Which of the following can be used to replace YYYYYYYY in the following code? public class WildCardDemo{ public static void main(String[] args) { GenericStack stack1 = new GenericStack<>(); GenericStack stack2 = new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2); } public static void add(GenericStack stack1,GenericStack stack2) { while (!stack1.isEmpty()) stack2.push(stack1.pop()); } Select one: O a. ? extends Object b. ? extends T c. ? super T

Which of the following can be used to replace YYYYYYYY in the following code? public class WildCardDemo{ public static void main(String[] args) { GenericStack stack1 = new GenericStack<>(); GenericStack stack2 = new GenericStack<>(); stack2.push("Java"); stack2.push(2); stack1.push("Sun"); add(stack1, stack2); } public static void add(GenericStack stack1,GenericStack stack2) { while (!stack1.isEmpty()) stack2.push(stack1.pop()); } Select one: O a. ? extends Object b. ? extends T c. ? super T

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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public interface StackInterface void push (T element) throws StackoverfloWException; void pop () throws StackUnderflowException; T top () throws StackUnderflowException; boolean isFul1 (); boolean isEmpty(); Show what is written by the following segments of code (see printın on the code), given that iteml, item2, and item3 are int variables, and ali is an object that fits the abstract description of a stack as shown above StackInterface. Assume that you can store and retrieve variables of type int on ali. iteml = 2; item2 = 0; item3 = 6; ali.push (item2); ali.push (item1); ali.push ( iteml+item3); item2 = ali.top ( ); ali.push (item3*item3); ali.push (item2); ali.push (3); iteml = ali.top ( ); ali.pop( ); System.out.println (iteml + " " + item2 + while (!ali.isEmpty( )) + item3); iteml = ali.top( ) ; ali.pop () ; System.out.println (item1) ;
import java.util.ArrayList; public class Bus { privateStringname; privateintsize; privateintbasePrice; privateArrayList<Trip>approvedTrips; privateintlevel;// 1,2,3 for low,medium, high repectively; privateintid; privatestaticintnextId=0; privateMinistrymny; protectedStringtripTypes; privateintgetNextId(){ returnnextId++; } publicBus(){ approvedTrips=newArrayList<Trip>(); } publicBus(Stringname,intsize,intbasePrice,intlev,Ministrymny){ approvedTrips=newArrayList<Trip>(); this.name=name; this.size=size; this.basePrice=basePrice; this.level=lev; this.id=getNextId(); this.mny=mny; tripTypes="BASICTRANSPORT"; } publicbooleanavailable(Datedate){ booleanretval=true; for(Tript:approvedTrips) if(t.getDate().getDay()==date.getDay()) retval=false; returnretval; } publicintgetBasePrice(){ returnbasePrice; } publicintgetId(){ returnid; } publicStringgetName(){ returnname; } publicdoublegetSize(){ returnsize; } publicStringtoString(){ returnname; }…
2. By using the above class definition, write a program statement for each of the operation: // Import the LinkedList class import java.util.LinkedList; public class linkedListl { public static void main(String[] args) { LinkedList cars = new LinkedList (); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"); cars.add("Mazda"); } } a) Use removeFirst () remove the first item from the list b) Use removeLast () remove the last item from the list c) Use getFirst () to display the first item in the list d) Use getLast () to display the last item in the list
In Java import java.util.Scanner; public class ShoppingList { public static void main (String[] args) { Scanner scnr = new Scanner(System.in); ItemNode headNode; // Create intNode objects ItemNode currNode; ItemNode lastNode; String item; int i; // Front of nodes list headNode = new ItemNode(); lastNode = headNode; int input = scnr.nextInt(); for(i = 0; i < input; i++ ){ item = scnr.next(); currNode = new ItemNode(item); lastNode.insertAtEnd(headNode, currNode); lastNode = currNode; } // Print linked list currNode = headNode.getNext(); while (currNode != null) { currNode.printNodeData(); currNode = currNode.getNext(); } } } ----------------------------------------- public class ItemNode { private String item; private ItemNode nextNodeRef; // Reference to the next node public ItemNode() { item = ""; nextNodeRef = null; } // Constructor public ItemNode(String itemInit) { this.item = itemInit; this.nextNodeRef = null; } // Constructor public…
import java.util.Scanner; public class ShoppingList { public static void main (String[] args) { Scanner scnr = new Scanner(System.in); ItemNode headNode; // Create intNode objects ItemNode currNode; ItemNode lastNode; String item; int i; // Front of nodes list headNode = new ItemNode(); lastNode = headNode; int input = scnr.nextInt(); for(i = 0; i < input; i++ ){ item = scnr.next(); currNode = new ItemNode(item); lastNode.insertAtEnd(headNode, currNode); lastNode = currNode; } // Print linked list currNode = headNode.getNext(); while (currNode != null) { currNode.printNodeData(); currNode = currNode.getNext(); } }}
public class CustomLinkedList { public static int findMax(IntNode headObj) { /* Type your code here */ } public static void main(String[] args) { IntNode headObj; IntNode currObj; IntNode lastObj; int i; int max; // Create head node headObj = new IntNode(-1); lastObj = headObj; // Add nodes to the list for (i = 0; i < 20; ++i) { currObj = new IntNode(i); lastObj.insertAfter(currObj); lastObj = currObj; } max = findMax(headObj); System.out.println(max); }}
public class ShoppingListDriver{ public static void main(String[] args){ ShoppingList sl=new ShoppingList(3);sl.insert(null);sl.insert(new Item("Bread", "Carb Food", 2, 2.99));sl.insert(new Item("Seafood","Sea Food", -1, 10.99));sl.insert(new Item("Rice", "Carb Food",2, 19.99));sl.insert(new Item("Salad Dressings","Dessing", 2, 19.99));sl.insert(new Item("Eggs", "Protein",2, 3.99));sl.insert(new Item("Cheese","Protein", 2, 1.59));sl.insert(new Item("Eggs", "Protein",3, 3.99));sl.printNames();sl.print(); System.out.println("After removing Eggs:");sl.remove(new Item("Eggs","Protein",0,0));sl.printNames();sl.print(); }}
API documentation link ------> https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html PREVIOUS CODE - import java.util.ArrayList;public class BasicArrayList { // main method public static void main(String[] args) { // create an arraylist of type Integer ArrayList<Integer> basic = new ArrayList<Integer>(); // using loop add elements for(int i=0;i<4;i++){ basic.add(i+1); } // using loop set elements for(int i=0;i<basic.size();i++){ basic.set(i,(basic.get(i)*5)); } // using loop print elements for(int i=0;i<basic.size();i++){ System.out.println(basic.get(i)); } }} Q1) a)Consider how to remove elements from the ArrayList. Give two different lines of code that would both remove 5 from the ArrayList. b)What do you think the contents of the ArrayList will look like after the 5 has been removed? (Sketch or list) c)Now update the BasicArrayList program to remove the 5 (index 1) from the ArrayList. Add this step before the last loop that…
class WaterSort { Character top = null; // create constants for colors static Character red= new Character('r'); static Character blue = new Character('b'); static Character yellow= new Character('g'); // Bottles declaration public static void showAll( StackAsMyArrayList bottles[]) { for (int i = 0; i<=4; i++) { System.out.println("Bottle "+ i+ ": " + bottles[i]); } } public static void main(String args[]) { //part 1 //create the bottle StackAsMyArrayList bottleONE = new StackAsMyArrayList<Character>(); System.out.println("\nbottleONE:"+ bottleONE+ " size:" + bottleONE.getStackSize()+" uniform? "+ bottleONE.checkStackUniform());…
how to create an interface in java that contains the following methods: boolean myPush(T element); // pushes element onto the stack; returns true if element successfully pushed, false otherwise boolean myPop(); // removes the top element of the stack; returns true if element successfully popped, false otherwise T myTop(); // if the stack is not empty returns the top element of the stack, otherwise returns null String toString();  // returns contents of the stack as a single String int size();  // return number of elements in the stack then create java file that Implements your interface that you created as a linked stack, then use the driver shown in screen shot to test. below is the code for the LLNode class public class LLNode<T> { protected LLNode<T> link; protected T info; public LLNode(T info) { this.info = info; link = null; } public void setInfo(T info) { this.info = info; } public T getInfo() { return info; } public void setLink(LLNode<T> link) {…
import java.util.Scanner; public class Playlist {    // TODO: Write method to ouptut list of songs    public static void main (String[] args) { Scanner scnr = new Scanner(System.in);    SongNode headNode;    SongNode currNode; SongNode lastNode; String songTitle; int songLength; String songArtist; // Front of nodes list     headNode = new SongNode(); lastNode = headNode; // Read user input until -1 entered songTitle = scnr.nextLine(); while (!songTitle.equals("-1")) { songLength = scnr.nextInt(); scnr.nextLine(); songArtist = scnr.nextLine();    currNode = new SongNode(songTitle, songLength, songArtist); lastNode.insertAfter(currNode); lastNode = currNode;    songTitle = scnr.nextLine(); }     // Print linked list…
Starter code for ShoppingList.java import java.util.*;import java.util.LinkedList; public class ShoppingList{ public static void main(String[] args) { Scanner scnr=new Scanner(System.in); LinkedList<ListItem>shoppingList=new LinkedList<ListItem>();//declare LinkedList String item; int i=0,n=0;//declare variables item=scnr.nextLine();//get input from user while(item.equals("-1")!=true)//get inputuntil user not enter -1 { shoppingList.add(new ListItem(item));//add into shoppingList LinkedList n++;//increment n item=scnr.nextLine();//get item from user } for(i=0;i<n;i++) { shoppingList.get(i).printNodeData();//call printNodeData()for each object } }} class ListItem{ String item;     //constructor ListItem(String item) { this.item=item; }     void printNodeData() { System.out.println(item); }}