First Non-Repeating Character Using ASCII | Java

First Non-Repeating Character Using ASCII | Java

In this video, I explain how to find the first non-repeating character in a string using ASCII values in Java, without using HashMap.

You will learn:

What is ASCII value and why it is important

How characters are stored as numbers

How to convert a character into an array index using ASCII

Why we use array size 26 for lowercase letters

Step-by-step frequency count using ASCII

How to find the first non-repeating character

Complete Java code with dry run explanation

This approach is:

✔ Beginner-friendly

✔ Interview-oriented

✔ Time Complexity: O(n)

✔ Space Complexity: O(1)

📌 This concept is very useful for:

String problems

DSA preparation

Coding interviews

Java beginners

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#ASCIIValue #Java #DSA #StringProblems #CodingForBeginners #JavaInterview

Видео First Non-Repeating Character Using ASCII | Java канала Chandan Coding & Learning