Question

How to determine if a string has all unique characters in Java

Answer 1

public class MyClass {
    static boolean count_unique_char(String s) {
        int[] ascii = new int[256];
        int size = s.length();
       
        for (int i = 0; i < size; i++) {
            ascii[s.charAt(i)] += 1;
            if (ascii[s.charAt(i)] > 1)
                return false;
        }
 
        return true;
    }
    public static void main(String args[]) {
        String s = "java python";

        System.out.println(count_unique_char(s));
    }
}

  
   
   
   
   
/*
run:
   
false
   
*/

 

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