The first method that is invoked in a stand alone Java app
is the 'main' method which must have the following signature:

public static void main( String[] args )

init()
start()
paint()
stop()
destroy()

java.awt.Window

The >> operator carries the sign bit when shifting right.
The >>> zero-fills bits that have been shifted out.

Static variables:
     There is only one copy of static variable and even 
when the class is instatiated, the value remains the same.

Non-static variables:
    Every time the class is instatiated, the objest has 
their own copy of these variables.

static variables are class variables and the values remains 
same fr the whole class
nonstatic variables are of two kinds
global variables:are the variables which defines variables 
which can be accesible over the whole class
local variables:the scope of local variables is with tin 
the method only

front end means which u going to have look and feel like 
jsp,swings,awt pakage 
 back end menas which is going to implement the business 
logic for you

front end is html or UI elements
back end is the database or persistent storage

When a thread yields, its execution is paused and loses
ownership of the monitor lock giving other waiting threads a
chance to run.

When a thread sleeps, its execution is paused for the
specified duration during such an idle period, the thread
continues to retain the ownership of the monitor lock.

yield() method will suspend all the same priority thread 
which is running and gives chance to next thread to run 
which is of the same priority
sleep() method will make the thread to sleep for a 
particular period of time which is specified in the 
argument list

The 'throw' statement initiates an exception to be thrown
where as the 'throws' clause declares that the method is
expected to throw 1 or more checked execptions.

'throw' exception is thrown manually and 'throws' exception 
is thrown predefindly.

throw will declare an exception 
throws will throw the exception to the calling method

The prefix ++ operator first increments the value by one and
then returns the new value.

The postfix ++ operator first returns the value and then
increments it.

prefix will increment first and assigns to the variable
postfix will assing the value to the variable and then 
increments

The paint method causes the component and and all its parts
to be painted on the Graphics context tat is passed in as
parameter.

If the component is a light-weight component, then a call to
the component's repaint method which invokes the paint
method as soon as possible. If the component is not a
light-weight component, then calling repaint is the same as
calling the update method.

String class is immutable i.e oncle created the value 
cannot chage.

Stringbuffer class is mutable.The value can change.

yes, String is a immutable that means once the string 
object is created it cannot be changed.

String Buffer: it is a mutable,this object is changed if we 
make any modifications.

JDK 1.1