Interview Yatra

Top 20 Java Interview Questions and Answers for Freshers (2025 Edition) Preparing for your first Java interview can feel overwhelming. To help you, we’ve compiled the top 20 most frequently asked Java interview questions with expanded answers. These cover core concepts and practical knowledge that every fresher should be confident about. Part 1: Core Java Basics 1. What is Java? Java is a high-level, object-oriented, platform-independent programming language developed by Sun Microsystems (now owned by Oracle). Its key philosophy is “write once, run anywhere,” meaning code compiled into bytecode can run on any system that has the Java Virtual Machine (JVM). Java is widely used for web applications, enterprise systems, Android development, and cloud solutions because of its scalability, security, and community support. 2. What are the main features of Java? Java provides several powerful features: Platform Independence: Programs run across operating systems without recompilation. ...

Java String Coding Questions – Part 2 Top 15 Java String Coding Interview Questions – Part 2 1. Reverse a String Using Recursion public class ReverseRecursively { public static String reverse(String str) { if (str.isEmpty()) return str; return reverse(str.substring(1)) + str.charAt(0); } public static void main(String[] args) { System.out.println(reverse("Interview")); } } 2. Find All Permutations of a String public class StringPermutations { public static void permute(String str, String ans) { if (str.length() == 0) { System.out.println(ans); return; } for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); String ros = str.substring(0, i) + str.substring(i + 1); permute(ros, ans + ch); } } public static void main(String[] args) { permute("abc", "...

Top 15 Java String Coding Interview Questions Top 15 Java String Coding Interview Questions (With Answers) 1. Reverse a String public class ReverseString { public static void main(String[] args) { String input = "InterviewYatra"; String reversed = ""; for (int i = input.length() - 1; i >= 0; i--) { reversed += input.charAt(i); } System.out.println("Reversed: " + reversed); } } 2. Check if a String is a Palindrome public class PalindromeCheck { public static boolean isPalindrome(String str) { int i = 0, j = str.length() - 1; while (i < j) { if (str.charAt(i++) != str.charAt(j--)) return false; } return true; } public static void main(String[] args) { System.out.println(isPalindrome("madam")); // true } } 3. Count Vowels and Consonants public ...