How to Check if an Array Contain Duplicate In Java?

Hello All, 

Here the coding snippet to check duplicate in array. I used char[] to check the duplicate character check in a string. 

private static void findDuplicate(String input){
    char[] strChar = input.toCharArray();
    boolean haveDuplicate = false;
    for(int i = 0 ; i < input.length(); i++){
        for(int j = i+1 ; j < input.length(); j++){
            if(strChar[i] == strChar[j]){
                haveDuplicate = true;
                System.out.print(strChar[i]);
            }
        }
    }
    if(!haveDuplicate){
        System.out.println("No duplicate found in array");
    }
}

Let pass input as "Java".

Output : a

Pass input as "Python"

Output : No duplicate found in array