Update

src/finalexam/StandardIO/DateCalculation.java

@@ -20,7 +20,7 @@ public class DateCalculation {
         System.out.println(ans);
     }
 
-    public static boolean isLeapYear(int year) {
+    static boolean isLeapYear(int year) {
         return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
     }
 }

src/finalexam/StandardIO/PrimeNumbers.java

@@ -30,4 +30,4 @@ public class PrimeNumbers {
         }
         return true;
     }
-}
+}

src/finalexam/StandardIO/SecurePasswordSpecification.java

@@ -9,7 +9,7 @@ public class SecurePasswordSpecification {
         System.out.println(isSafePassword(s) ? "success" : "fail");
     }
 
-    private static boolean isSafePassword(String password) {
+    static boolean isSafePassword(String password) {
         if (password.length() < 6 || password.length() > 12)
             return false;
         boolean haveLower = false, hasUpper = false, haveDigit = false, hasWhitespace = false;
@@ -25,4 +25,4 @@ public class SecurePasswordSpecification {
         }
         return haveLower && hasUpper && haveDigit && !hasWhitespace;
     }
-}
+}

src/finalexam/StandardIO/SumInReverseOrder.java

@@ -3,7 +3,14 @@ package finalexam.StandardIO;
 import java.util.Scanner;
 
 public class SumInReverseOrder {
-    private static int reverse(int n) {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n1 = sc.nextInt();
+        int n2 = sc.nextInt();
+        System.out.println(reverse(n1) + reverse(n2));
+    }
+
+    static int reverse(int n) {
         int rev = 0;
         while (n > 0) {
             rev = rev * 10 + n % 10;
@@ -11,11 +18,4 @@ public class SumInReverseOrder {
         }
         return rev;
     }
-
-    public static void main(String[] args) {
-        Scanner sc = new Scanner(System.in);
-        int n1 = sc.nextInt();
-        int n2 = sc.nextInt();
-        System.out.println(reverse(n1) + reverse(n2));
-    }
 }