2. What is printed by the following application? // Circle.java: Contains both Circle class and its user class 1. public class Circle { 2. public double x, y; // center of the circle 3. public double r; // radius of circle //Methods to return circumference and area 4. public int circumference() { 5. return 2*3.14*r; } 6. public double area() { 7. return 3.14 * r * r; } } // User class MyMain 8. class MyMain { 9. public static void main(String args[]) { 10. Circle aCircle; // creating reference 11. aCircle = new Circle(); // creating object 12. aCircle.x = 10; // assigning value to data field 13. aCircle.y = 20; 14. aCircle.r = 5; 15. double area = aCircle.area(); 16. double circumf = aCircle.circumference(); 17. System.out.println("Radius="+aCircle.r+" Area="+area); 18. System.out.println("Circumference ="+circumf); } } 3. What are the names of Class identifiers in two classes? 4. What are identifiers x and y called on line 2?
2. What is printed by the following application?
// Circle.java: Contains both Circle class and its user class
1. public class Circle
{
2. public double x, y; // center of the circle
3. public double r; // radius of circle
//Methods to return circumference and area
4. public int circumference()
{
5. return 2*3.14*r;
}
6. public double area()
{
7. return 3.14 * r * r;
}
}
// User class MyMain
8. class MyMain {
9. public static void main(String args[])
{
10. Circle aCircle; // creating reference
11. aCircle = new Circle(); // creating object
12. aCircle.x = 10; // assigning value to data field
13. aCircle.y = 20;
14. aCircle.r = 5;
15. double area = aCircle.area();
16. double circumf = aCircle.circumference();
17. System.out.println("Radius="+aCircle.r+" Area="+area);
18. System.out.println("Circumference ="+circumf);
}
}
3. What are the names of Class identifiers in two classes?
4. What are identifiers x and y called on line 2?
5. What is return type on line 4 in method header of circumference(), is it the correct type?
6. What is name of object for class Circle, give line number where it is initiated?
7. Add another identifier in the class to save the color for the circle and also add a method to
return the color of any object.
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