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Java program to find the duplicate words in a string

Java program to find the duplicate words in a string

In this example, we will create a java program to find out the duplicate words present in the string and display those words.

Program:

public class Main 
{    
    public static void main(String[] args) 
	{    
        String string = "Peter Piper picked a peck of pickled peppers.
		A peck of pickled peppers Peter Piper picked If Peter Piper picked a peck of pickled peppers Where’s the peck of pickled peppers Peter Piper picked?";    
        int count;    
            
        string = string.toLowerCase();    
            
        String words[] = string.split(" ");    
            
        System.out.println("Duplicate words in a given string : ");     

        for(int i = 0; i < words.length; i++) 
		{    
            count = 1;    
            for(int j = i+1; j < words.length; j++) 
			{    
                if(words[i].equals(words[j])) 
				{    
                    count++;    
                    words[j] = "0";    
                }    
            }    
                
            if(count > 1 && words[i] != "0")    
                System.out.println(words[i]);    
        }    
    }    
}   

Output
Duplicate words in a given string :
peter
piper
picked
a
peck
of
pickled
peppers

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