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Java Strings Coding Practice Problems

Last Updated : 23 Jul, 2025

Strings are a fundamental part of Java programming, used for handling and manipulating textual data efficiently. This collection of Java string practice problems covers key operations such as finding string length, slicing, case conversion, palindrome checking, anagram detection, and pattern matching. These exercises will strengthen your understanding of string manipulation techniques, improve problem-solving skills, and prepare you for coding interviews.

Java Strings Practice Questions

  1. Length of String
  2. Count Words in String
  3. Slice The String
  4. Change Case
  5. Print Alphabets
  6. Pangram Checking
  7. Find one extra character
  8. Anagram
  9. Check Palindrome
  10. Reverse String
  11. Decimal number to binary number
  12. Binary number to decimal number
  13. Find Pattern
  14. Almost Equal
  15. Consonants and Vowels Check
  16. The Pattern Matcher
  17. Strings Rotations of Each Other

String Operations Overview

  • String Length: Measure the number of characters in a string.
  • Word Count: Determine the number of words in a string.
  • Slicing Strings: Extract specific parts of a string using substrings.
  • Case Conversion: Convert strings between uppercase and lowercase.
  • Alphabet Printing: Generate sequences of letters programmatically.
  • Pangram Checking: Verify if a sentence contains every letter of the alphabet.
  • Extra Character Detection: Identify an extra character in a given string.
  • Anagram Check: Determine if two strings contain the same characters in a different order.
  • Palindrome Check: Verify if a string reads the same forward and backward.
  • String Reversal: Reverse a string using different techniques.
  • Number Conversions: Convert between decimal and binary representations.
  • Pattern Matching: Find patterns or substrings within a given string.
  • String Rotations: Check if two strings are rotations of each other.

Mastering Java string operations is essential for handling textual data efficiently, solving algorithmic challenges, and preparing for technical interviews. Practicing these Java string coding problems will help improve pattern recognition, data manipulation, and string-based algorithm skills in real-world applications.

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