incorporate review comments for BAEL-747 (#1603)

algorithms/src/main/java/com/baeldung/algorithms/primechecker/BigIntegerPrimeChecker.java

@@ -2,10 +2,10 @@ package com.baeldung.algorithms.primechecker;
 
 import java.math.BigInteger;
 
-public class BigIntegerPrimeChecker implements PrimeChecker{
+public class BigIntegerPrimeChecker implements PrimeChecker<Long>{
 
     @Override
-    public boolean isPrime(int number) {
+    public boolean isPrime(Long number) {
         BigInteger bigInt = BigInteger.valueOf(number);
         return bigInt.isProbablePrime(100);
     }

algorithms/src/main/java/com/baeldung/algorithms/primechecker/BruteForcePrimeChecker.java

@@ -1,12 +1,15 @@
 package com.baeldung.algorithms.primechecker;
 
 import java.util.stream.IntStream;
+import java.util.stream.LongStream;
 
-public class BruteForcePrimeChecker implements PrimeChecker{
+public class BruteForcePrimeChecker implements PrimeChecker<Integer>{
 
     @Override
-    public boolean isPrime(int number) {
-        return IntStream.range(2, number).noneMatch(n -> (number % n == 0));
+    public boolean isPrime(Integer number) {
+        
+        return number > 2 ? IntStream.range(2, number)
+            .noneMatch(n -> (number % n == 0)) : false;
     }
 
     

algorithms/src/main/java/com/baeldung/algorithms/primechecker/OptimisedPrimeChecker.java

@@ -1,13 +1,14 @@
 package com.baeldung.algorithms.primechecker;
 
 import java.util.stream.IntStream;
+import java.util.stream.LongStream;
 
-public class OptimisedPrimeChecker implements PrimeChecker{
+public class OptimisedPrimeChecker implements PrimeChecker<Integer>{
 
     @Override
-    public boolean isPrime(int number) {
-        return IntStream.range(2, (int)Math.sqrt(number) + 1)
-            .noneMatch(n -> (number % n == 0));
+    public boolean isPrime(Integer number) {
+        return number > 2 ? IntStream.rangeClosed(2, (int) Math.sqrt(number))
+            .noneMatch(n -> (number % n == 0)) : false;
     }
 
     

algorithms/src/main/java/com/baeldung/algorithms/primechecker/PrimeChecker.java

@@ -1,6 +1,6 @@
 package com.baeldung.algorithms.primechecker;
 
-public interface PrimeChecker {
+public interface PrimeChecker <T> {
     
-    public boolean isPrime( int number );
+    public boolean isPrime( T number );
 }

algorithms/src/main/java/com/baeldung/algorithms/primechecker/PrimesPrimeChecker.java

@@ -2,10 +2,10 @@ package com.baeldung.algorithms.primechecker;
 
 import org.apache.commons.math3.primes.Primes;
 
-public class PrimesPrimeChecker implements PrimeChecker{
+public class PrimesPrimeChecker implements PrimeChecker<Integer>{
 
     @Override
-    public boolean isPrime(int number) {
+    public boolean isPrime(Integer number) {
         return Primes.isPrime(number);
     }