Please help me with the tasks below using java 2 MAKE A RECURSIVE FACTORIAL METHODWrite a recursive factorial method (try not to look at the one we made in class).3 CHANGE THIS TO A RECURSIVE METHODWrite a recursive version of this looping program. (Hint: You need to replace the Whileloop with a recursive method.)public class Reverse {public static void main(String [largs) {String str= JOptionPane.showInput Dialog("Type a string to reverse: ");int index str.length() - 1;while (index >= 0) {print (str.substring (index, index + 1));index--;4 THE BUNNY EAR PROBLEMWe have bunnies standing in a line, numbered 1, 2, ... The odd bunnies (1, 3, ..) havethe normal 2 ears. The even bunnies (2, 4, ..) we'll say have 3 ears, because theyeach have a raised foot. Recursively return the number of "ears" in the bunny line1, 2, ... n (without loops or multiplication) for the number of bunnies entered by theuser.bunnyEars2(0) → 0bunnyEars2(1)→ 2bunnyEars2(2)→→5

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Answered: Write a recursive factorial method (

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Database System Concepts

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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

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Computational Systems

The computation systems can be defined as the systems that are capable of solving a problem that includes calculations either mathematical or logical, and are able to produce the result as an output. For example, a simple calculator that is given a set of numbers and operators as input and produces the result as an output can be defined as a computational system. The above example is a simple illustration only, the computational systems range from simple devices to complex devices such as the systems that control the SpaceX companies, Starlink satellites which are being quite recently seen in the skies at many places globally.

Question

Please help me with the tasks below using java

2 MAKE A RECURSIVE FACTORIAL METHOD
Write a recursive factorial method (try not to look at the one we made in class).
3 CHANGE THIS TO A RECURSIVE METHOD
Write a recursive version of this looping program. (Hint: You need to replace the While
loop with a recursive method.)
public class Reverse {
public static void main(String [largs) {
String str= JOptionPane.showInput Dialog("Type a string to reverse: ");
int index str.length() - 1;
while (index >= 0) {
print (str.substring (index, index + 1));
index--;
4 THE BUNNY EAR PROBLEM
We have bunnies standing in a line, numbered 1, 2, ... The odd bunnies (1, 3, ..) have
the normal 2 ears. The even bunnies (2, 4, ..) we'll say have 3 ears, because they
each have a raised foot. Recursively return the number of "ears" in the bunny line
1, 2, ... n (without loops or multiplication) for the number of bunnies entered by the
user.
bunnyEars2(0) → 0
bunnyEars2(1)→ 2
bunnyEars2(2)→→5

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