Question

Java

Write a valid Java method called printReverse that takes a String as a parameter and prints out the reverse of the String. Your method should not return anything. Make sure you use the appropriate return type.

Answer 1

A valid Java method called printReverse that takes a String as a parameter and prints out the reverse of the String.

public class Reverse extends Program {
      public void run()

        String str = readLine("Type a string to reverse: ");
        int index = str.length() - 1;
          while(index >= 0) {
              print(str.substring(index, index + 1));
              index--;
          }
      }
  }

need to introduce a new method, which we'll call printReverse.

public class ReverseRecur extends Program {
    public void run() {
        String line = readLine("Type a string to reverse: ");
        printReverse(line);
    }

    public void printReverse(String str) {
    }
}

recursive version of Reverse.

public class ReverseRecur extends Program {
      public void run() {
          String line = readLine("Type a string to reverse: ");
          printReverse(line);
       }
  
       public void printReverse(String str) {
          if(!str.equals("")) {
               print(str.substring(str.length() - 1));
             printReverse(str.substring(0, str.length() - 1));
          }
       }
   }

One more example:

import java.util.Scanner;

class ReverseString

{

public static void main(String args[])

{

String original, reverse = "";

Scanner in = new Scanner(System.in);

System.out.println("Enter a string to reverse");

original = in.nextLine();

int length = original.length();

for ( int i = length - 1 ; i >= 0 ; i-- )

     reverse = reverse + original.charAt(i);

System.out.println("Reverse of entered string is: "+reverse);

}

}