Java Interview Questions

When a new Socket is created new port number should be allocated.
When the service on the same socket is changed, a new port number should be alloted.
Note :- Some alloted port numbers :
port no. Application
13                                    Date and time Services
21                                    FTP,Which transfers files
23                                   Telnet,Which provides remote login
25                                   SMTP,Which delivers mail messages
67                                   BOOTP,Which provides configuration at  boot [...]

Rep) Sets (or) set Classes will not allow duplicate values

Ques) What is LoadFactor?
Rep) LoadFactor is useful to determine the point where the capacity of the Hashtable (HashMap) will be doubled For Hashtable initial capacity * loadfactory–>11 * 0.75=8
This class implements a hashtable, which maps keys to values. Any non-null object can be used as a key or as a value.To successfully store and retrieve [...]

Q) What is Collection FrameWork?
Res) A Collection FrameWork represents a class library to handle groups of objects
–> Collection framework is implemented in Java.Util.Package.
–> Collection does’t store copy of all the object, but it stores references of all objects.
–> Collection classes will act upon only referenced datatypes they do not act upon primitive datatypes.