NPTEL PROGRAMMING IN JAVA WEEK 4 ANSWERS (JUL-DEC 2020)

 

QUESTION 1:

import java.io.*;
import java.util.*;
import static java.lang.System.*;

QUESTION 2:

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

// Use getInstance() method to initialize the Calendar object.
current = java.util.Calendar.getInstance();

// Initialize the int variable year with the current year
year = current.get(current.YEAR);

QUESTION 3:

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.println(extra);
  }
}

QUESTION 4:

// Call show() of First interface.

First.super.show();

// Call show() of Second interface.

Second.super.show();

QUESTION 5:

// 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.println("Circle: " + ShapeY.base);}

}