java code for a Queue class (with all the standard queue methods) using a singly linked list. Assume that the enqueue(), dequeue() and peek() methods are never called on a queue of size less than two. include the runtime of each method.

2.java code for a stack class for zebs(zeb objects-instances of a class called zeb) with all the standard stack methods using an array. include a field declarations and a constructor. Assume pop() and peek() methods are not called on an empty stack. Also assume that you know the maximum number of elements ever needed to be held in the stack. Include the runtime of each method.