Permutation of Array in Java | nPr & nPn | Easy Backtracking Method

In this video, we explain how to generate all permutations of an array in Java using an efficient backtracking and swap-based approach. This video covers: ✔ Permutation logic in Java ✔ Difference between nPn and nPk ✔ How to print permutations without extra space ✔ Step-by-step recursion and backtracking explanation ✔ Generic permutation function using Java Generics Example explained: 5P3 = 60 permutations 5P5 = 120 permutations This permutation logic is commonly asked in: • Java interviews • Data Structures & Algorithms (DSA) • Competitive programming • Coding tests (FAANG, product-based companies) Source code included and explained clearly. 👍 Like, Share & Subscribe for more Java & DSA tutorials. #java #permutation #backtracking #recursion #dsa #codinginterview #javaprogramming