Reverse each word in sentence without changing position of word (Program_7 by School)

 package School;

import java.util.Scanner;
import java.util.StringTokenizer;

public class Program_7 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter Sentence");
        String sentence = in.nextLine();
        sentence = sentence.toUpperCase();
        String store="";

        if (sentence.endsWith(".") || sentence.endsWith("!") || sentence.endsWith("?")){
            sentence = sentence.substring(0, sentence.length() - 1);
            StringTokenizer st = new StringTokenizer(sentence);
            while (st.hasMoreTokens()){
                store=st.nextToken();
                for (int i=store.length()-1;i>=0;i--){
                    System.out.print(store.charAt(i));
                }
                System.out.print(" ");
            }
            System.out.println(".");
        }
        else
        {
            System.out.println("Invalid Input");
        }
    }
}