Updated libraries and increased test coverage

src/main/java/com/mattrixwv/generators/HexagonalNumberGenerator.java

@@ -1,10 +1,10 @@
 //JavaClasses/src/main/java/mattrixwv/HexagonalNumberGenerator.java
 //Matthew Ellison
 // Created: 08-20-22
-//Modified: 08-20-22
+//Modified: 04-13-23
 //This class generates hexagonal numbers
 /*
-Copyright (C) 2022  Matthew Ellison
+Copyright (C) 2023  Matthew Ellison
 
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU Lesser General Public License as published by
@@ -27,7 +27,7 @@ import java.util.NoSuchElementException;
 
 
 public class HexagonalNumberGenerator implements Iterator<Long>{
-	private Long num;
+	protected long num;
 
 	public HexagonalNumberGenerator(){
 		num = 1L;
@@ -35,23 +35,25 @@ public class HexagonalNumberGenerator implements Iterator<Long>{
 
 	@Override
 	public boolean hasNext(){
-		return (2 * num * num) > 0;
+		return (2 * num * num) > num;
 	}
 
 	@Override
 	public Long next(){
-		Long newNum = ((2 * num * num) - num);
-		++num;
-		if(num > 0){
-			return newNum;
-		}
-		else{
+		//If the number will result in an overflow throw an exception
+		if(!hasNext()){
 			throw new NoSuchElementException("Number overflow");
 		}
+
+		//Generate and return the hexagonal number
+		Long hexNum = ((2L * num * num) - num);
+		++num;
+
+		return hexNum;
 	}
 
 	public static boolean isHexagonal(Long x){
-		Long n = Math.round((Math.sqrt(1.0 + (8 * x)) + 1) / 4);
-		return ((2 * n * n) - n) == x;
+		Long n = Math.round((Math.sqrt(1.0D + (8L * x)) + 1L) / 4L);
+		return ((2L * n * n) - n) == x;
 	}
 }