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  1. import java.util.HashMap;
  2. import java.util.Scanner;
  3.  
  4. /**
  5.  *
  6.  * @author Neelabh
  7.  */
  8. class FirstNonRepeatedCharacter {
  9.     public static void main(String [] args){
  10.         Scanner scan=new Scanner(System.in);
  11.         String string=scan.next();
  12.         int len=string.length();
  13.         HashMap<Character, Integer> hashMap=new HashMap<Character, Integer>();
  14.         //First Scan
  15.         for(int i = 0; i <len;i++){
  16.             char currentCharacter=string.charAt(i);
  17.             if(!hashMap.containsKey(currentCharacter)){
  18.                 hashMap.put(currentCharacter, 1);
  19.             }
  20.             else{
  21.                 hashMap.put(currentCharacter, hashMap.get(currentCharacter)+1);
  22.             }
  23.         }
  24.         // Second Scan
  25.         boolean flag=false;
  26.         char firstNonRepeatingChar = 0;
  27.         for(int i=0;i<len;i++){
  28.                 char c=string.charAt(i);
  29.                 if(hashMap.get(c)==1){
  30.                     flag=true;
  31.                     firstNonRepeatingChar=c;
  32.                     break;
  33.                 }
  34.         }
  35.         if(flag==true)
  36.             System.out.println("firstNonRepeatingChar is "+firstNonRepeatingChar);
  37.         else
  38.             System.out.println("There is no such type of character");
  39.     }    
  40. }
Success #stdin #stdout 0.1s 380736KB
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firstNonRepeatingChar is f
https://ideone.com/amNcli
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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