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//: generics/LinkedStack.java
// A stack implemented with an internal linked structure.
package generics;
public class LinkedStack<T> {
private static class Node {
T item;
Node next;
Node() { item = null; next = null; }
Node(T item, Node next) {
this.item = item;
this.next = next;
}
boolean end() { return item == null && next == null; }
}
private Node top = new Node(); // End sentinel
public void push(T item) {
top = new Node(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);
}
} /* Output:
stun!
on
Phasers
*///:~
private static class Node<T> {}