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- PYTHON class BSTnode: def __init__(self, key = None, left = None, right = None, parent = None): # Initialize the a node. self.__key = key # value for the node self.__left = left self.__right = right self.__parent = parent def setkey(self, newkey): # Sets the key value of the node to newkey ####################################################################### # Remove the pass and write your code ####################################################################### pass ####################################################################### # End code ####################################################################### def getkey(self): # returns the key value of the node ####################################################################### # Remove the pass and write your code #######################################################################…import java.util.*;public class MyLinkedListQueue{ class Node { public Object data; public Node next; private Node first; public MyLinkedListQueue() { first = null; } public Object peek() { if(first==null) { throw new NoSuchElementException(); } return first.data; } public void enqueue(Object element) { Node newNode = new newNode(); newNode.data = element; newNode.next = first; first = newNode; } public boolean isEmpty() { return(first==null); } public int size() { int count = 0; Node p = first; while(p ==! null) { count++; p = p.next; } return count; } } } Hello, I am getting an error message when I execute this program. This is what I get: MyLinkedListQueue.java:11: error: invalid method declaration; return type required public MyLinkedListQueue() ^1 error I also need to have a dequeue method in my program. It is very similar to the enqueue method. I'll…You may have found it somewhat tedious and unpleasant to use the debugger and visualizer to verify the correctness of your addFirst and addLast methods. There is also the problem that such manual verification becomes stale as soon as you change your code. Imagine that you made some minor but uncertain change to addLast]. To verify that you didn't break anything you'd have to go back and do that whole process again. Yuck. What we really want are some automated tests. But unfortunately there's no easy way to verify correctness of addFirst and addLast] if those are the only two methods we've implemented. That is, there's currently no way to iterate over our list and get bad its values and see that they are correct. That's where the toList method comes in. When called, this method returns a List representation of the Deque. For example, if the Deque has had addLast (5) addLast (9) addLast (10), then addFirst (3) called on it, then the result of toList() should be a List with 3 at the…
- Assignment Apex: Apply SOQL on Contact to get the Contacts for Account those we got from 1st SOQL: Add a new method: Name: getContactInformationForSpecificAccount Return Type: Map> args: ListLink List with GraphicsFor this project you will be creating a link list and drawing the nodes to the screen. Each node will be drawn as a rectangle. Each node will have the ability to link to at least 4 other nodes. Create a SDL2 project to open a graphics window for this assignment. Set the background color to something dull. Create a Node structure as follows to create the nodes for the link list. Node:• rectangle SDL_Rect• color SDL_Color or rgb values, your choice• 4 Node pointers (links)• draw() Draws a solid (filled) rectangle• Node() Add arguments to your constructor(s) as you see fitBefore your main loop create 5 Node objects on the heap. Link the nodes to each other in the pattern shown below. Begin by linking each node to the node adjacent to it. The center node will be linked to all 4 surrounding nodes. Then link each outer node to the node on the opposite side, creating a wraparound effect as indicated by the green arrows. Create a Node pointer called current and set it…Below you're given a Node class and a LinkedList class. You will implement a method for the LinkedList class named "delete48in148". That is, whenever there is a sequence of nodes with values 1, 4, 8, we delete the 4 and 8. For exCample, Before: 1 -> 4 -> 8 LAfter: 1 Before: 7 -> 1 -> 4 -> 8 -> 9 -> 4 -> 8 After: 7 -> 1 -> 9 -> 4 -> 8 Before: 7 -> 1 -> 4 -> 8 -> 4 -> 8 -> 4 -> 8 -> 9 After: 7 -> 1 -> 9 Note from the above example that, after deleting one instance of 48, there may be new instances of 148 formed. You must delete ALL of them. Requirement: Your implementation must be ITERATIVE (i.e., using a loop). You must NOT use recursion. Recursive solutions will NOT be given marks. import ... # No other import is allowed
- package com.example.myapplication;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ListView;public class PlayerActivity2 extends AppCompatActivity {ListView simpleList;String SerialNo[] = {"1", "2", "3", "4", "5", "6","7","8","9","10"};int flags[] = {R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4, R.drawable.image5, R.drawable.image6, R.drawable.image7, R.drawable.image8, R.drawable.image9, R.drawable.image10};String Names[] = {"mmm", "nnn", "aaa.", "bbb", "ccc", "ddd","eee jk"," ijk","Virgil jk","gil jklk"};String Score[] = {"1", "2","3", "5", "4", "3","5","5","5","5"};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity2);simpleList = (ListView)findViewById(R.id.simpleListView);//ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,…package psa.naloga1;public class Binarno {private NodeBinarno root;public boolean insert(int element){if(search(element)){return false;}root=insertNode(root,element);return true;}private NodeBinarno insertNode(NodeBinarno node,int element){if(node==null){NodeBinarno insertedNode=new NodeBinarno(element);return insertedNode;}if(element<node.getKey()){node.setLeftChild(insertNode(node.getLeftChild(),element));}else if(element>node.getKey()){node.setRightChild(insertNode(node.getRightChild(),element));}return node;}private NodeBinarno deleteNode(NodeBinarno node,int element){if (node==null){return node;}if(element<node.getKey()){node.setLeftChild(deleteNode(node.getLeftChild(), element));} else if (element > node.getKey()) {node.setRightChild(deleteNode(node.getRightChild(),element));}else{if(node.getLeftChild()==null){return node.getRightChild();}else if(node.getRightChild()==null){return…It is python language Write the code that creates a new Node class. It will store data and next attributes. You only need to create the __init__ method. data and next variables will have default values, both set to None. Assume you are using the Node class from the previous connection to create a LinkedList. You have the code below, create a method that removes the first node from the LinkedList. class LinkedList: def __init__(self): self.head = None Based on the code from the last two questions, create a new LinkedList. Add 2 values to the LinkedList (there is an add method that accepts data as an argument, called add). Then call the removeFront method created in the previous question. Based on the previous questions, create a Queue class that uses the LinkedList for its data storage. Create the __init__, isEmpty, insert, remove, and size methods. Assume that LinkedList class has the add, removeFront and size methods defined. Based on the LinkedList code already…
- SingleLinkedList head- Node next - data- String value = "Tom" Node next- data- String value = "Dick" Node nodeRef = nodeRef.next; nodeRef.next = new Node("Peter"); next- data- String value="Harry" What change will be made to the list after the following codes are run? Node nodeRef = head; While (nodeRef.next!=null) Node next = null data- String value="Sam"class LinkedList { Node head; Node tail; Node findNodeWithData(int data); void addDataAfterNode(int data, Node noderef); } class Node {private int data; private Node next;public void setNextNode(data); public Node getNextNode(); }2. What JUnit test cases will you create for the LinkedList class: a. void findNodeWithData(int data); b. addDataAfterNode();3. Write your JUnit test case for testing the two methods aboveJavaScript The jQuery "post" method that we used in this course to enable "round-trip" dialog with the node.js server has the form: $.post("/", x, y); Describe the type and purpose of the x and y parameters.