Fahim khan

Remember those awesome Lego castles you built as a kid?  Java uses a similar idea called Object-Oriented Programming (OOP) to create complex programs. Imagine tiny building blocks: Classes : These are like the instruction manuals for your Legos. They define what a certain piece looks like (properties) and what it can do (methods). Objects : These are the actual Lego pieces you build. Each object is built based on a specific class, inheriting its properties and methods. Think of it this way: You have a class called "Car." This class defines what a car has (wheels, engine, color) and what it can do (start, stop, turn). Now, you can create multiple objects (cars) based on this "Car" class. Each car (object) will have its own color, size, and the ability to start, stop, and turn. Benefits of OOP: Organization : OOP helps break down complex programs into smaller, manageable pieces (classes and objects). Reusability : Just like you can use the same Lego pieces in dif...

Have you ever wondered how the cool apps you use are built? Well, Java is a powerful programming language behind many of them! Today, we'll embark on a beginner-friendly adventure to understand its basics. Learning the ABCs:  The Fundamentals of Java Imagine Java as a set of instructions a computer can understand. Just like you follow steps to build a Lego set, Java code gives clear instructions to create programs. We'll start by learning these essential building blocks: Variables : These are like tiny boxes that hold information you use in your code, like numbers or text. Operators : Think of them as tools. You can use them to add, subtract, compare, and perform other calculations on the information stored in your variables. Control Flow : This is like the traffic lights in your code. It decides what happens next based on certain conditions. Object-Oriented Playground:  Building with Classes and Objects Imagine a blueprint for a car. This blueprint defines the car's parts...

In the world of Android development, speeding up image loading can make your app shine. You might wonder how apps like Instagram and Pinterest load images so fast. Well, they have some help from behind the scenes, and we're about to spill the beans. Let's dive into the secret sauce of Android image-loading libraries like Glide and Fresco: 🌟 Making UI Snappier with Bitmap Pool Ever noticed your app becoming sluggish? It's usually because of two main culprits: Garbage Collector (GC): It's like a cleanup crew that runs too often, slowing things down. Main Thread Overload: When your app's doing too much work on the main thread, it can't keep up. So, how do these image loading libraries help? They use something called the Bitmap Pool. It's like recycling for bitmaps. When you have lots of images, the app constantly tosses them in and out of memory, making the GC work overtime. The libraries solve this by reusing bitmaps. Instead of creating new bitmaps, they che...

class GFG { private final int V ; private final List<List<Integer>> adj ; public GFG ( int V) { this . V = V ; adj = new ArrayList<>(V) ; for ( int i = 0 ; i < V ; i++) adj .add( new LinkedList<>()) ; } // This function is a variation of DFSUtil() in // https://www.geeksforgeeks.org/archives/18212 private boolean isCyclicUtil ( int i , boolean [] visited , boolean [] recStack) { // Mark the current node as visited and // part of recursion stack if (recStack[i]) return true; if (visited[i]) return false; visited[i] = true; recStack[i] = true; List<Integer> children = adj .get(i) ; for (Integer c: children) if (isCyclicUtil(c , visited , recStack)) return true; recStack[i] = false; return false; } private void addE...

  Input format: Total Members in UI friend Network = N MemberId1 = N1 MemberId2 = N2 MemberId3 = N3 MemberIdN = Nn Output format: shortest time A takes to reach B Sample Input: 4 2 5 7 9 4 2 9 2 7 2 3 7 9 7 9 5 1 7 9 Sample Output: 5 Solution:3 public class Graph { static class Node { private String name ; private List<Node> shortestPath = new LinkedList<>() ; private Integer distance = Integer. MAX_VALUE ; Map<Node , Integer> adjacentNodes = new HashMap<>() ; public void addDestination (Node destination , int distance) { adjacentNodes .put(destination , distance) ; } public Node (String name) { this . name = name ; } // getters and setters public String getName () { return name ; } public void setName (String name) { this . name = name ; } public List<Node> getShortestPath () { ...

Git Challenge VII   This challenge asks you to create a branch, make some modifications on that branch, and force Git to not perform a fast-forward merge. The high-level steps for this task are: 1. Ensure you’re on the `main` branch. 2. Create a branch named `contact-details`. 3. Switch to that branch. 4. Edit the README.md file and add the following text to the end of the file: "Contact: support@razeware.com". 5. Save your edits to the file. 6. Stage your changes. 7. Commit your changes with an appropriate commit message, such as "Adding README contact information". 8. Switch back to the `main` branch. 9. Pull up the graph of the repository, and don’t forget to use the `--all` option to see history of all branches. Make note of how `main` and `contact-details` look on this graph. 10. Merge in the changes from `contact-details`, using the `--no-ff` option. 11. Enter something appropriate in the merge message in Vim when prompted. Use the cheatsheet above to help yo...