The statement: char [] inp = str.toCharArray(); is used to convert the given string to character array with the name inp using the predefined method toCharArray(). The System.out.println is used to display the message "Duplicate Characters are as given below:".

Aug 7, 2022 · Approach: The idea is to do hashing using HashMap. Create a hashMap of type {char, int}. Traverse the string, check if the hashMap already contains the traversed character or not. If it is present, then increment the count or else insert the character in …

Oct 28, 2011 · Rather than use a regular expression, you can use the index: i to index into the String and read a particular character using charAt(int). You then need a data structure to keep track of the number of occurences of each character.

Java 8 has a new String.chars() method which returns a stream of characters in the String. You can use stream operations to filter out the duplicate characters like so:

You can use Character#isAlphabetic method for that. If it is an alphabet , increase its count in the Map . If the character is not already in the Map then add it with a count of 1 .

Mar 10, 2020 · In this article, We'll learn how to find the duplicate characters in a string using a java program. This java program can be done using many ways. But, we will focus on using the Brute-force search approach, HashMap or LinkedHashMap, Java 8 …

Feb 12, 2024 · In this article we have given a string, the task is to remove duplicates from it. Example. This approach uses a for loop to check for duplicate characters, the code checks for the presence of spaces and non-space characters.

In this program, we need to find the duplicate characters in the string. To find the duplicate character from the string, we count the occurrence of each character in the string. If count is greater than 1, it implies that a character has a duplicate entry in the string.

Sep 26, 2023 · This article presents a simple Java program to find duplicate characters in a String. You can modify the code to find non-repeated characters in string.

This Java program effectively identifies duplicate characters in a string using a HashMap to track character frequencies. By counting the occurrences of each character and then filtering out those with a frequency greater than 1, the program efficiently finds and displays any duplicates.