Java Reference
In-Depth Information
this.element = element;
}
public Cell(E element, Cell<E> next) {
this.element = element;
this.next = next;
}
public E getElement() {
return element;
}
public void setElement(E element) {
this.element = element;
}
public Cell<E> getNext() {
return next;
}
public void setNext(Cell<E> next) {
this.next = next;
}
}
The class is now declared as Cell<E> (which is read as " Cell of E "). E
represents the type of element that a cell object can hold. In this gen-
eric version of Cell , everywhere that Object was used in the original Cell
class now uses the name E . E is known as a type variable for which
a concrete type can be substituted. There's nothing special about the
name E it could be ElementType , for examplebut E is a nice abbreviation for
"element." By convention, type variables have single character names:
E for an element type, K for a key type, V for a value type, T for a general
type, and so forth.
To create an actual Cell object you have to tell the compiler what spe-
cific type you wish to replace E with. For example, a Cell to hold a String
could be constructed and referenced as follows:
Cell<String> strCell = new Cell<String>("Hello");
 
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