Remove duplicate Words from a STRING

 package collectionPrograms;

public class RemoveDuplicatesWithoutHM {

public static void main(String[] args) {

// Declare all variables

String str, rs = "";

String Words[];

str ="I am I am a good girl when I am good" ;

str = str.toLowerCase();  //convert to lower case

// Split the given sentence to get each word as String array

Words = str.split(" ");

// Use for loop to remove duplicate words

for(int i=0; i<Words.length; i++) {

for(int j=i+1; j<Words.length; j++) {

if(Words[i].equals(Words[j])) {

Words[j] = "remove";

}

}

}

// Convert to String

for(String word: Words) {

if(word != "remove") {

rs = rs + word + " ";

}

}

// Display given String after removing duplicates

System.out.println("\nSentence after removing duplicate words: " + rs);

}

}