PermCheck lesson 2 codility

PermCheck lesson 2 codility

import java.util.stream.IntStream;
class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
        if(A.length==0){
         return 0;   
        }
        int[] sorted=IntStream.of(A).sorted().toArray();
        for(int index=0;index<sorted.length;index++){
           int check=index+1;
           if(sorted[index]!=check){
              return 0; 
           }
        }
        
        return 1;
    }
}