Fill In The Blank. Hint: look at the declaration of a HashMap in the code above. What do we declare for key and value? Because a HashMap requires both keys and values, we must provide the declare it. for both the key and the value when we

Fill In The Blank. Hint: look at the declaration of a HashMap in the code above. What do we declare for key and value? Because a HashMap requires both keys and values, we must provide the declare it. for both the key and the value when we

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Multiple choice in java Given the following code snippet: HashMap<Integer, Car> carsHashMap=new HashMap<>(); Car car1=new Car("Car1", 20000); Car car2=new Car("Car2", 50000); Car[] carsArray=new Car[2]; carsArray[0]=car1; carsArray[1]=car2; int key=5; for(int i=0;i<carsArray.length;i++) { carsHashMap.put(i*key+2, carsArray[i]); } How many objects will be put inside the carsHashMap? a. Seven objects (5 of them are null) b. None of these c. Five objects (3 of them are null) d. Two objects only
What does the below code do? public class Node<T> { private T data; private Node<T> node; public Node(T data) { this.data = data; } public Node<T> getNode() { return node; } public void setNode(Node<T> node) { this.node = node; } public T getData() { return data; } public void setData(T data) { this.data = data; } @Override public String toString() { return data+" "; } @Override public int hCode() { final int pm = 31; int res = 1; res = pm * res + ((data == null) ? 0 : data.hCode()); res = pm * res + ((node == null) ? 0 : node.hCode()); return res; } @Override public boolean equals(Object obj) { if(this == obj) return true; if(obj == null) return false; if(!(obj instanceof Node)) return false; Node other = (Node) obj; if(data == null) { if(other.data != null) return false; } else if(!data .equals(other.data)) return false; if(node == null) { if(other.node != null) return…
Java Code: Build the two variable classes that we need: InterpreterDataType and a subclass InterpreterArrayDataType. I will abbreviate these as IDT and IADT. IDT holds a string and has two constructors - one with and one without an initial value supplied. IADT holds a HashMap<String,IDT>. Its constructor should create that hash map. We will use these as our variable storage classes as the interpreter runs. Let's start the interpreter itself. Create a new class (Interpreter). Inside of it, we will have an inner class - LineManager. We will also need a HashMap<String,IDT> that will hold our global variables. We will also have a member HashMap<String, FunctionDefinitionNode> - this will be our source when someone calls a function. The LineManager should take a List<String> as a parameter to the constructor and store it in a member. This will be our read-in input file. It will need a method : SplitAndAssign. This method will get the next line and split it by looking…
Each of the iterators must implement the java.util.Iterator interface by providing the two public methods hasNext () and next(). The Iterator interface also lists two additional methods, remove () and forEachRemaining (). These are marked as default, so the interface itself does not require implementation. Of these methods, this assignment only requires you to implement the remove () method of the linked list iterator. 1 ArrayList iterator This is an external iterator, meaning it is a public class named ICS211ArrayListIterator, and and the code is not part of the ArrayList class. Your ICS211ArrayListIterator class should have a constructor ICS211ArrayListIterator(java.util.ArrayList gives access to all the elements of the array list. This array must be saved as the value of a class variable of the iterator. data). The constructor must call one of the two toArray methods of ArrayList to obtain an array that Other than this single call to java.util.ArrayList.toArray in the constructor,…
[JAVA] Please provide comments to my code import java.util.HashMap;public class Items {private final HashMap<String, Integer> allWeapons = setHash("weapon");private final HashMap<String, Integer> allArmor = setHash("armor");private final HashMap<String, Integer> allConsumables = setHash("consumable");public String type;public String name;public int modifier;public Items(String type) {randomItem(type);}public Items(String type, String name) {switch (type) {case "weapon":if (allWeapons.containsKey(name)) {this.type = "weapon";this.name = name;this.modifier = allWeapons.get(name);} else {randomItem(type);}break;case "armor":if (allArmor.containsKey(name)) {this.type = "armor";this.name = name;this.modifier = allArmor.get(name);} else {randomItem(type);}break;case "consumable":if (allConsumables.containsKey(name)) {this.type = "consumable";this.name = name;this.modifier = allConsumables.get(name);} else {randomItem(type);}break;default:randomItem(type);break;}}private…
Attach screenshot as need to creating a oddIterator method that returns elements at odd indices. I it.
Hashcode may implement from the Algorithm Robert Sedgwick book.
7- question What keys and values are contained in the following map after execution of the following piece of code? Map map = new HashMap (); map.put (8, "Eight"); map.put (41, "Forty-one"); map.put (8, "Ocho"); map.put (18, "Eighteen"); map.put (50, "Fifty"); map.put (132, "OneThreeTwo"); map.put (28, "Twenty-eight"); map.put (79, "Seventy-nine"); map.remove ( 41); map.remove (28); map.put (28, "18"); map.remove (18); a. {8=Eight, 41=Forty-one, 8=0cho, 18=Eighteen, 50=Fifty, 132=OneThreeTwo, 28=Twenty-eight, 79=Seventy-nine, 28=18} b. {8=Eight, 8=Ocho, 50=Fifty, 132=OneThreeTwo, 79=Seventy-nine, 28=18} c. {50=Fifty, 132=DOneThreeTwo, 8=Ocho, 28=18, 79=Seventy-nine} d. {8=Eight, 50=Fifty, 132=OneThreeTwo, 79=Seventy-nine, 28=18}
To finish up the definition of the Node class, we need at least two constructor methods. We definitely want a default constructor that creates an emptyNode, with both the Element and Link members set to null. We also need aparameterized constructor that assigns data to the Element member and setsthe Link member to null.Write the code for the Node class:
Please help me in java programming language to convert numbers to words from 0 - 999,999,999. Below is my code. please hel me to solve this problem. Thank you.
Can someone help me with this code, I not really understanding how to do this? import java.util.ArrayList;import java.util.HashMap;import java.util.Map;/*** @version Spring 2019* @author Kyle*/public class MapProblems {/*** Modify and return the given map as follows: if the key "a" has a value, set the key "b" to* have that value, and set the key "a" to have the value "". Basically "b" is confiscating the* value and replacing it with the empty string.** @param map to be edited* @return map*/public Map<String, String> confiscate(Map<String, String> map) {if (map.containsKey("a") && map.containsValue("a")) {}}/*** Modify and return the given map as follows: if the key "duck" has a value, set the key* "goose" to have that same value. In all cases remove the key "swan", the rest of the map* should not change.** @param map to be edited* @return map*/public Map<String, String> mapBird1(Map<String, String> map) {throw new UnsupportedOperationException("Not…
Multiple choice in java Given the following code snippet: ArrayList<Student> students=fp.readNamesAndCreateObjects("D:\\AAUJ\\AAA\\StudentNames.txt", "student"); HashMap<Integer, Student> studentsHashMap=fp.copyFromArrayListToHashMap(students); for(HashMap.Entry<Integer,Student> entries :studentsHashMap.entrySet()) { System.out.println("Key = " + entries.getKey() + " , Value = " + entries.getValue()); } Which of the following reflects a valid definition (signature and behavior) for the copyFromArrayListToHashMap a. default Student copyFromArrayListToHashMap(ArrayList<E> objects) { HashMap<Integer,E> result=new HashMap<>(); for(int i=0;i<objects.size();i++) { result.put(i, objects.get(i)); } return result; } b. default HashMap<T,E> copyFromArrayListToHashMap(ArrayList<E> objects) { HashMap<Integer,E>…