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The following example explains what is wildcard argument and how it helps you to solve your problems. In the example, you have two classes called OracleEmployee and MicrosoftEmployee. Both are extending Emp class. You have a generic class called MyEmployeeUtil...

In the preceding examples, the type parameters could be replaced by any class type. This is fine for many purposes.
But sometimes it is useful to limit the types that can be passed to a type parameter.
For example, assume that you want to create a generic class that contains a method that returns the average of an array of numbers....

You can declare more than one type parameter in a generic type. To specify two or more type parameters, simply use a comma-separated list.
For example, the following TwoGenerics class has two type parameters: T and V.
/*

Generics automatically ensure the type safety of all operations.  In the process, they eliminate the need for you to enter casts and to type-check code by hand.
To understand the benefits of generics, first consider the following program that creates a non-generic equivalent of SimpleGeneric class in the previous posting:...