To find the duplicate characters in a string in Java

Algorithm
1)Define a string.
2)Two loops will be used to find the duplicate characters. Outer loop will be used to select a character and initialize variable count by 1.
3)Inner loop will compare the selected character with rest of the characters present in the string.
4)If a match found, it increases the count by 1 and set the duplicates of selected character by '0' to mark them as visited.
5)After inner loop, if count of character is greater than 1, then it has duplicates in the string.

The java string toCharArray() method converts the given string into a sequence of characters. The returned array length is equal to the length of the string.

The length variable is applicable to an array but not for string objects whereas the length() method is applicable for string objects but not for arrays.

// length can be used for int[], double[], String[]
// to know the length of the arrays.

// length() can be used for String, StringBuilder, etc
// String class related Objects to know the length of the String
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