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Sample Master-Level Java Assignment Questions & Solutions

Question 1:
Design a multithreaded Java program that simulates a banking system where multiple users can deposit and withdraw money concurrently without causing inconsistency.

Solution:
To solve this, we use synchronization to ensure thread safety.

class BankAccount {
    private double balance = 1000;

    public synchronized void deposit(double amount) {
        balance += amount;
        System.out.println("Deposited: " + amount + ", Balance: " + balance);
    }

    public synchronized void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
            System.out.println("Withdrawn: " + amount + ", Balance: " + balance);
        } else {
            System.out.println("Insufficient balance");
        }
    }
}

class UserThread extends Thread {
    BankAccount account;

    UserThread(BankAccount account) {
        this.account = account;
    }

    public void run() {
        account.deposit(500);
        account.withdraw(300);
    }
}

public class BankingSystem {
    public static void main(String[] args) {
        BankAccount account = new BankAccount();
        new UserThread(account).start();
        new UserThread(account).start();
    }
}

Question 2:
Implement a Java program using generics to create a reusable method that finds the maximum element in a list.

Solution:

import java.util.*;

public class GenericMax {
    public static <T extends Comparable<T>> T findMax(List<T> list) {
        T max = list.get(0);
        for (T element : list) {
            if (element.compareTo(max) > 0) {
                max = element;
            }
        }
        return max;
    }

    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(3, 7, 2, 9, 5);
        System.out.println("Max: " + findMax(numbers));
    }
}

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