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Master-Level Programming Assignments with Solutions

Below are two sample master-level programming questions along with their expert solutions.

Question 1: Advanced Java - Multithreading and Synchronization

Problem Statement: Write a Java program that demonstrates multithreading by simulating a bank account with multiple users trying to withdraw money simultaneously. Ensure thread safety using synchronization.

Solution:

class BankAccount {
    private int balance = 1000;

    public synchronized void withdraw(int amount, String user) {
        if (balance >= amount) {
            System.out.println(user + " is withdrawing " + amount);
            balance -= amount;
            System.out.println("Remaining balance: " + balance);
        } else {
            System.out.println("Insufficient funds for " + user);
        }
    }
}

class User extends Thread {
    private BankAccount account;
    private int amount;
    private String userName;

    public User(BankAccount account, int amount, String userName) {
        this.account = account;
        this.amount = amount;
        this.userName = userName;
    }

    public void run() {
        account.withdraw(amount, userName);
    }
}

public class BankSimulation {
    public static void main(String[] args) {
        BankAccount account = new BankAccount();
        User user1 = new User(account, 500, "Alice");
        User user2 = new User(account, 700, "Bob");
        user1.start();
        user2.start();
    }
}

This solution ensures that multiple threads (users) can access the bank account safely, preventing race conditions through synchronized methods.

Question 2: Python - Implementing a Simple Web Scraper

Problem Statement: Write a Python program that scrapes the latest news headlines from a website using the requests and BeautifulSoup libraries.

Solution:

import requests
from bs4 import BeautifulSoup

def get_latest_headlines(url):
    response = requests.get(url)
    if response.status_code == 200:
        soup = BeautifulSoup(response.text, 'html.parser')
        headlines = soup.find_all('h2', class_='news-headline')
        return [headline.text for headline in headlines]
    else:
        return "Error fetching the webpage."

news_url = "https://example-news-site.com"
latest_headlines = get_latest_headlines(news_url)
print("Latest News Headlines:")
for idx, headline in enumerate(latest_headlines, start=1):
    print(f"{idx}. {headline}")

This solution demonstrates how to fetch and parse HTML content from a webpage using BeautifulSoup, an essential skill for data extraction projects.

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