please i need this asap in java ill upvote

QUESTION 4: [4 POINTS] Write a static method called getFirst that accepts an integer stack stk. Your method should return the element that has been added first to the stack. If stk is empty then return -1. Make sure that the stack content does not change when method finish its execution. public static Integer getFirst (ArrayStack stk) {// write your code below this line QUESTION 5: [5 POINTS] Write a static method called insertAtFront that receives two parameters: an integer queue and an integer array f. The method should insert the content of the array f at the front of the queue. The queue is large enough to store all array elements. public static void insertAtFront (ArrayUnbndQueue q, int [] f) { Assume you have the following list of nodes: 3 1-111-71-7146 Answer the following questions: A. Delete the first node (1 Point) B. Insert a new node which stores the value 3 just after the node w. (2 Points) QUESTION 4: [4 POINTS] Consider the following linked list with three references list, a and b to answer the following: 18 32 74 16 43 87 25 44 list 1-41 a b 4.1 What is the output for each of the following statements: a) System.out.println (list.getInfo(); [1 point] [0.5 point] b) System.out.println (b.getLink().getLink().getInfo()); [0.5 point] 4.2 Write Java statement(s) to do the following: a) Set the value of the node containing 43 to be 55 using reference variable a. [3 points) [0.5 point] b) Write Java statement(s) to delete the node with info 25 using the reference variable b. [0.5 point c) Write Java statement(s) to create a new node called newNode with a value of 10 in its info, and then add it to the beginning of the list above. The list reference should refer to the beginning of