/* Implement an algorithm to determine if a string has all unique characters */ package interview.java.arrays; public class unique_string { public static void main(String[] args) { String text = "abcdea"; if (is_string_unique(text)) System.out.println("Yes, " + text + " is unque!"); else System.out.println("Bummer! " + text + " is not unique!"); } public static boolean is_string_unique(String str) { int[] char_freq = new int[256]; for (int i = 0; i < str.length(); i++) { char char_letter = str.charAt(i); int int_letter = Character.getNumericValue(char_letter); int base = Character.getNumericValue('a'); if (char_freq[int_letter - base] != 0) return false; else char_freq[int_letter - base] = 1; } return true; } }