Nptel Programming in Java Week 6 Assignment Answers

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Programming In Java

Nptel Programming in Java Week 6 Assignment Answers

Que. 1 Consider the following code snippet.

class MyThread extends Thread {  
    public void run() {  
        for (int i = 0; i < 3; i++) {  
            System.out.println("Running thread: " + i);  
        }  
    }  
}  

public class Main {  
    public static void main(String[] args) {  
        MyThread thread = new MyThread();  
        thread.run();  
        System.out.println("Main method complete.");  
    }  
}

What will be the output of the program?

a) Running thread: 0
Running thread: 1
Running thread: 2
Main method complete.

b) Running thread: 0
Main method complete.
Running thread: 1
Running thread: 2

c) Main method complete.

d) Error: The thread was not started using start().

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Que. 2 Which of the following best describes the concept of multithreading in Java?

a) Multiple threads execute concurrently, sharing the same memory space.
b) Only one thread executes at a time, ensuring sequential execution.
c) Threads in Java cannot communicate with each other.
d) Threads require separate memory allocation for each thread to run.

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Que. 3 What will happen when the following code is executed?

class ExampleThread extends Thread {  
    public void run() {  
        System.out.println("Thread is running.");  
    }  
}  

public class Main {  
    public static void main(String[] args) {  
        ExampleThread thread = new ExampleThread();  
        thread.start();  
        thread.start();  
    }  
}

a) The program will execute successfully, printing "Thread is running." twice.
b) The program will throw an error when attempting to start the thread a second time.
c) The program will terminate without any output.
d) The thread will run only once, and the second start() call will be ignored.

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Que. 4 Find the error in the following program:

class RunnableExample implements Runnable {  
    public void run() {  
        for (int i = 1; i <= 3; i++) {  
            System.out.println("Runnable thread: " + i);  
        }  
    }  
}  

public class Main {  
    public static void main(String[] args) {  
        RunnableExample runnable = new RunnableExample();  
        runnable.run();  
        System.out.println("Main method ends.");  
    }  
}

a) The program will throw an error because Runnable cannot be executed directly.
b) The program will run successfully but will not create a new thread.
c) The program will create a new thread and execute concurrently.
d) The program will throw a runtime error because Thread is not used.

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Que. 5 What will happen when the following code is executed?

class RunnableExample implements Runnable {  
    public void run() {  
        for (int i = 1; i <= 3; i++) {  
            System.out.println("Thread running: " + i);  
        }  
    }  
}  

public class Main {  
    public static void main(String[] args) {  
        RunnableExample task = new RunnableExample();  
        Thread thread = new Thread(task);  
        thread.start();  
    }  
}

a) The program will throw a compile-time error because Runnable is not a thread.
b) The program will execute successfully, and the run() method will run in a new thread.
c) The program will execute the run() method directly on the main thread.
d) The program will throw a runtime error because Runnable is not properly implemented.

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Que. 6 Which of the following states can a thread enter during its lifecycle in Java?

a) New, Runnable, Running, Blocked
b) New, Runnable, Waiting, Blocked, Terminated
c) New, Runnable, Running, Sleeping, Dead
d) New, Active, Waiting, Suspended, Terminated

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Que. 7 What does the thread scheduler use to decide which thread to run when multiple threads are in the runnable state?

a) Thread priority
b) Thread’s execution time
c) Thread name
d) Thread creation order

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Que. 8 Consider the following program:

class PriorityExample extends Thread {  
    public void run() {  
        System.out.println(Thread.currentThread().getName() +  
            " with priority " +  
            Thread.currentThread().getPriority());  
    }  
}  

public class Main {  
    public static void main(String[] args) {  
        PriorityExample t1 = new PriorityExample();  
        PriorityExample t2 = new PriorityExample();  
        t1.setPriority(Thread.MIN_PRIORITY);  
        t2.setPriority(Thread.MAX_PRIORITY);  
        t1.start();  
        t2.start();  
    }  
}

Which of the following is true about the output?

a) The thread with the higher priority is guaranteed to execute first.
b) The thread with the lower priority will never execute.
c) The order of execution depends on the JVM and OS scheduling policies.
d) The program will throw an error due to invalid priority values.

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Que. 9 What is the primary purpose of thread synchronization in Java?

a) To allow multiple threads to execute a method at the same time
b) To ensure thread execution follows a specific order
c) To prevent race conditions and ensure data consistency
d) To allow threads to communicate with each other

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Que. 10 What is the primary difference between Byte Streams and Character Streams in Java?

a) Byte Streams handle characters, while Character Streams handle bytes.
b) Byte Streams are used for binary data, while Character Streams are used for text data.
c) Character Streams are faster than Byte Streams in all cases.
d) Character Streams cannot handle international characters like Unicode.

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Nptel Programming in Java Week 7 Assignment Answers – Click Here