What is the control flow of below program?

Question

Public class A {
Static string rev Recursively (string str) {
return str. length() <2?str:revRecursively(str.substring(1))+str.chatAt(0);}
public static void main (String [] args) {
String string="edone" ;
System.out.print(revRecursively(string)) ;}}

Output : node

Answer 1

Process illustrated...

!!!I ll take the method name as r for ez reference

r("edon") will return r("don") + "e"
>>> and the r method will continuously append the first character to the end.

So if I wrapped the return value in each call it will look something like this

((("n")+"o")+"d") + "e"

As you can see n is the last character returned and then the recursive call will be stopped.

After pasting those chars u will get "node"

Please refer to the link i provided above as it is too hard to demonstrate this kind of recursion

Answer 2

This is a challenge question right? Well this is a method to reverse a string recursively.

https://www.javatpoint.com/recursion-in-java

Each time the method get called it will return the last char and it will call the method itself - understanding the recursion is very important to what I m going to say. This process will happen until the length of value passed to the method is less than 2 - 0, 1.

And ultimately, you will get a reversed string