Codewars Kata - Compare within margin.java

Create a function close_compare that accepts 3 parameters: a, b, and an optional margin. The function should return whether a is lower than, close to, or higher than b.

Please note the following:

• When a is close to b, return 0.
• • For this challenge, a is considered "close to" b if margin is greater than or equal to the absolute distance between a and b.

Otherwise...

• When a is less than b, return -1.
• When a is greater than b, return 1.

If margin is not given, treat it as if it were zero.

Assume: margin >= 0

Tip: Some languages have a way to make parameters optional.

Example 1
If a = 3, b = 5, and margin = 3, then close_compare(a, b, margin) should return 0.

This is because a and b are no more than 3 numbers apart.

Example 2
If a = 3, b = 5, and margin = 0, then close_compare(a, b, margin) should return -1.

This is because the distance between a and b is greater than 0, and a is less than b.

public class Solution
{
    
    public static int closeCompare
    ( double a, double b )
    {
        return closeCompare( a, b, 0 );
    }
    
    
    
    public static int closeCompare
    ( double a, double b, double margin )
    {
        double d = a - b;
        
        if ( Math.abs( d ) <= margin )
        {
            return 0;
        }
        else
        {
            if ( d > 0 )
            {
                return 1;
            }
            else
            {
                return -1;
            }
        }
    }
    
}