Programming In Java Week 4: Programming Assignments Jan-Jun 2022

  NPTEL PROGRAMMING ASSIGNMENTS

Programming In Java

Week 4 : Programming Assignment 1

Due Date of Submission 2022-02-24, 23:59 IST

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.

--Solution-- 

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

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); 

  }

}

Week 4 : Programming Assignment 2

Due Date of Submission 2022-02-24, 23:59 IST

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

Note: In this program, you are not allowed to use any import statement. Use should use predefined class Calendar defined in java.util package.

public class Question42 { 

public static void main(String args[]){

int year;

--Solution-- 

  java.util.Calendar curr; curr=java.util.Calendar.getInstance(); year=curr.get(java.util.Calendar.YEAR);

Week 4 : Programming Assignment 3

Due Date of Submission 2022-02-24, 23:59 IST

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.

--Solution-- 

  interface ExtraLarge{ String extra = "This is extra-large"; public 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 void display(){ System.out.print(extra); } public static void main(String[] args) { Small s = new Small(); s.Print(); Question43 q = new Question43(); q.display(); } }

Week 4 : Programming Assignment 4

Due Date of Submission 2022-02-24, 23:59 IST

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(){

--Solution-- 

  // 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

Due Date of Submission 2022-02-24, 23:59 IST

Modify the code segment to print the following output.

-----------------OUTPUT-------------------

Circle: This is Shape1

Circle: This is Shape2

-------------------------------------------------

--Solution-- 

  // Interface ShapeX is created interface ShapeX { public String baseX = "This is Shape1"; public void display1(); } // Interface ShapeY is created which extends ShapeX interface ShapeY extends ShapeX { public String baseY = "This is Shape2"; public void display2(); } // Class ShapeG is created which implements ShapeY class ShapeG implements ShapeY { public String baseG = "This is Shape3"; //Overriding method in ShapeX interface public void display1() { System.out.println("Circle: " + baseX); } public void display2() { // Override method in ShapeY interface System.out.print("Circle: " + baseY); } }

// 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();

 }
}