Question

How to check if a string contains only unique characters in Java

Answer 1

import java.util.*; 

public class MyClass {
    static boolean contains_unique_chars(String s) { 
        char[] arr = s.toCharArray(); 
  
        Arrays.sort(arr); 
  
        for (int i = 0; i < arr.length - 1; i++) { 
            if (arr[i] == arr[i + 1]) 
                return false; 
        } 
        return true; 
    } 
    public static void main(String args[]) {
        String s = "abcde"; 
    
        if (contains_unique_chars(s)) { 
            System.out.println("yes");
        } 
        else { 
            System.out.println("no");
        } 
    }
}

 

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