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Java String Exercises: Reverse a string using recursion

Java String: Exercise-44 with Solution

Write a Java program to reverse a string using recursion.

Pictorial Presentation:

Java String Exercises: Reverse a string using recursion

Sample Solution:

Java Code:

import java.util.*;
class Main {
 void reverseString(String str1) {
  if ((str1 == null) || (str1.length() <= 1))
   System.out.println(str1);
  else {
   System.out.print(str1.charAt(str1.length() - 1));
   reverseString(str1.substring(0, str1.length() - 1));
  }
 }
 public static void main(String[] args) {
  String str1 = "The quick brown fox jumps";
  System.out.println("The given string is: " + str1);
  System.out.println("The string in reverse order is:");
  Main obj = new Main();
  obj.reverseString(str1);
 }
}

Sample Output:

The given string is: The quick brown fox jumps
The string in reverse order is:
spmuj xof nworb kciuq ehT

Flowchart:

Flowchart: Java String  Exercises - Reverse a string using recursion

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Java Code Editor:

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Next: Write a Java program to reverse words in a given string.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH