Consider the following code snippet:
public class Box<E>
{
private E data;
public Box() { ...}
public void insert(E value) { ...}
}
Which of the following is a valid Box<E> object instantiation?
i.Box<Object> box = new Box<>() ;
II.Box<Boolean> box = new Box<>() ;
III.Box<double> box = new Box<>() ;

Question

Consider the following code snippet: public class Box { private E data; public Box(){ ...} public void insert(E value) { ...} } Which of the following is a valid Box object instantiation? i.Box

Quizplus · Accepted Answer

The first instantiation creates a Box object that can hold any type of object since it is parameterized with Object.
The second instantiation creates a Box object that can only hold Boolean values.
The third instantiation is invalid since double is a primitive type and cannot be used as a type parameter, Box<Double> would be valid.

Consider the Following Code Snippet