Java Program to Search Duplicate Words in the String

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Table Of Contents
  1. Algorithm/Program Explanation
  2. Program
  3. Related Topics

In this Program we are going to Search Duplicate Words in the Given String and Thus Display those words.

Lets Take Example: Welcome to Noteshacker Noteshacker name is good. here Duplicate word is “Noteshacker” and count is 3

For Finding Duplicate Words in a given String,First we have to Split String into Words and then check for duplicate words.

If count >1 then we got duplicate word print the given word along with its counter value.

Algorithm/Program Explanation

  1. Start
  2. Take String Input String s1.
  3. Split the String into words
  4. Define int count =1.
  5. Define and initialize Two For Loop
    • for(int i=0;i<split.length;i++)
    • for(int j=i+1;j<split.length;j++)
    • Check for Conditions
      • if(split[i].equals(split[j]))
      • count=count+1;
      • split[j]=” # “;//Replacing Repeated by #
    • Check for Conditions
      • if(split[i] !=”#”)
      • print( split[i]+ ” Count =” + count)
  6. End

Program

/*
Java Program To Count Duplicate Words */
import java.util.*;
public class count{


    public static void main(String args[]){
        String s1="Welcome to Noteshacker Noteshacker Noteshacker";//String Input
        String split[]=s1.split(" ");// Splitting String into Words
  int count=1;
  for(int i=0;i<split.length;i++){
      for(int j=i+1;j<split.length;j++){
          if(split[i].equals(split[j])){
              count=count+1;
              split[j]=" # ";//Replacing Repeated by #
          }
      }
      if(split[i] !="#"&& count>1)//printing only Duplicate words
{
          System.out.println( split[i]+ " Count =" + count);
 count=1;
      }
  }
    }
}

Output:
 Duplicate Words in String=Noteshacker =3
 Duplicate Words in String= #  =2// this of no use

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