Find Duplicate Characters in a String : Java Code

Given an input string, Write a java code to find duplicate characters in a String. In this tutorial, I am going to explain multiple approaches to find duplicate characters in a string.

For example :

Input string: “Java”
Duplicate character : a

Input string: “programming”
Duplicate character : m,g,r

Find Duplicate Characters in a String

Find Duplicate Characters in a String

Find Duplicate Characters in a String using HashMap

In this example, I have explained how we can print duplicate characters of a string using HashMap. In a Map, we can store character and it’s count. Once we know the number of times each character present in a string. Then we can easily print the duplicate character (Character whose character count is greater than 1).

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Find Duplicate Characters in a String using Set

In this example, we are going to use set data structure. A set doesn’t contain duplicate element. Using this property we can easily find duplicate characters.

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Video Tutorial: Find Duplicate Characters in a String

In this video tutorial, I have explained multiple approaches to find duplicate characters.

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