Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Thursday Code Puzzler: Find the First Character That Appears Once

DZone's Guide to

Thursday Code Puzzler: Find the First Character That Appears Once

· Java Zone ·
Free Resource

The CMS developers love. Open Source, API-first and Enterprise-grade. Try BloomReach CMS for free.

Thursday is code puzzler day here at DZone. The idea is simple: solve the coding problem as efficiently as you can, in any language or framework that you find suitable.

Note: Even though there really is nothing stopping you from finding a solution to this on the internet, try to keep honest, and come up with your own answer.  It's all about the participation!

Do you have code puzzlers that you'd like to share with the DZone community?  If so, please submit here. 

Find the First Character That Appears Once

Write a  method that takes a string, and returns the first character with only one occurrence in the string. For example, if the input was "this is DZone's Thursday Code Puzzler" it would return n. Have fun, and keep it efficient!

Catch up on all our previous puzzlers here.

 

BloomReach CMS: the API-first CMS of the future. Open-source & enterprise-grade. - As a Java developer, you will feel at home using Maven builds and your favorite IDE (e.g. Eclipse or IntelliJ) and continuous integration server (e.g. Jenkins). Manage your Java objects using Spring Framework, write your templates in JSP or Freemarker. Try for free.

Topics:

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}