Java代写代考

package linear; import java.util.NoSuchElementException; public class Stack { private Node front; private int size; public Stack() { front = null; size = 0; } public void push(T item) { front = new Node(item, front); size++; } public T pop() throws NoSuchElementException { if (front == null) throw new NoSuchElementException(); T temp = front.data; front = […]

SOFT2201/COMP9201 Tutorial 11 Singleton & Decorator & Façade Question 1: Singleton Pattern Singleton is one of the easiest patterns to implement once you know it, but is one of the easiest to use poorly – it effectively creates a ’fancy’ global variable(s). Consider our stickman scenario, what opportunities might exist for the use of the

package linear; import java.util.ArrayList; //import the class in order to use it import java.util.NoSuchElementException; public class StackUsingArrayList { private ArrayList list = new ArrayList(); public void push(T v) { list.add(v); } public T peek() { return list.get(list.size()-1); } public T pop() throws NoSuchElementException{ if(list.size() == 0) throw new NoSuchElementException(); return list.remove(list.size()-1); } public boolean isEmpty()