What is inner class?what is the use of inner class?where we
create the object for inner class? and inner class can
extend any class or inner class can implement any interface?
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)
27
Hi friends am new to java. I read jar file means collection
of java files. For executing struts application what are
the necessary jar files. " struts.jar " file contains
what. can u explain
21
We can write any Java Logics in our JSP. Then why we are
using servlets(Controller Layer) to interact with the DAO ?
Which Component subclass is used for drawing and painting?
129
What are parent methods and how can you call them?
196
I am unable to find or learn about print command. I have a
graphical program in core java in applet but i want to give
print command but i have coding for that so if anyone know
about this plz mail me on avdhesh_chauhan007@yahoo.co.in
98
Write the program numbers into words.For example
2345==two thousand three hundred fourty five
Difference between a MenuItem and a CheckboxMenuItem?
199
There is a Banking application. It has 2 types of account,
Savings and Current. Write a method calculateInterest by
passing an ArrayList of these account objects and calculate
Interest accordingly. Write code for this situation
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