(this is question1) public abstract class Shape { public Shape() { } public abstract double area() ; public String who() { return "Shape" ; } } public class Circle extends Shape { private int radius ; public Circle( int r ) { radius = r ; } @Override public double area() { return Math.PI * radius * radius ; } } public class Square extends Shape { private int _sideLength ; public Square( int sideLength ) { /* TODO question 45 */ } @Override public double area() { return _sideLength * _sideLength ; } } What is the output of the following code (approximate answer ok if needed)? Assume your constructor from question 1 above has been implemented and the following code is contained within a driver class. public static void main(String[] args) { report(new Circle(4)); report(new Square(5)); } public static void report( Shape s ) { System.out.println(s.who()); System.out.println(s.area()); }
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
(this is question1)
public abstract class Shape {
public Shape() { }
public abstract double area() ;
public String who() { return "Shape" ; }
}
public class Circle extends Shape {
private int radius ;
public Circle( int r )
{
radius = r ;
}
@Override
public double area()
{
return Math.PI * radius * radius ;
}
}
public class Square extends Shape {
private int _sideLength ;
public Square( int sideLength )
{
/* TODO question 45 */
}
@Override
public double area()
{
return _sideLength * _sideLength ;
}
}
What is the output of the following code (approximate answer ok if needed)? Assume your constructor from question 1 above has been implemented and the following code is contained within a driver class.
public static void main(String[] args) {
report(new Circle(4));
report(new Square(5));
}
public static void report( Shape s ) {
System.out.println(s.who());
System.out.println(s.area());
}
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