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. Write a Java Program to Count Array Duplicates with an example. Or how to write a Java Program to find and count the duplicates in a given array. You can use Character#isAlphabetic method for that. If it is an alphabet, increase its count in the Map. If the character is not already in the Map then add it with a count of 1. NOTE: - Character.isAlphabetic method is new in Java 7. If you are using an older version, you should use Character#isLetter
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