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Java Recursion Method

Updated on April 11, 2015

This is one of my favorite part of java programming. It is little bit complex with its function. And obviously, it will turn to be a fun part, if you get it. It is called Java Recursion.So what is Java Recursion?Recursion is a programming technique where a method calls itself to find result.
You need to follow these things to work with Recursion successfully,

  • You need to figure out a stopping point which can be resolve without calling recursive function.
  • With calling every recursive method, you must reduce or approach to the stopping point otherwise you will get java.lang.StackOverFlowError(Learn more about StackOverFlowError)

Let’s consider the following recursive code:
1. public int myRecursive(){

2. int jVariable = myRecursive();

3. }


Attention!!! This code will never stop. (Needs stopping point) Anything special in this code? Yes, the name of the method: myRecursive. This is just a random name that I chose to use for this method. Actually, nothing special going on there. But, take a look at what we’re doing inside the method: we’re calling a method named myRecursive. Notice anything special there? Yes, that’s the same method name!So “Recursion!” happens.
Recursion!!! This method will call itself, and it will execute the code inside, which is to call itself, so it will execute the code inside of that method, which is to call itself, so it will execute that code, which is to call itself…You notice what I’m trying to say?
This code is missing a stopping point, this is the reason why it will run forever. Let’s include a stopping point.


1. public int myRecursive (int jVariable){

2. System.out.println(jVariable);

3. jVariable--;

4. if (jVariable == 0) //Stopping Point

5. return 0;

6. return myRecursive(jVariable);

7. }


Do you notice the LINE 4? When our int jVariable variable holds the value 0, then this method will not call itself again. It will simply exit out of the flow. This can be seen from the return 0 statement.So now, we have a method that calls itself with a decrementing value of jVariable. So once jVariable hits zero, our recursive method is finished!
Try to find output, if we call the method: myRecursive(5)
Think about it, try and follow through the code line by line. Once you have made a guess, then create a class and putmyRecursive method (static) inside your main method. For behind the scene, throw a breakpoint and debug.

public int myRecursive(){
int jVariable = myRecursive();
}
public int myRecursive (int jVariable){
System.out.println(jVariable);
jVariable--;
if (jVariable == 0) //Stopping Point
return 0;
return myRecursive(jVariable);
}

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