Write a Java Program to Find First Repeated And Non-Repeated Character from given String ?

Here we will learn how to find the first non repeated words from the string and first repeated word from the string. For example suppose we have string "teeter" in this string first non repeated word/character is "r" and first repeated word/character is "t". 

Below program shows the logic to find the first non repeated word/character and first repeated word/character with multiple examples.

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import java.util.LinkedHashMap; import java.util.Map; public class FirstNonRepeatedAndRepeatedCharacter { public static void getOutput(String str){ Map<Character, Integer> map = new LinkedHashMap<>(); for(char ch : str.toCharArray()){ if(map.containsKey(ch)){ map.put(ch, map.get(ch)+1); } else{ map.put(ch, 1); } } for(char ch : str.toCharArray()){ if(map.get(ch) == 1){ System.out.println("First Non Repeated Character of String *"+str+"* is : "+ch); break; } } for(char ch : str.toCharArray()){ if(map.get(ch) > 1){ System.out.println("First Repeated Character of String *"+str+"* is : "+ch+"\n"); break; } } } public static void main(String[] args) { FirstNonRepeatedAndRepeatedCharacter.getOutput("JavaConceptOfTheDay"); FirstNonRepeatedAndRepeatedCharacter.getOutput("teeter"); FirstNonRepeatedAndRepeatedCharacter.getOutput("stress"); } }

Output:

First Non Repeated Character of String *JavaConceptOfTheDay* is : J

First Repeated Character of String *JavaConceptOfTheDay* is : a

First Non Repeated Character of String *teeter* is : r

First Repeated Character of String *teeter* is : t

First Non Repeated Character of String *stress* is : t

First Repeated Character of String *stress* is : s

      

Blog Author - Pushkar Khosla,
Software Developer by Profession with 3.0 Yrs of Experience , through this blog i'am sharing my industrial Java Knowledge to entire world. For any question or query any one can comment below or mail me at pushkar.itsitm52@gmail.com.

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