泛型方法:无论何时,只要你能做到,你就应该尽量使用泛型方法。也就是说,如果使用泛型方法可以取代整个类泛型化,那么就应该只使用泛型方法。
public class LinkedStack<T> {
private/* static */class Node<U> {
U item;
Node<U> next;
Node() {
item = null;
next = null;
}
Node(U item, Node<U> next) {
this.item = item;
this.next = next;
}
boolean end() {
return item == null && next == null;
}
@Override
public String toString() {
return "Node [item=" + item + ", next=" + next + "]";
}
}
private Node<T> top = new Node<T>();
public void push(T item) {
top = new Node<T>(item, top);
}
public T pop(){
T result = top.item;
if(!top.end()){
top = top.next;
}
return result;
}
public static void main(String[] args) {
LinkedStack<String> lss = new LinkedStack<String>();
for(String s : "Phasers on stun!".split(" ")){
lss.push(s);
}
String s;
while((s=lss.pop()) != null){
System.out.println(s);
}
}
}