Java: Find the index of the first unique character in a given string
Java Basic: Exercise-148 with Solution
First Unique Character Index
Write a Java program to find the index of the first unique character in a given string. Assume that there is at least one unique character in the string.
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.*;
public class Solution {
public static void main(String[] args) {
// Test the first_Uniq_Char function and print the result
String s = "wresource";
System.out.println("Original String: " + s);
System.out.println("First unique character of the above: " + first_Uniq_Char(s));
}
public static int first_Uniq_Char(String s) {
int[] freq = new int[256]; // Create an array to store character frequencies (assuming ASCII characters)
// Count the frequency of each character in the string
for (char c : s.toCharArray()) {
freq[c - 'a']++; // Increment the count at the corresponding index in the array
}
// Iterate through the string to find the index of the first unique character
for (int i = 0; i < s.length(); i++) {
if (freq[s.charAt(i) - 'a'] == 1) {
return i; // Return the index of the first character with a frequency of 1
}
}
return -1; // Return -1 if there are no unique characters
}
}
Sample Output:
Original String: wresource First unique character of the above: 0
Flowchart:
Java Code Editor:
Company: Microsoft Google Bloomberg Amazon
Previous: Write a Java program to find the number of bits required to flip to convert two given integers.
Next: Write a Java program to check if a given string is a permutation of another given string.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.
https://www.w3resource.com/java-exercises/basic/java-basic-exercise-148.php
- Weekly Trends and Language Statistics
- Weekly Trends and Language Statistics