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Java program to reverse the string.

                Let us see the java program to reverse the string. 

Content.
  1. What is Reverse the String.
  2. Logic for program.
  3. Program.
  4. Explanation.
  5. Output.


What is Reverse the string?
             Revering string means the order of the string changes, it displays the string from backward.
Example:
                    our Input: name
                       Output: eman


Logic for the Program.
  • We need to display the last string first.
  • So, when we use that in a loop, to get the Reversed string.


Program

import java.io.*;
class exrev
{
  public static void main(String args[]) throws IOException
   {
     String A, B="";
     int x,y;
     char c;
     InputStreamReader read=new InputStreamReader(System.in);
     BufferedReader in = new BufferedReader(read);
     System.out.println("Enter the string");
     A=in.readLine();
     x=A.length();
       for(y=0;y<x;y++)
        {
          c=(A.charAt(y));
          B=c+B;
        }
  System.out.println("Given string=" +A);
 System.out.println("Reveresed string=" +B);
   }
}

Explanation.
  • We have given the class name has exrev.
  • public static void main(String arg[]) refers to add a method i.e array of strong method to the program.
  • String A,B, int x,y, char c is declaring the variable, s is declared to store 0. 
  • InputStreamReader read = new InputStreamReader(System.in); we create this object because we need to give the value to variable at the time of execution, this is a one of the way to give value to a variable.
  • BufferedReader in = new BufferedReader(read); we create this object because, we need a buffer to store the value of the variable.
  • Now, we have to give condition which satisfies all the above int the logic for the program. I choose,  for loop with y=0,y<x,y++ as condition.
  • A is the string we give, B is reversed string.
  • System.out.println is used to display the given in output screen(make sure S in System is capital)


Know more about for loop here.


Output:

       Compile : javac exrev.java
       Run        : java exrev
       Enter the string
       computer science
       Given string: computer science
       Reversed string: ecneics retupmoc

       Compile : javac exrev.java
       Run        : java exrev
       Enter the string
       computer science
       Given string: java
       Reversed string: avaj



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