The difference between.Split (",", -1) and.Split (",")

There is only one difference

1、 When the last bit of the string has a value , There is no difference between the two

2、 When the last bit of the string perhaps N When bit is a separator , The former will not continue to segment , The latter continues to segment . That is, the former is not reserved null value , The latter is reserved .

give an example ：

import java.util.*;

public class Main {

    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        while(sc.hasNext()){
            int sum = 0;
            String s = sc.nextLine();
            String[] str =  s.split("\\.",-1);
            for(int i=0; i<str.length; i++){
                System.out.println(str[i]);
            }
        }
    }
}

Input ：

 Henan .. hebei .

If it is split（“\.”,-1）, The output ：

If yes, if yes split（“\.”）, Output ：

Be careful , Empty strings in the middle are not ignored

Be careful , Need to escape （\） The characters of Yes ：" | " ^ " * " . " + "

Be careful ： " , " There is no need to escape