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NPTEL Programming In Java Week 3 Assignment Answers
Q1. Which of the following statement(s) is/are correct about the constructor?
Answer: a. Constructors cannot be synchronized in Java.
b. Java does not provide a default copy constructor.
d. “this” or “super” can be used in a constructor.
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Q2. Which of the following statement(s) is/are true?
Answer: a. You can write a new instance method in the subclass with the same signature as the one in the superclass, thus overriding it.
b. You can write a new static method in the subclass with the same signature as the one in the superclass, thus hiding it.
c. A subclass inherits all of its parent’s public and protected members, no matter what package the subclass is in.
Q3. Consider the following piece of code.
class Test {
void exam () {}
}
public class Test1 extends Test {
________void exam () {} // insert correct keyword
public static void main(String[] args) {
System.out.println(" Correct");
}
}Fill in the blank with the appropriate keyword(s) from the list given below so that the program compiles successfully.
Answer: b. final
d. public
Q4. How many instances of abstract class can be created?
Answer: a. 0
Q5. Structuring a Java class such that only methods within the class can access its instance variables is referred to as _______.
Answer: d. encapsulation
Q6. Which of the following statement(s) is/are true?
Answer: a. A final method cannot be overridden in a subclass.
b. The advantage of private static methods is that they can be reused later if you need to reinitialize the class variable.
c. Class methods cannot use this keyword as there is no instance for this to refer to.
Q7. Consider the following piece of code.
public class Question{
Question () {
this ();
}
public static void main(String[] args) {
Question obj = new Question ();
System.out.println("Java");
}
}Which of the following is the output of the above program?
Answer: b. There will be a compile-time error.
Q8. Consider the following program.
public class Question
{
public static void main(String[] args) {
String str = "Programming in java.";
System.out.println(str.charAt (4) +str.substring (8, 11));
}
}What is the output of the above program?
Answer: b. ring
Q9. Which of the following statement(s) is/are False?
Answer: c. The term “class variable” is another name for a non-static field.
Q10. Which of the following statement(s) is/are true?
Answer: a. Static methods in interfaces are never inherited.
b. You will get a compile-time error if you attempt to change an instance method in the superclass to a static method in the subclass.
c. You can prevent a class from being subclassed by using the final keyword in the class’s declaration.
d. An abstract class can only be subclassed; it cannot be instantiated.
Programming In Java Week 3 Programming Assignment Answers
Q1.
class Point{
double x;
double y;
public static void distance(Point p1,Point p2){
double dis;
dis=Math.sqrt((p2.x-p1.x)*(p2.x-p1.x) + (p2.y-p1.y)*(p2.y-p1.y));
System.out.println(dis);
}
}
Q2.
QuestionScope stp = new QuestionScope();
int result1=stp.sum(n1,n2);
int result2=QuestionScope.multiply(n1,n2);
System.out.println(result1);
System.out.print(result2);Q3.
public static void swap(Question t) {
int tempo = t.e1;
t.e1 = t.e2;
t.e2 = tempo;
}
Q4.
if (n==1)
return (0);
else if(n==2)
return 1;
return (fib(n - 1) + fib(n - 2));
Q5.
double height1;
Test1(double l,double h)
{
super(l);
this.length = l;
this.height1 = h;
}
Test1(double l,double b,double h)
{
super(l,b);
this.length=l;
this.breadth=b;
this.height1=h;
}
double calculate()
{
return length*breadth*height1;
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