// There are some things that only LinkedLists can do: 只有linkedLists可以做的
public static void testLinkedList() {
LinkedList ll = new LinkedList();
Collection1.fill(ll, 5);
print(ll); // Treat it like a stack, pushing:
ll.addFirst("one");
ll.addFirst("two");
print(ll); // Like "peeking" at the top of a stack:
System.out.println(ll.getFirst()); // Like popping a stack:
System.out.println(ll.removeFirst());
System.out.println(ll.removeFirst());
// Treat it like a queue, pulling elements off the tail end:
System.out.println(ll.removeLast());
// With the above operations, it's a dequeue!
print(ll);
}
// Producing a Collection of the values:
public static void printValues(Map m) {
System.out.print("Values: ");
Collection1.print(m.values());
}
// Producing a Set of the keys:
public static void printKeys(Map m) {
System.out.print("Size = " + m.size() + ", ");
System.out.print("keys: ");
Collection1.print(m.keySet());
}
// Wrap Collection1.fill() for convenience:
public static List fill(List a) {
return (List) Collection1.fill(a);
}
