Java Language rule are such that we must implement all the
methods of an interface even if we put them into empty
braces.i.e. we must override all the methods declared in
the interface.
But we can create our classes as subclasses of one of
the adapter classes, then we need to override only some of
the methods we need. i.e, An adapter classes provide empty
implementation of all methods declared in an EventListener
interface.
In java programming language, adapter class is used to
implement an interface having a set of dummy methods. The
developer can then further subclass the adapter class so
that he can override to the methods he requires.
Implementing an interface directly, requires to write all
the dummy methods. In general an adapter class is used to
rapidly construct your own Listener class to field events.
in a java programming language if you have a not all method
use but only selected method used at that time you can use
adapter class.you can use either one or all method.
Adapter classes are empty implementation of the methods provided by their corresponding interfaces.
if we implements the interface we have to give definition to all methods of interface.
but if we extend adapter class then we will require to define method which we gonna use in our code
An adapter class is a class that provides a dummy (empty)
implementation for an interface. That way someone who wants
to implement the interface but does not want or does not
know how to implement all methods, can use the adapter class
instead, and only override the methods he is interested in.
we can create our classes as subclasses of one of
the adapter classes, then we need to override only some of
the methods we need. i.e, An adapter classes provide empty
implementation of all methods declared in an EventListener
interface.
I have an HashMap object, which has with key and value pair.
It has 10 keys and values in that object. Now the question
is I want insert new key and value in middle or any where in
that list but not at the end or at the top. Is it possible
or not. If yes how can we achieve this one?
84. try {
85. ResourceConnection con =
resourceFactory.getConnection();
86. Results r = con.query(”GET INFO FROM CUSTOMER”);
87. info = r.getData();
88. con.close();
89. } catch (ResourceException re) {
90. errorLog.write(re.getMessage());
91. }
92. return info;
Which is true if a ResourceException is thrown on line 86?
1 Line 92 will not execute.
2 The connection will not be retrieved in line
85.
3 The resource connection will not be closed
on line 88.
4 The enclosing method will throw an exception
to its caller.
I have 100 records in a table with two rows. I need to
display 10 records per page like Google Search. I need only
the Logic(Pagination) in Pure Java. No JSP and all..Thanks
in Advance...
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