MissingInteger Codility Lesson 2

MissingInteger Codility Lesson 2

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