generics problemis to avoid type cast problem is i correct

1. http://www.developer.com/open/article.php/3693491/TIP-Taking-Advantage-of-Java-Generics.htm

2. http://www.javaworld.com/javaworld/jw-06-2001/j1-01-sintes3.html?page=1

3. http://www.javacodegeeks.com/2011/04/java-generics-quick-tutorial.html

Generics' intention is to avoid type cast problems during runtime . By using generics , you can strictly specify with which types you want your routine to work . The compiler restricts clients(callers) to use the routine by passing only those types  and nothing else . Thus , compiler makes that type checking instead of the runtime . So ,if you have any bad callers , then it is detected at compile time instead of ending up with a surprise at runtime.

is it jdkk1.5 feature or jdk1.6 features

I'm sure you'd agree that we can use the function defined immediately above because it is designed to take in only ints.

That was supposed to say "can not" in my comment.

is it jdkk1.5 feature or jdk1.6 features

According to Wiki, they came with Java 5.