Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / kavitha deepak
James Gosling
| Is This Answer Correct ? | 5 Yes | 0 No |
Post New Answer View All Answers
What lambda means?
Can you explain the meaning of aggregation and composition
Write a java program to check if a number is prime or not?
When throw keyword is used?
What is arrays fill in java?
How is hashcode calculated in java?
What are kinds of processors?
What is files manifesting?
What is the difference between hashmap and hashtable in java?
What is the difference between the paint() and repaint() methods?
Explain covariant method overriding in java.
How many bits are used to represent unicode, ascii, utf-16, and utf-8 characters in java programming?
Give a practical example of singleton class usage?
What is the difference between a method and a function in alice?
3.2 Consider the following class: public class Point { protected int x, y; public Point(int xx, int yy) { x = xx; y = yy; } public Point() { this(0, 0); } public int getx() { return x; } public int gety() { return y; } public String toString() { return "("+x+", "+y+")"; } } Say you wanted to define a rectangle class that stored its top left corner and its height and width as fields. 3.2.1 Why would it be wrong to make Rectangle inherit from Point (where in fact it would inherit the x and y coordinates for its top left corner and you could just add the height and width as additional fields)? (1) 8 Now consider the following skeleton of the Rectangle class: public class Rectangle { private Point topLeft; private int height, width; public Rectangle(Point tl, int h, int w) { topLeft = tl; height = h; width = w; } public Rectangle() { this(new Point(), 0, 0); } // methods come here } 3.2.2 Explain the no-argument constructor of the Rectangle class given above. 3.2.3 Write methods for the Rectangle class to do the following: • a toString() method that returns a string of the format "top left = (x, y); height = h; width = w " where x, y, h and w are the appropriate integer values. • an above() method that tests whether one rectangle is completely above another (i.e. all y values of the one rectangle are greater than all y values of the other). For example, with the following declarations Rectangle r1 = new Rectangle(); Rectangle r2 = new Rectangle(new Point(2,2), 1, 4); the expression r2.above(r1) should give true, and r2.above (r2) should give false. (You can assume that the height of a rectangle is never negative.) (2) (5)
