Initial data commit

Task/Factorial-primes/Java/factorial-primes-1.java

@@ -0,0 +1,38 @@
+public class MainApp {
+    public static void main(String[] args) {
+        int countOfPrimes = 0;
+        final int targetCountOfPrimes = 10;
+        long f = 1;
+        while (countOfPrimes < targetCountOfPrimes) {
+            long factorialNum = getFactorial(f);
+            boolean primePlus = isPrime(factorialNum + 1);
+            boolean primeMinus = isPrime(factorialNum - 1);
+            if (primeMinus) {
+                countOfPrimes++;
+                System.out.println(countOfPrimes + ": " + factorialNum + "! - 1 = " + (factorialNum - 1));
+
+            }
+            if (primePlus  && f > 1) {
+                countOfPrimes++;
+                System.out.println(countOfPrimes + ": " + factorialNum + "! + 1 = " + (factorialNum + 1));
+            }
+            f++;
+        }
+    }
+
+    private static long getFactorial(long f) {
+        long factorial = 1;
+        for (long i = 1; i < f; i++) {
+            factorial *= i;
+        }
+        return factorial;
+    }
+
+    private static boolean isPrime(long num) {
+        if (num < 2) {return false;}
+        for (long i = 2; i < num; i++) {
+            if (num % i == 0) {return false;}
+        }
+        return true;
+    }
+}