Programming in Java | NPTEL 2022 | Week 4 Programming Assignments Solutions

This article will help you with the answers of Programming in Java NPTEL 2022 Week 4 Programming Assignment Solutions.

Programming in Java NPTEL Week 4 Programming Assignment 1 Solutions

Complete the code segment to execute the following program successfully. You should import the correct package(s) and/or class(s) to complete the code.

// Import the required package(s) and/or class(es)
import java.io.*;
import java.util.*;
import static java.lang.System.*;


// main class Question is created
public class Question41{
  public static void main(String[] args) {
	// Scanner object is created
    Scanner scanner = new Scanner(System.in);
     // Read String input using scanner class
    String courseName = scanner.nextLine(); 
     // Print the scanned String
    out.println("Course: " + courseName); 
  }
}

Programming Assignment 2 Solution

Complete the code segment to print the current year. Your code should compile successfully.

// The following is the declaration of the main class named Question42
public class Question42 { 
	public static void main(String args[]){
		int year; // integer type variable to store year


                // Create an object of Calendar class. 
                java.util.Calendar cal_obj;

		// Use getInstance() method to initialize the Calendar object.
                cal_obj = java.util.Calendar.getInstance();
	
		// Initialize the int variable year with the current year
                year = cal_obj.get(cal_obj.YEAR);


                // Print the current Year
		System.out.println("Current Year: "+year);

         }
}

Programming Assignment 3 Solution

The program in this assignment is attempted to print the following output: 
—————–OUTPUT——————-
This is large
This is medium
This is small
This is extra-large
————————————————-
However, the code is intentionally injected with some bugs. Debug the code to execute the program successfully.

interface ExtraLarge{
	String extra = "This is extra-large";
	public static void display();
}

class Large {
    public void Print() {
        System.out.println("This is large")
    }
}
 
class Medium extends Large {
    public void Print() {
    	  super.super.Print();  
        System.out.println("This is medium");
    }
}
class Small extends Medium {
    public void Print() {
        super.Print(); ; 
        System.out.println("This is small");
    }
  }
}
 
class Question43{
    public static void main(String[] args) {
        Small s = new Small();
        s.Print();
	  Question43 q = new Question43();
	  q.display();
    }
}

Correct Code:

interface ExtraLarge{
	String extra = "This is extra-large";
	void display();
}

class Large {
    public void Print() {
        System.out.println("This is large");
    }
}
 
class Medium extends Large {
    public void Print() {
    	  super.Print();  
        System.out.println("This is medium");
    }
}
class Small extends Medium {
    public void Print() {
        super.Print(); ; 
        System.out.println("This is small");
    }
  }

 
class Question43 implements ExtraLarge{
    public static void main(String[] args) {
        Small s = new Small();
        s.Print();
	  Question43 q = new Question43();
	  q.display();
      
    }
    public void display(){
        System.out.print(extra);
    }
}

Week 4: Programming Assignment 4 Solution

Complete the code segment to call the default method in the interface First and Second.

interface First{ 
    // default method 
    default void show(){ 
        System.out.println("Default method implementation of First interface."); 
    } 
} 
  
interface Second{ 
    // Default method 
    default void show(){ 
        System.out.println("Default method implementation of Second interface."); 
    } 
} 
  
// Implementation class code 
class Question44 implements First, Second{ 
    // Overriding default show method 
    public void show(){


// Call show() of First interface.
First.super.show();

// Call show() of Second interface.
Second.super.show();


 } 
  
    public static void main(String args[]){ 
        Question44 q = new Question44(); 
        q.show(); 
    } 
}

Week 4: Programming Assignment 5 Solution

Modify the code segment to print the following output.
—————–OUTPUT——————-
Circle: This is Shape1
Circle: This is Shape2
————————————————-

// Interface ShapeX is created
interface ShapeX {
 public String base = "This is Shape1";
 public void display1();
}

// Interface ShapeY is created which extends ShapeX
interface ShapeY extends ShapeX {
 public String base = "This is Shape2";
 public void display2();
}

// Class ShapeG is created which implements ShapeY
class ShapeG implements ShapeY {
 public String base = "This is Shape3";
 //Overriding method in ShapeX interface
 public void display1() {
  System.out.println("Circle: " + ShapeX.base);
 }
 // Override method in ShapeY interface
  public void display2(){
  System.out.print("Circle: " + ShapeY.base);
  }
}


// Main class Question 
public class Question45{
 public static void main(String[] args) {
  //Object of class shapeG is created and display methods are called.
  ShapeG circle = new ShapeG();
  circle.display1();
  circle.display2();
 }
}

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