Fix sonarqube findings

src/main/java/com/mattrixwv/Triple.java

@@ -48,8 +48,7 @@ public class Triple<T, U, V>{
 		if(this == o){
 			return true;
 		}
-		else if(o instanceof Triple<?, ?, ?>){
-			Triple<?, ?, ?> rightSide = (Triple<?, ?, ?>)o;
+		else if(o instanceof Triple<?, ?, ?> rightSide){
 			return (a.equals(rightSide.a) && b.equals(rightSide.b) && c.equals(rightSide.c));
 		}
 		else{

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

@@ -51,7 +51,7 @@ public class HexagonalNumberGenerator implements Iterator<Long>{
 	}
 
 	public static boolean isHexagonal(Long x){
-		Long n = Math.round((Math.sqrt(1 + (8 * x)) + 1) / 4);
+		Long n = Math.round((Math.sqrt(1.0 + (8 * x)) + 1) / 4);
 		return ((2 * n * n) - n) == x;
 	}
 }

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

@@ -51,7 +51,7 @@ public class PentagonalNumberGenerator implements Iterator<Long>{
 	}
 
 	public static boolean isPentagonal(Long x){
-		Long n = Math.round((Math.sqrt(1 + (24 * x)) + 1) / 6);
+		Long n = Math.round((Math.sqrt(1.0 + (24 * x)) + 1) / 6);
 		return (((3 * n * n) - n) / 2) == x;
 	}
 }

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

@@ -51,7 +51,7 @@ public class TriangularNumberGenerator implements Iterator<Long>{
 	}
 
 	public static boolean isTriangular(Long x){
-		Long n = Math.round((Math.sqrt(1 + (8 * x)) - 1) / 2);
+		Long n = Math.round((Math.sqrt(1.0 + (8 * x)) - 1) / 2);
 		return (((n * n) + n) / 2) == x;
 	}
 }