Explanation of Solution
Constraining a type parameter of a generic class with an upper bound:
“Yes”, type parameter of generic class can be constrained with an upper bound using the keyword extends.
Explanation:
- The keyword extends is used to restrict the type parameter of generic class.
- A type to an upper bound is constrained by the keyword extends.
- In order to declare the type parameter with an upper bound, the developer list the name of type parameter, followed by the keyword extends, and followed by its upper bound.
- Example:
public class exam<T extends Number> //Line1
{ //Line2
private T to; //Line3
private T ra; //Line4
public exam(T tot, T rank) //Line5
{ //Line6
to= tot; //Line7
ra=rank; //Line8
} //Line9
public static void main (String[] args) //Line10
{ //Line11
exam<Integer> e1= new exam<>(2,3); //Line12
exam<Double> e2= new exam<>(466...
Explanation of Solution
Constraining a type parameter of a generic class with a lower bound:
“Yes”, type parameter of generic class can be constrained with lower bound using the keyword super.
Explanation:
- The keyword super is used to restrict the type parameter.
- A type to a lower bound is constrained by the keyword super.
- In order to declare the type parameter with lower bound, the developer list the name of type parameter, followed by the keyword super, and followed by its lower bound.
- Example:
public class exam<T super Integer> //Line1
{ //Line2
private T to; //Line3
private T ra; //Line4
public exam(T tot, T rank) //Line5
{ //Line6
to= tot; //Line7
ra=rank; //Line8
} //Line9
public static void main (Str...
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Starting Out with Java: From Control Structures through Data Structures (3rd Edition)
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