diff --git a/src/test/java/codeWithLogicExplanation/CharacterCount.java b/src/test/java/codeWithLogicExplanation/CharacterCount.java
new file mode 100644
index 0000000..2422ce1
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/CharacterCount.java
@@ -0,0 +1,25 @@
+package codeWithLogicExplanation;
+
+import java.util.HashMap;
+
+public class CharacterCount {
+
+	public static void main(String[] args) {
+
+		// Input string
+		String str = "masum";
+
+		// HashMap to store character as key and its count as value
+		HashMap<Character, Integer> map = new HashMap<>();
+
+		// Loop through each character in the string
+		for (char c : str.toCharArray()) {
+			// getOrDefault(c, 0) returns the current count if present, otherwise 0
+			// Then we add 1 to update the count
+			map.put(c, map.getOrDefault(c, 0) + 1);
+		}
+
+		// Print the final map showing character counts
+		System.out.println(map);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/CharacterCounts.java b/src/test/java/codeWithLogicExplanation/CharacterCounts.java
new file mode 100644
index 0000000..0946395
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/CharacterCounts.java
@@ -0,0 +1,30 @@
+package codeWithLogicExplanation;
+
+import java.util.HashMap;
+
+public class CharacterCounts {
+	public static void main(String[] args) {
+
+		// Input string
+		String str = "masum";
+
+		// HashMap to store character as key and its frequency as value
+		HashMap<Character, Integer> map = new HashMap<>();
+
+		// Loop through each character in the string
+		for (char c : str.toCharArray()) {
+
+			// Check if the character already exists in the map
+			if (map.containsKey(c)) {
+				// If yes, increment its count
+				map.put(c, map.get(c) + 1);
+			} else {
+				// If not, add it with initial count = 1
+				map.put(c, 1);
+			}
+		}
+
+		// Print the final map showing character counts
+		System.out.println(map);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/ExpandString.java b/src/test/java/codeWithLogicExplanation/ExpandString.java
new file mode 100644
index 0000000..3e950b1
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/ExpandString.java
@@ -0,0 +1,22 @@
+package codeWithLogicExplanation;
+
+public class ExpandString {
+	public static void main(String[] args) {
+		String str = "a2b3c4"; // input string with characters followed by numbers
+		String result = ""; // final expanded string
+
+		// Loop through the string in steps of 2 (character + digit)
+		for (int i = 0; i < str.length(); i += 2) {
+			char ch = str.charAt(i); // the character
+			int count = Character.getNumericValue(str.charAt(i + 1)); // the number after character
+
+			// Repeat the character 'count' times
+			for (int j = 1; j <= count; j++) {
+				result = result + ch;
+			}
+		}
+
+		// Print the expanded string
+		System.out.println(result);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/PrimeChecker.java b/src/test/java/codeWithLogicExplanation/PrimeChecker.java
new file mode 100644
index 0000000..61f4161
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/PrimeChecker.java
@@ -0,0 +1,30 @@
+package codeWithLogicExplanation;
+
+public class PrimeChecker {
+
+	public static void main(String[] args) {
+		// Loop through numbers from 1 to 100
+		for (int num = 1; num <= 100; num++) {
+			// Call isPrime() and print result using ternary operator
+			System.out.println(num + " is " + (isPrime(num) ? "Prime" : "Not Prime"));
+		}
+	}
+
+	// Method to check if a number is prime
+	private static boolean isPrime(int num) {
+
+		// Prime numbers are greater than 1
+		if (num <= 1)
+			return false;
+
+		// Check divisibility from 2 up to sqrt(num)
+		// If divisible by any number in this range, it's not prime
+		for (int i = 2; i <= Math.sqrt(num); i++) {
+			if (num % i == 0)
+				return false;
+		}
+
+		// If no divisors found, it's prime
+		return true;
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/ReveseSentnece.java b/src/test/java/codeWithLogicExplanation/ReveseSentnece.java
new file mode 100644
index 0000000..01d1f3f
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/ReveseSentnece.java
@@ -0,0 +1,31 @@
+package codeWithLogicExplanation;
+
+public class ReveseSentnece {
+	public static void main(String[] args) {
+		// Input string where each word is reversed
+		String str = "ihled si latipac fo aidnI";
+
+		// Split the sentence into words using space as delimiter
+		String words[] = str.split(" ");
+
+		// Variable to store the final reversed sentence
+		String revSen = "";
+
+		// Loop through each word
+		for (String word : words) {
+			String revWord = ""; // to store reversed word
+			int len = word.length();
+
+			// Reverse the current word character by character
+			for (int i = len - 1; i >= 0; i--) {
+				revWord = revWord + word.charAt(i);
+			}
+
+			// Add the reversed word to the sentence
+			revSen = revSen + revWord + " ";
+		}
+
+		// Print the final reversed sentence (trim removes extra space at the end)
+		System.out.println(revSen.trim());
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/SecondHigherNumInArray.java b/src/test/java/codeWithLogicExplanation/SecondHigherNumInArray.java
new file mode 100644
index 0000000..c1f5407
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/SecondHigherNumInArray.java
@@ -0,0 +1,28 @@
+package codeWithLogicExplanation;
+
+public class SecondHigherNumInArray {
+
+	public static void main(String[] args) {
+
+		int arr[] = { 112, 34, 553, 35, 23, 678, 876, 366, 53, 757, 3425, 4444 };
+
+		int first = Integer.MIN_VALUE; // highest number
+		int second = Integer.MIN_VALUE; // second highest number
+
+		// Loop through each number in the array
+		for (int num : arr) {
+			if (num > first) {
+				// If current number is greater than first,
+				// then update second as old first, and first as current number
+				second = first;
+				first = num;
+			} else if (num > second && num != first) {
+				// If current number is greater than second but not equal to first,
+				// update second
+				second = num;
+			}
+		}
+
+		System.out.println("Second highest number is : " + second);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/StringCompresssed.java b/src/test/java/codeWithLogicExplanation/StringCompresssed.java
new file mode 100644
index 0000000..8e7334c
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/StringCompresssed.java
@@ -0,0 +1,26 @@
+package codeWithLogicExplanation;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class StringCompresssed {
+	public static void main(String[] args) {
+		String str = "aaaaaaggggg"; // input string
+		String result = "";
+
+		// LinkedHashMap preserves insertion order
+		Map<Character, Integer> charc = new LinkedHashMap<>();
+
+		// Count frequency of each character
+		for (char c : str.toCharArray()) {
+			charc.put(c, charc.getOrDefault(c, 0) + 1);
+		}
+
+		// Build compressed string
+		for (Map.Entry<Character, Integer> entry : charc.entrySet()) {
+			result = result + entry.getKey() + entry.getValue();
+		}
+
+		System.out.println(result);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/VowelLetterCount.java b/src/test/java/codeWithLogicExplanation/VowelLetterCount.java
new file mode 100644
index 0000000..cfca4ba
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/VowelLetterCount.java
@@ -0,0 +1,30 @@
+package codeWithLogicExplanation;
+
+public class VowelLetterCount {
+
+	public static void main(String[] args) {
+
+		// Input string
+		String input = "rajuiUmbrela";
+
+		// String containing all vowels (both uppercase and lowercase)
+		String vowel = "AEIOUaeiou";
+
+		// Counter to keep track of vowels
+		int count = 0;
+
+		// Loop through each character of the input string
+		for (char c : input.toCharArray()) {
+
+			// Check if the character exists in the vowel string
+			// indexOf(c) returns -1 if the character is not found
+			if (vowel.indexOf(c) != -1) {
+				count++; // Increase count if vowel found
+				System.out.print(c+" "); // Print the vowel character
+			}
+		}
+
+		// Print total number of vowels found
+		System.out.println("\ntotal number of vowels found: "+count);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/WhiteSpaceAndWordCount.java b/src/test/java/codeWithLogicExplanation/WhiteSpaceAndWordCount.java
new file mode 100644
index 0000000..ad45de2
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/WhiteSpaceAndWordCount.java
@@ -0,0 +1,31 @@
+package codeWithLogicExplanation;
+
+public class WhiteSpaceAndWordCount {
+	public static void main(String[] args) {
+		String str = "hell      aa ad ddsa ddd dd";
+
+		// Count spaces
+		int count = 0;
+		for (int i = 0; i <= str.length() - 1; i++) {
+			if (str.charAt(i) == ' ') {
+				count++;
+			}
+		}
+		System.out.println("Total white space count is : " + count);
+
+		// Count words
+		int wordCount = 0;
+		for (int j = 0; j <= str.length() - 2; j++) { // avoid index out of bounds
+			// If current char is space AND next char is not space,
+			// it means a word has ended
+			if (str.charAt(j) == ' ' && str.charAt(j + 1) != ' ') {
+				wordCount++;
+			}
+		}
+
+		// Add 1 to count the first word (since loop only counts transitions)
+		wordCount++;
+
+		System.out.println("Total word Count is : " + wordCount);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/WhiteSpaceCount.java b/src/test/java/codeWithLogicExplanation/WhiteSpaceCount.java
new file mode 100644
index 0000000..39fa5aa
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/WhiteSpaceCount.java
@@ -0,0 +1,25 @@
+package codeWithLogicExplanation;
+
+public class WhiteSpaceCount {
+
+	public static void main(String[] args) {
+
+		// Input string with spaces
+		String input = "India is  a big country";
+
+		// Counter to keep track of spaces
+		int count = 0;
+
+		// Loop through each character in the string
+		for (int i = 0; i <= input.length() - 1; i++) {
+
+			// Check if the current character is a space
+			if (input.charAt(i) == ' ') {
+				count++; // Increase count if space found
+			}
+		}
+
+		// Print total number of spaces
+		System.out.println(count);
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/WordCountExample.java b/src/test/java/codeWithLogicExplanation/WordCountExample.java
new file mode 100644
index 0000000..2a97418
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/WordCountExample.java
@@ -0,0 +1,35 @@
+package codeWithLogicExplanation;
+
+import java.util.HashMap;
+
+public class WordCountExample {
+
+	public static void main(String[] args) {
+
+		// Input sentence
+		String sentence = "Interview with aditya CGO Interview";
+
+		// Convert to lowercase and split by spaces
+		String[] words = sentence.toLowerCase().split(" ");
+
+		// HashMap to store word as key and frequency as value
+		HashMap<String, Integer> wordCount = new HashMap<>();
+
+		// Loop through each word
+		for (String word : words) {
+			// Check if the word already exists in the map
+			if (wordCount.containsKey(word)) {
+				// If yes, increment its count
+				wordCount.put(word, wordCount.get(word) + 1);
+			} else {
+				// If not, add it with initial count = 1
+				wordCount.put(word, 1);
+			}
+		}
+
+		// Print each word and its frequency
+		for (String word : wordCount.keySet()) {
+			System.out.println(word + ": " + wordCount.get(word));
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/test/java/codeWithLogicExplanation/WordDublicate.java b/src/test/java/codeWithLogicExplanation/WordDublicate.java
new file mode 100644
index 0000000..251b2f6
--- /dev/null
+++ b/src/test/java/codeWithLogicExplanation/WordDublicate.java
@@ -0,0 +1,26 @@
+package codeWithLogicExplanation;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class WordDublicate {
+	public static void main(String[] args) {
+		String Str = "hello ram delhi patna bihar delhi patna bihar";
+
+		// Split the sentence into words
+		String[] words = Str.split(" ");
+
+		// HashSet to store unique words
+		Set<String> uniq = new HashSet<>();
+
+		// Add each word to the set
+		for (String word : words) {
+			uniq.add(word.trim()); // trim removes any accidental spaces
+		}
+
+		// Print unique words
+		for (String word : uniq) {
+			System.out.println(word);
+		}
+	}
+}
\ 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 42fc131..a1b9187 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
-#Sun Mar 01 00:25:16 IST 2026
+#Sun Mar 01 00:47:00 IST 2026
 artifactId=interviewPractice2026
 groupId=com.interviewPractice2026
 m2e.projectLocation=D\:\\My_Project\\Testing_Project\\interviewPractice2026
diff --git a/target/test-classes/codeWithLogicExplanation/CharacterCount.class b/target/test-classes/codeWithLogicExplanation/CharacterCount.class
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diff --git a/target/test-classes/codeWithLogicExplanation/PrimeChecker.class b/target/test-classes/codeWithLogicExplanation/PrimeChecker.class
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diff --git a/target/test-classes/codeWithLogicExplanation/ReveseSentnece.class b/target/test-classes/codeWithLogicExplanation/ReveseSentnece.class
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diff --git a/target/test-classes/codeWithLogicExplanation/SecondHigherNumInArray.class b/target/test-classes/codeWithLogicExplanation/SecondHigherNumInArray.class
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diff --git a/target/test-classes/codeWithLogicExplanation/WhiteSpaceAndWordCount.class b/target/test-classes/codeWithLogicExplanation/WhiteSpaceAndWordCount.class
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diff --git a/target/test-classes/codeWithLogicExplanation/WordCountExample.class b/target/test-classes/codeWithLogicExplanation/WordCountExample.class
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diff --git a/target/test-classes/codeWithLogicExplanation/WordDublicate.class b/target/test-classes/codeWithLogicExplanation/WordDublicate.class
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