【CareerCup】Chapter 1 | Arrays and Strings

1.1 Implement an algorithm to determine if a string has all unique characters. What if you can not use additional data structures?

 1 //1.1 
 2 //Implement an algorithm to determine if a string has all unique characters. 
 3 //What if you can not use additional data structures?
 4 import java.util.*;
 5 public class Chaper1_1 {
 6     public static void main(String[] args){
 7     int count =1;
 8     Scanner input=new Scanner(System.in);
 9     System.out.println("Input the String: ");
10     String check = input.next();
11     byte[] srtbyte = check.getBytes();
12     for (int i=0;i<=srtbyte.length-1;i++){
13         for(int j=i+1;j<=srtbyte.length-1;j++){
14             if(srtbyte[i]==srtbyte[j]){
15                 System.out.println("The string doesn't have all unique characters.");
16                 count = 0;
17             }
18         }
19     }
20     if (count!=0) System.out.println("The string has all unique characters");
21     }
22     
23 }