JAVA | Program to find duplicate words in a String

In this program, we need to find out the duplicate words present in the string and display those words.

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IMPLEMENTATION:

1. Lets start with creating class and main class under it.

public class DuplicateCharacters
{
   public static void main(String[] args)
   {

2. Now define String using auto generated method and also define integer count and initialize it with zero.

String str = new String("Programmers door");
int count=0;

3. After this lets create a character array to convert our string variable to the character.

char[] chars=str.toCharArray();

4.Now lets create for loops for comparing characters and if two characters of consecutive index match, then we will print that character and the counter will be incremented by 1 after each iteration.

System.out.println("Duplicate characters are:");
for (int i=0; i<str.length();i++) 
  {
    for(int j=i+1; j<str.length();j++)
       {
          if (chars[i] == chars[j]) 
          {                                      
             System.out.println(chars[j]);
             count++;
             break;
          }
       }
  }
}

OUTPUT:

Duplicate characters are:
r
o
r
m
r
o

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Happy Coding!

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