Answered Essay: Write a Java program that takes all the lines input to standard input and writes them to standard

Write a Java program that takes all the lines input to standard input and writes them to standard output in reverse order. That is, each line is output in the correct order, but the ordering of the lines is reversed.

Expert Answer



  • Code in Java is provided below.
  • Read all the comments for better understanding of the code.
  • Each and every step is explained well in code itself.
  • Note class name is ReverseOrder.
  • Output is provided in form of screenshots.

Code in JAVA::

import java.util.Scanner;

public class ReverseOrder{

public static void main(String[] args){


* To enter input from keyboard into standard input

* Scanner class is used.


Scanner stdin=new Scanner(;


* An array of strings is declared below named

* lines[] of size 2000(You can change as per the requirement).


String lines[]=new String[2000];


* Integer index is used to keep count of number of lines

* entered by user.


int index=0;


* Now we scan lines and store them into

* array lines[].

* This while loop will terminate when user enters empty string

* i.e when s=””.


System.out.println(“________Enter Lines_______”);

String s;



* If user enter some string then that string

* is first stored in String variable named s.



* Now s is stored in array lines at current index

* Notice that after storing s at line[index],

* index is incremented.






* Now to print lines in reverse order using

* standard output we run a for loop to traverse through

* Array lines[].

* We traverse in reverse order starting with index-1.


System.out.println(“_________Reverse order lines_________”);

for(int i=index-1;i>=0;i–){



}//main ends here

}//class ends here


Test case 1::

Test case 2:: (Here at start empty string is entered so no values are there in array lines to show)

Test Case 3::

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