diff --git a/src/test/java/March/DuplicateWordFinder.java b/src/test/java/March/DuplicateWordFinder.java
new file mode 100644
index 0000000..cd67624
--- /dev/null
+++ b/src/test/java/March/DuplicateWordFinder.java
@@ -0,0 +1,18 @@
+package March;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class DuplicateWordFinder {
+	public static void main(String[] args) {
+		String str = "masum raza delhi patna bihar delhi amnour delhi patn";
+		String words[] = str.split(" ");
+		Set<String> uniq = new HashSet<String>();
+		for (String word : words) {
+			uniq.add(word.trim());
+		}
+		for (String word : uniq) {
+			System.out.println(word);
+		}
+	}
+}
diff --git a/src/test/java/March/EvenLetterPrintFromString.java b/src/test/java/March/EvenLetterPrintFromString.java
new file mode 100644
index 0000000..0f3ab98
--- /dev/null
+++ b/src/test/java/March/EvenLetterPrintFromString.java
@@ -0,0 +1,19 @@
+package March;
+
+public class EvenLetterPrintFromString {
+    public static void main(String[] args) {
+        String str = "masumrazadelhi";
+
+        // Remove spaces completely
+        str = str.replace(" ", "");
+
+        // Now count only characters
+        for (int i = 0; i < str.length(); i++) {
+            if (i % 2 == 0) { // even position among letters
+                System.out.print(str.charAt(i) + " ");
+            }
+        }
+    }
+}
+
+//m s m a a e h 
\ No newline at end of file
diff --git a/src/test/java/March/SumOfNumber.java b/src/test/java/March/SumOfNumber.java
new file mode 100644
index 0000000..7b66574
--- /dev/null
+++ b/src/test/java/March/SumOfNumber.java
@@ -0,0 +1,17 @@
+package March;
+
+public class SumOfNumber {
+	public static void main(String[] args) {
+		int num = 00;
+		while (num >= 10) {
+			int sum = 0;
+			while (num > 0) {
+				sum += num % 10;
+				num = num / 10;
+			}
+			num = sum;
+		}
+		System.out.println(num);
+	}
+
+}
diff --git a/src/test/java/codeWithLogicExplanation/FindTheDuplicateNumber.java b/src/test/java/codeWithLogicExplanation/FindTheDuplicateNumber.java
new file mode 100644
index 0000000..63ae404
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/FindTheDuplicateNumber.java
@@ -0,0 +1,50 @@
+package codeWithLogicExplanation;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class FindTheDuplicateNumber {
+
+	public static void main(String[] args) {
+
+		// Integer array with some duplicate values (747 appears multiple times)
+		int ar[] = { 133, 2, 134, 53554, 747, 747, 43634, 747, 86, 346 };
+
+		// Input string converted to lowercase for uniform comparison
+		String input = "India Delhi".toLowerCase();
+
+		// Set to store duplicate numbers
+		Set<Integer> duplicate = new HashSet<>();
+
+		// Set to store unique numbers
+		Set<Integer> uniq = new HashSet<>();
+
+		// Loop through each number in the array
+		for (int num : ar) {
+			// If adding to uniq fails (already exists), add to duplicate
+			if (!uniq.add(num)) {
+				duplicate.add(num);
+			}
+		}
+
+		// Print duplicate numbers
+		System.out.println("duplicate number is : " + duplicate);
+
+		// Set to store unique characters
+		Set<Character> uniqs = new HashSet<>();
+
+		// Set to store duplicate characters
+		Set<Character> duplicates = new HashSet<>();
+
+		// Loop through each character in the string
+		for (char c : input.toCharArray()) {
+			// If adding to uniqs fails (already exists), add to duplicates
+			if (!uniqs.add(c)) {
+				duplicates.add(c);
+			}
+		}
+
+		// Print duplicate characters
+		System.out.println("duplicate charater is : " + duplicates);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/NonRepeatingCharacter.java b/src/test/java/codeWithLogicExplanation/NonRepeatingCharacter.java
new file mode 100644
index 0000000..a1fa268
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/NonRepeatingCharacter.java
@@ -0,0 +1,30 @@
+package codeWithLogicExplanation;
+
+public class NonRepeatingCharacter {
+
+	public static void main(String arg[]) {
+
+		// Input string
+		String input = "masum raza delhi bihar";
+		System.out.print("non repeating character is : ");
+		// Loop through each character
+		for (char c : input.toCharArray()) {
+			// If first and last occurrence of the character are the same,
+			// it means the character appears only once in the string
+			if (input.indexOf(c) == (input.lastIndexOf(c))) {
+				System.out.print(c + " ");
+			}
+		}
+		// Another string to check repeating characters
+		String sc = "bittumasum";
+		System.out.print("\nrepeating character is: ");
+		// Loop through each character
+		for (char d : sc.toCharArray()) {
+			// If first and last occurrence are different,
+			// it means the character appears more than once
+			if (sc.indexOf(d) != (sc.lastIndexOf(d))) {
+				System.out.print(d + " ");
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/PalindromNumber.java b/src/test/java/codeWithLogicExplanation/PalindromNumber.java
new file mode 100644
index 0000000..0e2d2b1
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/PalindromNumber.java
@@ -0,0 +1,24 @@
+package codeWithLogicExplanation;
+
+public class PalindromNumber {
+
+	public static void main(String[] args) {
+
+		int num = 12321; // The number to check
+		int rev = 0; // Variable to store the reversed number
+		int original = num; // Keep a copy of the original number
+
+		// Reverse the number
+		while (num != 0) {
+			rev = rev * 10 + num % 10; // Take last digit and build reversed number
+			num = num / 10; // Remove last digit from num
+		}
+
+		// Compare original with reversed
+		if (original == rev) {
+			System.out.println(original + " number is palindrome");
+		} else {
+			System.out.println(rev + " num is not palindrome");
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/ReversString.java b/src/test/java/codeWithLogicExplanation/ReversString.java
new file mode 100644
index 0000000..1991027
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/ReversString.java
@@ -0,0 +1,19 @@
+package codeWithLogicExplanation;
+
+public class ReversString {
+
+	public static void main(String[] args) {
+
+		String input = "delhi"; // The original string
+		String rev = ""; // Variable to store the reversed string
+		int len = input.length(); // Get the length of the string (5 for "delhi")
+
+		// Loop backwards from last character to first
+		for (int i = len - 1; i >= 0; i--) {
+			rev = rev + input.charAt(i); // Append each character to rev
+		}
+
+		// Print the reversed string
+		System.out.println("reverse string is : " + rev);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/SumOfNumber.java b/src/test/java/codeWithLogicExplanation/SumOfNumber.java
new file mode 100644
index 0000000..1507dac
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/SumOfNumber.java
@@ -0,0 +1,24 @@
+package codeWithLogicExplanation; // Declares the package name (March). Helps organize classes.
+
+public class SumOfNumber { // Defines the class SumOfNumber
+	public static void main(String[] args) { // Main method: program entry point
+		int num = 9876; // Initialize the number you want to process (example: 9876)
+
+		// Outer loop: keep running until num becomes a single digit (<= 9)
+		while (num > 9) {
+			int sum = 0; // Reset sum for this iteration
+
+			// Inner loop: calculate sum of digits of num
+			while (num > 0) {
+				sum += num % 10; // Add last digit to sum
+				num = num / 10; // Remove last digit from num
+			}
+
+			// After summing digits, assign sum back to num
+			num = sum;
+		}
+
+		// Print the final single-digit result
+		System.out.println(num);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/UpperCaseCountInString.java b/src/test/java/codeWithLogicExplanation/UpperCaseCountInString.java
new file mode 100644
index 0000000..7c98803
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/UpperCaseCountInString.java
@@ -0,0 +1,29 @@
+package codeWithLogicExplanation;
+
+public class UpperCaseCountInString {
+
+	public static void main(String[] args) {
+
+		// Input string to check
+		String input = "MaDhUBani";
+
+		// Counter to keep track of uppercase letters
+		int count = 0;
+
+		// Loop through each character in the string
+		for (int i = 0; i <= input.length() - 1; i++) {
+
+			// Get the character at position i
+			char c = input.charAt(i);
+
+			// Check if the character is uppercase
+			if (Character.isUpperCase(c)) {
+				count++; // Increase count if uppercase
+				System.out.println("Upper character is : " + c);
+			}
+		}
+
+		// Print total number of uppercase characters found
+		System.out.println("Total Upper case is : " + count);
+	}
+}
\ No newline at end of file
diff --git a/target/classes/META-INF/maven/com.interviewPractice2026/interviewPractice2026/pom.properties b/target/classes/META-INF/maven/com.interviewPractice2026/interviewPractice2026/pom.properties
index ca7da1e..42fc131 100644
--- a/target/classes/META-INF/maven/com.interviewPractice2026/interviewPractice2026/pom.properties
+++ b/target/classes/META-INF/maven/com.interviewPractice2026/interviewPractice2026/pom.properties
@@ -1,5 +1,5 @@
 #Generated by Maven Integration for Eclipse
-#Sat Feb 28 11:30:55 IST 2026
+#Sun Mar 01 00:25:16 IST 2026
 artifactId=interviewPractice2026
 groupId=com.interviewPractice2026
 m2e.projectLocation=D\:\\My_Project\\Testing_Project\\interviewPractice2026
diff --git a/target/test-classes/March/DuplicateWordFinder.class b/target/test-classes/March/DuplicateWordFinder.class
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diff --git a/target/test-classes/March/EvenLetterPrintFromString.class b/target/test-classes/March/EvenLetterPrintFromString.class
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