Change the iterator function in Stack to throw a java.util.If the client updates the collection (through push() or pop()) during iteration, ConcurrentModificationException is thrown.
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Change the iterator function in Stack to throw a java.util.If the client updates the collection (through push() or pop()) during iteration, ConcurrentModificationException is thrown. b)
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- Modify the iterator code in Stack to immediately throw a java.util.ConcurrentModificationException if the client modifies the collection (via push() or pop()) during iteration? b)Write a Reverse Polish Notation (RPN) calculator in Java. Write a Stack class for doubles: constructor and push, pop, empty, peek functions. Use an array implementation for the stack (or a linked list if you did this before class on 3/5). If you want, you can limit the stack size to ten (HP only had three on their first attempt!), but in that case you should make your push do nothing if the stack is full. Most modern stack implementations have no arbitrary size limit. The pop and peek methods should throw an exception if they are called on an empty stack (see code for this below). Write a RPN class: constructor (takes a String expression, e.g. "3 4 5 + *") and an evaluate method which returns a double ("3 4 5 + *" would evaluate to (4+5)*3=27). Write a RPNCalculator class: main method with whatever accouterments you see fit. Allow the user to type in an expression, then evaluate it and repeat until they say quit.The PostfixEvaluator class uses the java.util.Stack class to create thestack attribute. The java.util.Stack class is one of two stack implementationsprovided by the Java Collections API. We revisit the other implementation, theDeque interface, in Chapter 13.The evaluate method performs the evaluation algorithm described earlier, supported by the isOperator and evalSingleOp methods. Note that in the evaluatemethod, only operands are pushed onto the stack. Operators are used as they areencountered and are never put on the stack. This is consistent with the evaluation algorithm we discussed. An operand is put on the stack as an Integer object, insteadof as an int primitive value, because the stack collection is designed to store objects.When an operator is encountered, the two most recent operands are poppedoff the stack. As mentioned above, the first operand popped is actually the secondoperand in the expression and that the second operand popped is the first operandin the expression.…
- Break out the restrictions placed on the stack and its unrestricted counterpart.Create a new Java class in a file named "ListPQ.java" that implements the Queue interface and uses the LinkedList provided by the JCF to implement a priority queue. Note that LinkedList does not automatically order values based on priority, so it will be up to you to make sure that values are removed in priority order. You should try to implement your priority queue as efficiently as possible - basic operations should run in constant or linear time. Your priority queue need only work with integers. Do not modify any of the provided code. //This is ArrayHeap (provided code) import java.util.Arrays; public class ArrayHeap implements Heap { private int[ ] array; private int size; public ArrayHeap() { array = new int[3]; size = 0; } @Override public void add(int value) { // add pt 1 if(size == array.length) { array = Arrays.copyOf(array, size*2); } array[size] = value; // sifting up int child = size; int parent = (child - 1) / 2; while(array[parent] > array[child]) { swap(parent,…Each recursion causes a new activation frame to be placed on the stack.true of false?
- Write a method moveUp for the ArrayBoundedStack class. The method has a parm named item (type T). moveUp finds the first occurrence of item (the occurrence closest to the top of the ti ww stack) and moves it to the top. Throw NoSuchElementException if item is not in the stack. DO NOT USE ANY METHODS OF THE STACK CLASS. For example, here is the before and after if item is "blue". "red" "blue" "green" "red" before: "purple" after: "green" "purple" "yellow" "blue" "yellow" "blue" "blue"write a code in modules and also with main class to implement the operation on linked list.. (searching , traversing , updating , and inserting.) insertion will be In empty list, In front of list, In the middle of list, at the end of list. The code should be in java language and also with simple coding and explanation.a. Write the recursive method for adding a node in a linked list. b. Consider the infix expression 15 + 2 – 10 / 2 ∗ 2 and convert this into postfix expression using stack. Next Token Action Effect on operatorStack Effect on postfix 15 + 2 - 10 / 2 * 2
- Objectives: The code for the different stack and queue operations in both implementations (array and linked list) are discussed in the lectures: and are written in the lectures power point. So the main object of this assignment is to give the student more practice to increase their understanding of the different implementation of these operations. - The students also are asked to write by themselves the main methods in the different exercises below; The Lab procedures: The following files must be distributed to the students in the Lab // it represents an array implementation of the stack. // it represents a Linked List implementation of the stack. arraylmpofStack.java pointerlmofStack.java pointerlmofQueue.java // it represents a pointer implementation of the queue. Then the students by themselves are required to write the code for the following questions Ex1) Given the file arraylmpofStack.java then write a main method to read a sequence of numbers and using the stack operation print…I need to write some java code evaluating postfix of some expressions. I must use the object stack given to me and cant use a linkedlist. This is the method I am given: static double evaluatePostfixExpression (String expression) { Stack aStack = new Stack(); } These are a few of the expressions: e 4 3 ! + e 3 1 22 / / - +Assume class MyStack implements the following StackGen interface. For this question, make no assumptions about the implementation of MyStack except that the following interface methods are implemented and work as documented. Write a public instance method for MyStack, called interchange(T element) to replace the bottom "two" items in the stack with element. If there are fewer than two items on the stack, upon return the stack should contain exactly two items that are element.