Define block in java.

BLOCKS IN JAVA:—————————————————————————–

  • A block  is a set of instruction define in curly braces ({}) block doesn’t have any name so you cannot invoke the block explicitly  . block  doesn’t   have any  name so you cannot invoke by the jvm automatically.
  • Blocks define inside the class directly as member are called as intilization block.
  • there are two types of initialization block.
  • 1.Instance initialization block(IIB)
  • 2.static initialization block.(SIB).
  • Instance initialization block(IIB)——————-

Block define inside the class directly without static modifier is called as instance initialization blocks.

Instance:-

will be invoke by the jvm automatically after initializing the object .

  • creating object is necessary in IIb.
  • how much time we create abject then the same no of time of the IIb is called.
  • IIb is called when the class of object is created.

synatax

{

// IIB block

 

}

 

.

 

Introdcution of Servlets..

Defination of servlets.

Servlet are the modules that run inside request/response oriented services .such as java enabled web servers.

AS they are java based they are more platform independent.

Eample:—

processing data passed over https using on html form ,including purchase order.

Allowing collection between people a servlet can handle multiple requests concurrently they can synchronizerequest to support system such as on line conferencing .

forwarding requests servlets can forward requests to other services and servlets.

different methods of servlets.:—–

1.doGet():-  for handling get .conditional get requests

2.dopost():- for handling post requests .

3.do put():-for handling put requests.

4.do Delete():- for handling delete requests