What is the purpose of garbage collection in java, and when is it used?

0 Answers  

---

What is the difference between abstract class and interface?

3 Answers   Aspire,

---

Can a serialized object be transferred via network?

0 Answers  

---

What is meant by packages?

4 Answers  

---

What is advantage of java?

0 Answers  

---

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)

0 Answers  

---

What is the range of the short datatype?

2 Answers  

---

what do you meant by Runtime Polymorphism?

13 Answers   BVIMR, IBM, Persistent,

---

How do you add an element to an arraylist in java?

0 Answers  

---

What is local variable and instance variable?

0 Answers  

---

can java object be locked down for exclusive use by a given thread? : Java thread

0 Answers  

---

Can a java program have 2 main methods?

0 Answers  

---