NPTEL Programming in Java Assignment 4 Answers 2023

NPTEL Programming in Java Assignment 4 Answers (Week 4)

Q1. Which of the following is the correct statement for creating a package?

a. <package name> package:
b. package <package name>;
c. package:
d. <package name>;

Answer: Option B

Q2. Which of the following source files cannot be included in a package?

Answer: D. data

Q3. Which of the following is/are used to access a public package?

Answer: a. Refer to the member by its fully qualified name
b. Import the package member
c. Import the member’s entire package

Q4. Which of the following statement(s) is/are false?

Answer: b. System.out.println() is a predefined java function.

Q5. Consider the program given below.

public class Main{
public static void main(String args[]) {
System.out.println (cos (2*PI));
	}
}

What will be the output if the above program is executed?

Answer: a. It will give compile-time error

Q6. Which of the following is the minimum requirement for executing a Java program?

Answer: b. JRE
d. JRE without JDK

Q7. Which of the following is required for developing a Java program?

Answer: a. JDK

Q8. Which of the following statement(s) is/are correct?

Answer: b. Java byte code is generated by the compiler.
d. Java byte code is machine independent.

Q9. Which of the following is an advantage of methods?

Answer: a. Code re-usability

Q10. Consider the following programs:

public class Mainl{
public static void main(String args[]) {
int number = 10;
System.out.println (number+++++number);
	}
}

public class Main2{
public static void main(String args[]) {
int number = 10;
System.out.println(++number+number++);
	}
}

Choose correct statement about the output of this code segment.

Answer: C. Both Mainl and Main2 classes give the same output.

Java Programming Assignment 4 Answers

Q1.

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

Q2.

 java.util.Calendar current;

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

Q3.

 class Large 
{
    public void Print() 
    {
        System.out.println("This is small");
    }
}

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 large");
    }
}

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

Q4.

   
Second.super.show();

First.super.show();

Q5.

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

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

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

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