Generics and the ArrayList Class - Absolute Java - page 792

SYNTAX (FOR CLASS DEFINITION HEADINGS)
public class Class_Name
< Type extends Ancestor_Class & Interface_1 & Interface_2 & ...
...& Last_Interface >
If there are multiple type parameters, they are separated by commas. There can be any
number of interfaces but only one ancestor class for each type parameter.
EXAMPLES
public class Pair<T extends Comparable>
public class MyClass<T extends Employee & Comparable>
public class YourClass <T1 extends Employee & Comparable
& Cloneable, T2 extends Comparable>
Employee is a class. Comparable and Cloneable are interfaces.

TIP: Generic Interfaces

An interface can have one or more type parameters. The details and notation are the
same as they are for classes with type parameters.

■

Generic Methods ★
(This is a starred subsection because it is needed only for Chapter 16, which covers
the Java collection classes. If you choose to read Chapter 16, you will need to read this
subsection first.)
When you define a generic class, you can use the type parameter in the definitions
of the methods for that generic class. You also can define a generic method that has its
own type parameter that is not the type parameter of any class. This generic method
can be a member of an ordinary (nongeneric) class or a member of some generic class
with some other type parameter. For example,

public class Utility
{
...
public static <T> T getMidpoint(T[] a)
{
return a[a.length/2];
}
public static <T> T getFirst(T[] a)
{
return a[0];
}
...
}