and C++ it is equivalent to num == 3).

You need to write if (num == 1 || num == 2 || num == 3).

If num is an integral type, you could use if (num >= 1 && num <= 3).