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What is a recursion method in Java?

What is a recursion method in Java?

Technology

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A recursion method in Java is a technique in programming where a method calls itself in order to solve a problem. This is particularly useful for tasks that can be broken down into similar subtasks. Here’s a basic overview:

1. Base Case: This is a condition that stops the recursion. Without a base case, the method would call itself indefinitely, leading to a stack overflow error.
2. Recursive Case: This is where the method calls itself with a modified parameter, gradually moving towards the base case.

A classic example of recursion is the calculation of a factorial. The factorial of a number `n` (denoted as `n!`) is the product of all positive integers less than or equal to `n`. The factorial can be defined recursively as follows:

• Base case: The factorial of 0 is 1 (`0! = 1`).
• Recursive case: The factorial of any number `n` is `n` times the factorial of `n-1` (`n! = n * (n-1)!`).

Here’s how a factorial method might look in Java:

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`public class Factorial { public static int factorial(int n) { if (n == 0) { // Base case return 1; } else { // Recursive case return n * factorial(n - 1); } } public static void main(String[] args) { int result = factorial(5); System.out.println("Factorial of 5 is: " + result); } }`

In this example, `factorial` method calls itself with `n - 1` until `n` becomes 0, at which point it returns 1. The recursion then unwinds, calculating the factorial step by step.

In conclusion, recursion is a powerful concept! However, must become used with care. Moreover, as improper use (like forgetting the base case or creating too many recursive calls) leads to performance issues. In addition, stack overflow errors.

(w3schools.com)

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