Finding Duplicate Characters Using Java - Latest Information & Updates 2026

Web Reference: Jan 16, 2026 · In this blog, we’ll explore three detailed methods to find duplicate characters in a string and count their occurrences: using a HashMap for flexibility, an array for performance with ASCII strings, and Java 8 Streams for concise, modern code. Jul 15, 2025 · Approach: The idea is to do hashing using HashMap. Create a hashMap of type {char, int}. Traverse the string, check if the hashMap already contains the traversed character or not. If it is present, then increment the count or else insert the character in the hashmap with frequency = 1. Java Program to Find Duplicate Characters in a String This Java program is used to find duplicate characters in string.

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Last Updated: April 5, 2026

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