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- Implement a class Stack <E> that manages an array list of elements of type E. Provide methods push, pop, and isEmpty. (JAVA)Write an iterable Stack client that has a static method copy() that takes a stackof strings as argument and returns a copy of the stack. Note : This ability is a primeexample of the value of having an iterator, because it allows development of such functionality without changing the basic API.Modify the Java class for the abstract stack type shown belowto use a linked list representation and test it with the same code thatappears in this chapter. class StackClass {private int [] stackRef;private int maxLen,topIndex;public StackClass() { // A constructorstackRef = new int [100];maxLen = 99;topIndex = -1;}public void push(int number) {if (topIndex == maxLen)System.out.println("Error in push–stack is full");else stackRef[++topIndex] = number;}public void pop() {if (empty())System.out.println("Error in pop–stack is empty"); else --topIndex;}public int top() {if (empty()) {System.out.println("Error in top–stack is empty");return 9999;}elsereturn (stackRef[topIndex]);}public boolean empty() {return (topIndex == -1);}}An example class that uses StackClass follows:public class TstStack {public static void main(String[] args) {StackClass myStack = new StackClass();myStack.push(42);myStack.push(29);System.out.println("29 is: " + myStack.top());myStack.pop();System.out.println("42 is:…
- Implement stack by creating user defined push() method for entering elements and pop() method for retriving elements In java.Implement a class called ReverseWords that uses a stack to output a set of elements input by the user in reverse order.Write a secure Bounded Stack class in Java, where the item type is string. Fail fast by throwing exceptions.
- The implementation of a queue in an array, as given in this chapter, uses the variable count to determine whether the queue is empty or full. You can also use the variable count to return the number of elements in the queue. On the other hand, class linkedQueueType does not use such a variable to keep track of the number of elements in the queue. Redefine the class linkedQueueType by adding the variable count to keep track of the number of elements in the queue. Modify the definitions of the functions addQueue and deleteQueue as necessary. Add the function queueCount to return the number of elements in the queue. Also, write a program to test various operations of the class you defined.Implement an postfix-to-infix translator using stacks. The applicationshould repeatedly read a postfix expression and print the equivalentinfix expression until the user quits. Throw an exception if the postfixexpression entered is invalid.Consider class IntArrayStack that has two instance variables: int[] data and int top. Implement an instance method inside the IntArrayStack, called popBottom(),that extracts and returns as output the element at the bottom of the stack. All other elements in the stack must remain unchanged and in the same order.
- I need help fixing this Java code to output as it's explained in the image below: import java.util.Stack; public class BXT { private TreeNode root; public void buildTree(String postfix) { Stack<TreeNode> stack = new Stack<>(); String[] tokens = postfix.split(" "); for (String token : tokens) { if (isOperator(token)) { TreeNode right = stack.pop(); TreeNode left = stack.pop(); stack.push(new TreeNode(token, left, right)); } else { stack.push(new TreeNode(token)); } } root = stack.pop(); } public double evaluateTree() { return evaluateTree(root); } private double evaluateTree(TreeNode node) { if (isOperator(node.getData())) { double left = evaluateTree(node.getLeft()); double right = evaluateTree(node.getRight()); switch (node.getData()) { case "+": return left +…Write a non-recursive Java method for printing all permutations of the numbers {1,2, ..., n}Hint: use an explicit stackpublic class QueueByStack<E> {Stack<E> a = new Stack<>();Stack<E> b = new Stack<>(); public int size() {//write code here} public boolean isEmpty() {//write code here} public void eneque(E e) {//write code here} public E deque() {//write code here} public E first() {//write code here} @Overridepublic String toString() {//write code here}}Implement generic class ArrayStack as discussed in the lectures having following methods: constructor, push, pop, peek, isEmpty, copy constructor, reallocate (private method). Also add following methods to this class: size: returns number of elements in the stack. contains: Search an element in the stack. If found returns true, else returns false. clear: Deletes all elements of the stack and make it empty stack.