Classes might contain only code or data but may also contain both.
A class is declared by keyword class and it can be complex in
nature.
 |
| Diagram of Classes and Methods |
Syntax:
Class classname
{
Type
instance-variable a;
Type
instance-variable b;
.
.
.
Type instance-variable
n;
}
Type method a (parameter-list)
{
//body of method
}
Type methodname a (parameter-list)
{
//body of method
.
.
}
Classes are also called the box which defines variable- width,
height and depth.
Example
Class box
{
Double width;
Double height;
Double depth;
}
Class that implements stack of data and integer.
Example
Class stack
{
Int stk [] = new
int [10];
Stack ()
Tos=-1
}
Void push (int item) {
If (tos==9)
System.out.println
(‘it’s full”);
Else
Stk [++tos] =
item;
}
Int pop ()
{
if (tos<0)
{
System.out.println
(“stack underflow”);
Return
0;
}
else
Return
stk[tos—];
}
}
