I think the author's writing is so good that I have to save it.
Understanding of this example:
//Type parameters cannot use basic types. T and U are actually the same type.
//Every time new data is placed, it becomes a new top. Push the original top down one level and establish a link through the pointer.
//The end sentinel is a node created by the default constructor that is consistent with end() returning true.
Copy the code code as follows:
//: generics/LinkedStack.java
// A stack implemented with an internal linked structure.
package generics;
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; }
}
private Node<T> top = new Node<T>(); // End sentinel
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 ss;
while((ss = lss.pop()) != null)
System.out.println(ss);
//----- if put integer into the LinkedList
LinkedStack<Integer> lii = new LinkedStack<Integer>();
for(Integer i = 0; i < 10; i++){
lii.push(i);
}
Integer end;
while((end = lii.pop()) != null)
System.out.println(end);
//----- integer test end!
}
}
/* Output:
stun!
on
Phasers
*/