What is Generic in java? Where can we write Generic ( class or method or

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Question

What is Generic in java? Where can we write Generic ( class or   method or objects or etc...)? with simple example?
Thanks, Bose.

Question Submitted By :: Bose

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Re: What is Generic in java? Where can we write Generic ( class or method or objects or etc...)? with simple example? Thanks, Bose.

Answer
# 1

The feature of Generics in Java allows Applications to
create classes and objects that can operate on any defined
types. Programmers can now make use of the Generics feature
for a much better code. There is no need for un-necessary
casting when dealing with Objects in a Collection.
Example without using generics
// Removes 4-letter words from c. Elements must be strings
static void expurgate(Collection c) {
for (Iterator i = c.iterator(); i.hasNext(); )
if (((String) i.next()).length() == 4)
i.remove();
}

Here is the same example modified to use generics:

// Removes the 4-letter words from c
static void expurgate(Collection<String> c) {
for (Iterator<String> i = c.iterator(); i.hasNext(); )
if (i.next().length() == 4)
i.remove();
}

Is This Answer Correct ?

32 Yes

1 No

Inder_gwl
[Ness Technologies]

Re: What is Generic in java? Where can we write Generic ( class or method or objects or etc...)? with simple example? Thanks, Bose.

Answer
# 2

Generics can accept any datatype.
For example if the method write()takes integer type,but we
send them strings,is it possible for the mehod it takes
general variables,but it is possible using generics in java.

just use 'T' Synbol infront of ur method
eg- <T> write();

Not only for method it will be used in front ofclasses

<T>class gen{

int t1=1;
int t2=2;

String s1="generics"
String s2="example";

<T> write(<T> arg1,<T> arg2){
this.arg1=arg1;
this.arg2=arg2;
}
void display()
{
System.out.println(arg1+" "+arg2);
}
}

class example{
public static void main(String args[])
{
Gen g= new Gen();
g.display(t1,t2);
g.display(s1,s2);
}
}

Output is 1 2
Generics example

note# just i told u what i have known,if any thing is wrong
in this just tell me what is the corect way.

Thank u,
vamsi.

Is This Answer Correct ?

13 Yes

6 No

Vamsi

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