String string = "Hai,Hello,How,are,you";

String[] bits = string.split(",");

String lastWord = bits[bits.length - 2];

tvs.setText(lastWord);

​

String string = "Hai,Hello,How,are,";

String[] bits = string.split(",", -1);

　↓

bits[]…{ "Hai","Hello","How","are","" }

bits[bits.length-2]…"are"

​

import java.util.Scanner ;

public class $practice {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in) ;

        String str = sc.nextLine () ;

        int a = 0 ;

        int count = 0 ;

        for(int i = 0 ; i < str.length() ; i ++){

            if(str.charAt(i) == ' '){

                count ++ ;

            }

        }

        System.out.println("count = : "+ count);

​

       int [] arr  = new int [count] ;

        for(int i = 0 ; i < str.length() ; i ++) {

            if(str.charAt(i) == ' '){

                arr[a] = i ;

                a++ ;

            }

        }

        for(int j = 0 ; j < count  ; j ++){

            System.out.println(arr[j] + " ");

        }

        int e = arr[count - 1 ]  ;

        int s = arr[count - 2] + 1 ;

        System.out.println(str.substring(s , e));

    }

}

​