Question

Given the following declaration, what is the type parameter in Stack replaced with?

private Stack myStack = new Stack();

a. Object
b. int
c. String
d. it is a compiler error

Answer 1

In the given Java code declaration without generics, the type parameter in Stack is replaced with Object, allowing the stack to hold any type of reference object.

Step-by-step explanation:

When you see the declaration private Stack myStack = new Stack(); without generics specified, Java uses type erasure to replace the type parameter with the default, which is Object. This means that the stack is capable of holding items of any reference type. No specific type was specified with this declaration, so there is no type safety and objects retrieved from the stack must be cast to the desired type at runtime. This practice is discouraged in modern Java code as it doesn't take advantage of the strong type checking provided by generics.