Question

write a program in java that asks the user for a sentence, and then returns that string with the words backwards. For example: Enter a sentence! Mary had a little lamb. Your sentence backwards: lamb. little a had Mary Write a method called reverse() that accepts a sentence as a string, and then returns that string with the words backwards. Write a main() method that gets the string from the user and then displays the string backwards. demonstrate program by writing comments

Answer 1

Screenshot

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Program

/*
* This program is to reverse a sentence
* Here user input a sentence
* Then main method call reverse function to reverse the sentence
*/
//Package for key board read
import java.util.Scanner;

public class ReverseSentence {
   /*
   * Method to reverse the string
   * Here we split the string using space and store into an array
   * Then from last to first of the array values concatenate with initialized empty string with space
   * return the reversed string
   */
   public static String reverse(String str) {
       String arr[]=str.split(" ");
       str="";
       for(int i=arr.length-1;i>=0;i--) {
           str+=arr[i]+" ";
       }
       return str;
   }
//Test method
   public static void main(String[] args) {
       //Scanner object open for keyboard read
       Scanner sc=new Scanner(System.in);
       //Prompt for sentence
       System.out.print("Enter a sentence! ");
       //Read sentence
        String inputSentence=sc.nextLine();
        //Call method to display reversed sentence
        System.out.println(reverse(inputSentence));
        //Close the scanner object
        sc.close();
   }

}

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Output

Enter a sentence! Mary had a little lamb.
lamb. little a had Mary