Java

Recursion in Java-DSA Recursion is a programming technique where a function calls itself repeatedly until a certain condition is met. In Java, recursion is commonly used in Data Structures and Algorithms (DSA) to solve problems involving trees, graphs, and other recursive structures. Here is an example of a recursive function to calculate the factorial of a number: Here is an example of a recursive function to calculate the factorial of a number: java Copy code public static int factorial ( int n)  { if (n == 0 ) {  return 1 ;   }  else {  return n * factorial(n- 1 );  }  } This function takes an integer n as input and returns the factorial of n. The factorial of a number is the product of all integers from 1 to that number. For example, the factorial of 4 is 4 * 3 * 2 * 1 = 24. The function first checks if n is equal to 0. If it is, it returns 1 (the base case). If n is not equal to 0, it calls itself with n-1 as the input and m...