Swayam Solver: NPTEL Programming In Java Programming Assignment July-2026 Week 8 to 12

Programming In Java - July 2026 - W8 to W12

NPTEL

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Creating a Thread using Thread Class

Problem Statement

In Java, you can run multiple tasks at the same time using Multithreading.
The simplest way to create a thread is by extending the built-in Thread class.

What is a Thread?

A thread is a small unit of a program that runs independently
Multiple threads can run in parallel, improving efficiency

Programming Assignment:

Create a class called MyThread that extends Thread
In its run() method, print "Thread is running"
In the main method, create an object of MyThread and start the thread

This helps you understand the basic way to create and start a thread in Java.

Complete Program

public class W08_P1 {
    // Create a class that extends Thread
    static class MyThread extends Thread {
        @Override
        public void run() {
            // --- START OF SOLUTION CODE ---
            System.out.print("Thread is running");
            // --- END OF SOLUTION CODE ---
        }
    }

    public static void main(String[] args) {
        // Create object of MyThread
        MyThread t = new MyThread();
        // Start the thread
        t.start();
    }
}

Code Snippet to Paste in the Editor

// --- START OF SOLUTION CODE ---
System.out.print("Thread is running");
// --- END OF SOLUTION CODE ---

You may submit any number of times before the due date. The final submission will be considered for grading.

This assignment has Public Test cases. Please click on "Compile & Run" button to see the status of Public test cases. Assignment will be evaluated only after submitting using Submit button below. If you only save as or compile and run the Program, your assignment will not be graded and you will not see your score after the deadline.

Evaluation Results

CompilationSuccessful|Public Test Cases: 2/2 Passed

Note: These tests may not be considered while scoring.

Know more.

Public Test Cases

Test Case

Input

Expected Output

Output

Status

Test Case 1

Thread is running

Thread is running

Test Case 2

Thread is running

Thread is running

Problem Statement

In Java, another common way to create threads is by implementing the Runnable interface.

What is Runnable?

Runnable is an interface with a single method called run()
You can pass a Runnable object to a Thread and start the thread

Why use Runnable?

It allows your class to extend another class, as Java supports single inheritance
It provides flexibility in thread creation

Programming Assignment:

Create a class called MyRunnable that implements Runnable
In its run() method, print "Runnable thread is running"
In the main method, create a Thread object using MyRunnable and start the thread

This demonstrates thread creation using the Runnable interface.

Complete Program

public class W08_P2 {
    static class MyRunnable implements Runnable {
        @Override
        public void run() {
            // --- START OF SOLUTION CODE ---
            System.out.print("Runnable thread is running");
            // --- END OF SOLUTION CODE ---
        }
    }

    public static void main(String[] args) {
        // Create object of MyRunnable
        MyRunnable r = new MyRunnable();
        // Create Thread using Runnable object
        Thread t = new Thread(r);
        // Start the thread
        t.start();
    }
}

Code Snippet to Paste in the Editor

// --- START OF SOLUTION CODE ---
System.out.print("Runnable thread is running");
// --- END OF SOLUTION CODE ---

You may submit any number of times before the due date. The final submission will be considered for grading.

Evaluation Results

CompilationSuccessful|Public Test Cases: 1/1 Passed

Note: These tests may not be considered while scoring.

Know more.

Public Test Cases

Test Case

Input

Expected Output

Output

Status

Test Case 1

Runnable thread is running

Runnable thread is running

Programming Assignment: Understanding Basic Thread States in Java

Problem Statement

When a thread runs in Java, it moves through different stages called states.

What are Thread States?
Think of a thread like a person:

It starts in one state
Moves to another as work happens
Finally, it finishes

For beginners, focus on these three simple states:

New – The thread is created but not started yet
Running – The thread is doing its work
Terminated – The thread has finished its work

Programming Assignment:

Create a class called MyThread that extends Thread
Inside its run() method, print "Thread is running"
In the main method:

Create a MyThread object
Print "Thread state before start"
Start the thread
Print "Thread state after start"
Wait for thread to finish using join()
Print "Thread state after completion"

This shows how thread state changes as the thread runs.

Complete Program

public class W08_P3 {
    // Create a class that extends Thread
    static class MyThread extends Thread {
        @Override
        public void run() {
            // --- START OF SOLUTION CODE ---
            System.out.println("Thread is running");
            // --- END OF SOLUTION CODE ---
        }
    }

    public static void main(String[] args) {
        // Create thread object
        MyThread t = new MyThread();
        // Thread is created but not started yet
        System.out.println("Thread state before start");
        // Start thread
        t.start();
        // Thread has started running
        System.out.println("Thread state after start");
        try {
            // Wait for thread to finish
            t.join();
        } catch (InterruptedException e) {
            // Not needed for beginners, but required to handle possible interruptions
        }
        // Thread has finished
        System.out.println("Thread state after completion");
    }
}

Code Snippet to Paste in the Editor

// --- START OF SOLUTION CODE ---
System.out.println("Thread is running");
// --- END OF SOLUTION CODE ---

You may submit any number of times before the due date. The final submission will be considered for grading.

Evaluation Results

CompilationSuccessful|Public Test Cases: 1/1 Passed

Note: These tests may not be considered while scoring.

Know more.

Public Test Cases

Test Case

Input

Expected Output

Output

Status

Test Case 1

Thread state before start\n
Thread state after start\n
Thread is running\n
Thread state after completion

Thread state before start\n
Thread state after start\n
Thread is running\n
Thread state after completion\n

Presentation Error

Understanding Thread Priority in Java

Problem Statement

In Java, each thread has a priority, a number from 1 (lowest) to 10 (highest).
Priority suggests how important a thread is, though actual scheduling depends on the system.

Programming Assignment:

Create a class MyThread that extends Thread
In the main method:

Create a MyThread object
Set its priority to 8
Start the thread
Print the thread's priority after setting

No output should come from the thread's run() method to avoid output mismatch.

Complete Program

public class W08_P4 {
    // Thread class
    static class MyThread extends Thread {
        @Override
        public void run() {
            // No output here to keep portal testing consistent
        }
    }
    public static void main(String[] args) {
        MyThread t = new MyThread();
        // Set thread priority
        t.setPriority(8);
        // Start thread
        t.start();

        // --- START OF SOLUTION CODE ---
        System.out.print("Thread priority is: " + t.getPriority());
        // --- END OF SOLUTION CODE ---
    }
}

Code Snippet to Paste in the Editor

// --- START OF SOLUTION CODE ---
System.out.print("Thread priority is: " + t.getPriority());
// --- END OF SOLUTION CODE ---

You may submit any number of times before the due date. The final submission will be considered for grading.

Evaluation Results

CompilationSuccessful|Public Test Cases: 1/1 Passed

Note: These tests may not be considered while scoring.

Know more.

Public Test Cases

Test Case

Input

Expected Output

Output

Status

Test Case 1

Thread priority is: 8

Thread priority is: 8

Programming Assignment: Introduction to Thread Synchronization

Problem Statement

What is a Thread?
Imagine your computer doing many tasks at once — for example:

Playing music
Downloading files
Browsing the internet

In Java, each small task that runs independently is called a Thread.
Threads help programs run faster by working at the same time.

Why Synchronization?
When multiple threads work on the same thing together, they may interfere with each other.
For example:

Two threads try to update the same number at the same time
The final result may be wrong

What is Synchronization?

It is like putting a lock
Only one thread can work on the shared thing at a time
This prevents problems caused by threads disturbing each other

Programming Assignment:

Create a class Counter with a number count starting from 0
Write a method increment() to increase the number by 1, using synchronized keyword
Create a thread class called MyThread that runs the increment() method 1000 times
In main, run two threads to increase the number
After both threads finish, print the final count

This shows how to use synchronization to avoid problems when multiple threads share data.

Complete Program

public class W08_P5 {
    // Shared class with a number
    static class Counter {
        int count = 0;
        // Synchronized method to safely increase number
        public synchronized void increment() {
            count++;
        }
    }
    // Thread class to run increment
    static class MyThread extends Thread {
        Counter c;
        MyThread(Counter c) {
            this.c = c;
        }
        @Override
        public void run() {
            // --- START OF SOLUTION CODE ---
            for (int i = 0; i < 1000; i++) {
                c.increment();
            }
            // --- END OF SOLUTION CODE ---
        }
    }
    public static void main(String[] args) {
        Counter c = new Counter();
        // Create two threads
        MyThread t1 = new MyThread(c);
        MyThread t2 = new MyThread(c);
        // Start both threads
        t1.start();
        t2.start();
        try {
            // Wait for both threads to finish
            t1.join();
            t2.join();
        } catch (InterruptedException e) {
        }
        // Print final count
        System.out.println("Final count is: " + c.count);
    }
}

Code Snippet to Paste in the Editor

// --- START OF SOLUTION CODE ---
for (int i = 0; i < 1000; i++) {
    c.increment();
}
// --- END OF SOLUTION CODE ---

You may submit any number of times before the due date. The final submission will be considered for grading.

Evaluation Results

CompilationSuccessful|Public Test Cases: 1/1 Passed

Note: These tests may not be considered while scoring.

Know more.

Public Test Cases

Test Case

Input

Expected Output

Output

Status

Test Case 1

Final count is: 2000

Final count is: 2000\n

Presentation Error

Swayam Solver

NPTEL Programming In Java Programming Assignment July-2026 Week 8 to 12 - Swayam

NPTEL

Complete Program

Code Snippet to Paste in the Editor

Evaluation Results

Public Test Cases

Complete Program

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Evaluation Results

Public Test Cases

Complete Program

Code Snippet to Paste in the Editor

Evaluation Results

Public Test Cases

Complete Program

Code Snippet to Paste in the Editor

Evaluation Results

Public Test Cases

Complete Program

Code Snippet to Paste in the Editor

Evaluation Results

Public Test Cases

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