Find Duplicate Characters In String in java


In this core java programming tutorial we will write a program to Find Duplicate Characters In String in java.


Example 1 in java -
inputString is : javamadesoeasy
Output is : aes

Example 2 in java -
inputString is : java
Output is : a

Example 3 in java -
inputString is : ankit
Output is :

Example 4 in java -
inputString is : This is it
Output is : is
Example 5 in java -
inputString is : javaMadeSoEasy.com
Output is : ao

Example/ Program  - Find Duplicate Characters In String in java-
/**
* @author AnkitMittal - Find Duplicate Characters In String in java
*/
public class  FindDuplicateCharacterInString {
  
   public static void main(String[] args) {
      String inputString="javamadesoeasy";
      //String inputString="java"; //Test String
      //String inputString="ankit";  //Test String
      //String inputString="javaMadeSoEasy.com";  //Test String
      //String inputString="This is it";  //Test String
     
       System.out.println("inputString is : "+inputString);
       System.out.print("Output is : ");
       characterCount(inputString);
   }
  
   /**
    * Method calculates count of all characters in inputString.
    */
   public static void characterCount(String inputString){
     
      char[] inputAr=inputString.toCharArray();
      int count=0,arLength;
     
       arLength=inputAr.length;
       for(int x=0; x<arLength; x++){
        char ch=inputAr[x];
        for(int y=x+1; y<arLength; y++){
            if(inputAr[y]==ch){          //if we have find same character again in string
                for(int z=y; z< arLength-1; z++)   //shift characters left.
                inputAr[z]=inputAr[z+1];
                arLength--;   //as characters have been reduce arLength.
                y=x;   //done to tackle case if occurrence of character is more than once in string.
            }
        }
       }
      
       /*
     * Till this point of program, inputAr's first arLength number of elements are unique.
     */
      
       for(int x=0;x<arLength;x++){
          count=0;
       
          for(int y=0; y<inputAr.length; y++){
            if(inputAr[x]==inputString.charAt(y))
            count++;
        }
          if(count >1)
                 System.out.print(inputAr[x]);
       
       }
      
      
   }
  
}
/*
inputString is : javamadesoeasy
Output is : aes
*/


So in this core java programming tutorial we learned how to write a program to Find Duplicate Characters In String in java.



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