Answer / ranganathkini

All of Java's primitive data types have an associated
Wrapper class. These wrapper classes provide useful
functions such as conversion or comparisons most of which
are used by Java implicitly.

Also a wrapper serves as a container for primitive values in
conditions where a reference type is expected.

Answer / manikandan [ gtec,vellore ]

there are different type of data types such as int,char
etc.for example suppose if we using arrays it can store a
similar data types but we need to store a char and int in a
same array what can we do for this situation. the wrapper
class helps in this situation by storing a objects in to a
arrays.

example

ArrayList v=new ArrayList();
v.add(new Integer(1));
v.add(new Character('a'));//

the int and char are different type but we stores it by an
object.

Answer / zoozoo

because primitive datatypes cannot directly be used through network, like we cannot send them to one n/w to another. so by using wrapper classes to wrap them into objects, which can be sent through n/w.

Answer / aditya mohata

These classes are Wrapper classes.We hav them as we cant
pass an primitive directly through an method to different
class.So we need wrapper classes to convert them to their
already defined classes.Send them n again unpack them.

class{ ... ... interface myinterface{ ... ... } abstract class{ .. .. } ... .. .. } is this possible to write "Interface and/ or Abstract class inside a class ? if possible whcich one is possible is only interface? is only abstract?

2 Answers   Logica CMG,

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