Java Interview Questions.Please Answer them?

[radhika743]

Dear Friends can you please help me with your answer's for the following Questions?

Q1.) Can we synchronize static variables ?

Q.2) Do u know where we instantiate BusinessDeligate in our struts appln ?

Q.3) How two jsp pages can maintain state ?

Q.4) Why oracle 4rth driver is named as oracle thin driver?

[radhika743]

If possible, would you please answer as many of these questions as you can ATLEAST?

[kkchaitanya_18]

hi
4ans:
Oracle also provides a Type 4 JDBC driver, referred to as the Oracle “thin” driver. This driver includes its own implementation of a TCP/IP version of Oracle’s Net8 written entirely in Java, so it is platform independent, can be downloaded to a browser at runtime, and does not require any Oracle software on the client side. This driver requires a TCP/IP listener on the server side, and the client connection string uses the TCP/IP port address, not the TNSNAMES entry for the database name.

[kkchaitanya_18]

In Struts ,we instantiate BusinessDeligate in our struts appln
It is used to remove dependecies between web and EJB componenet makes web componenet independent to EJB component
Seperates JNDI and EJB API access from web component
Develop one business deligate for each SFsession Bean.
To access life cycle frunction of SFSB business deligate must be provided with the same function signatured constructor(ejbcreate())
When client access the constructor of business delegate, the same will access the create() of SFSB to obtain remote object
List of functions defined business deligate must exactly match(count and signature ) with the business logic functgions of SFSB

Note:
Business Deligate need not be serialized and presence only required in client system.

[deepesh]

because static shares same copy for all instances and it does work globally..