diff --git a/bin/assignment1/Encrypt.class b/bin/assignment1/Encrypt.class
new file mode 100644
index 0000000..0534bfd
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diff --git a/bin/assignment1/PasswordChange.class b/bin/assignment1/PasswordChange.class
new file mode 100644
index 0000000..6337800
Binary files /dev/null and b/bin/assignment1/PasswordChange.class differ
diff --git a/bin/assignment1/ProductAdditionAndInquiry.class b/bin/assignment1/ProductAdditionAndInquiry.class
new file mode 100644
index 0000000..21d8df9
Binary files /dev/null and b/bin/assignment1/ProductAdditionAndInquiry.class differ
diff --git a/bin/assignment1/UserLogin.class b/bin/assignment1/UserLogin.class
new file mode 100644
index 0000000..453b228
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diff --git a/bin/excel/Test.class b/bin/excel/Test.class
new file mode 100644
index 0000000..a9777cc
Binary files /dev/null and b/bin/excel/Test.class differ
diff --git a/bin/finalexam/StandardIO/DateCalculation.class b/bin/finalexam/StandardIO/DateCalculation.class
new file mode 100644
index 0000000..53f2ed7
Binary files /dev/null and b/bin/finalexam/StandardIO/DateCalculation.class differ
diff --git a/bin/finalexam/StandardIO/DateFormatOutput.class b/bin/finalexam/StandardIO/DateFormatOutput.class
new file mode 100644
index 0000000..0bd9754
Binary files /dev/null and b/bin/finalexam/StandardIO/DateFormatOutput.class differ
diff --git a/bin/finalexam/StandardIO/Encryption.class b/bin/finalexam/StandardIO/Encryption.class
new file mode 100644
index 0000000..27adc83
Binary files /dev/null and b/bin/finalexam/StandardIO/Encryption.class differ
diff --git a/bin/finalexam/StandardIO/Expressions.class b/bin/finalexam/StandardIO/Expressions.class
new file mode 100644
index 0000000..9428481
Binary files /dev/null and b/bin/finalexam/StandardIO/Expressions.class differ
diff --git a/bin/finalexam/StandardIO/FileIO.class b/bin/finalexam/StandardIO/FileIO.class
new file mode 100644
index 0000000..de680b8
Binary files /dev/null and b/bin/finalexam/StandardIO/FileIO.class differ
diff --git a/bin/finalexam/StandardIO/Goods.class b/bin/finalexam/StandardIO/Goods.class
new file mode 100644
index 0000000..9238a2d
Binary files /dev/null and b/bin/finalexam/StandardIO/Goods.class differ
diff --git a/bin/finalexam/StandardIO/PrimeNumbers.class b/bin/finalexam/StandardIO/PrimeNumbers.class
new file mode 100644
index 0000000..ccdcb20
Binary files /dev/null and b/bin/finalexam/StandardIO/PrimeNumbers.class differ
diff --git a/bin/finalexam/StandardIO/SecurePasswordSpecification.class b/bin/finalexam/StandardIO/SecurePasswordSpecification.class
new file mode 100644
index 0000000..0838367
Binary files /dev/null and b/bin/finalexam/StandardIO/SecurePasswordSpecification.class differ
diff --git a/bin/finalexam/StandardIO/StatisticsOfProducts.class b/bin/finalexam/StandardIO/StatisticsOfProducts.class
new file mode 100644
index 0000000..5a4bfc7
Binary files /dev/null and b/bin/finalexam/StandardIO/StatisticsOfProducts.class differ
diff --git a/bin/finalexam/StandardIO/StringInitialization.class b/bin/finalexam/StandardIO/StringInitialization.class
new file mode 100644
index 0000000..1c404e4
Binary files /dev/null and b/bin/finalexam/StandardIO/StringInitialization.class differ
diff --git a/bin/finalexam/StandardIO/SumInReverseOrder.class b/bin/finalexam/StandardIO/SumInReverseOrder.class
new file mode 100644
index 0000000..08ac167
Binary files /dev/null and b/bin/finalexam/StandardIO/SumInReverseOrder.class differ
diff --git a/bin/finalexam/StandardIO/question.txt b/bin/finalexam/StandardIO/question.txt
new file mode 100644
index 0000000..3b5ce08
--- /dev/null
+++ b/bin/finalexam/StandardIO/question.txt
@@ -0,0 +1,5 @@
+add(1,2)
+sub(4.5,2)
+max(7.5,2)
+min(5,3)
+doubleMe(3.5)
\ No newline at end of file
diff --git a/src/finalexam/StandardIO/DateCalculation.java b/src/finalexam/StandardIO/DateCalculation.java
index 0cddf48..1489676 100644
--- a/src/finalexam/StandardIO/DateCalculation.java
+++ b/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;
     }
 }
diff --git a/src/finalexam/StandardIO/PrimeNumbers.java b/src/finalexam/StandardIO/PrimeNumbers.java
index 13792ca..750fc21 100644
--- a/src/finalexam/StandardIO/PrimeNumbers.java
+++ b/src/finalexam/StandardIO/PrimeNumbers.java
@@ -30,4 +30,4 @@ public class PrimeNumbers {
         }
         return true;
     }
-}
\ No newline at end of file
+}
diff --git a/src/finalexam/StandardIO/SecurePasswordSpecification.java b/src/finalexam/StandardIO/SecurePasswordSpecification.java
index 22bdab5..b4b740e 100644
--- a/src/finalexam/StandardIO/SecurePasswordSpecification.java
+++ b/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;
     }
-}
\ No newline at end of file
+}
diff --git a/src/finalexam/StandardIO/SumInReverseOrder.java b/src/finalexam/StandardIO/SumInReverseOrder.java
index 9f73ede..eafb5fd 100644
--- a/src/finalexam/StandardIO/SumInReverseOrder.java
+++ b/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));
-    }
 }