In Java why we write public static void main(String args[])
why not main()?
Answer Posted / sanjay gupta
public static void main()
1> Main() is the entry point of the program. Rather we can
say it is the main gate to enter inside the apartment. It
should be public because the compiler need to enter inside
the method (The guest need to access the apartment to reach
the security guard).
Public--> Compile whos is from another instance need to
access this method.
Statis --> Since main method is written inside a class and
to access a method of a class we need to create an object
of that class first. Since main() is the method which
compiler nned to call before creating any object of that
class we need to declare main as static. Static methods can
be called directely by using the class name. Thats why the
neame of the file should be same as the name of the class
contain main() method.
Void--> Since the method can return any type of valu or it
might not return anything also so the comiler is designed
in such a way that it should not take any return value so
we declare main as void type.
For further information please reach me at
sanjaygupt1011@gmail.com
Thanks~
Happy Programming...
| Is This Answer Correct ? | 88 Yes | 12 No |
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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)
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