players.add(aPlayer); return this.playerName; this.playerName = playerName; private HashMap> teamRoster; public static void main(String args[]) { class BaseballTeam { return teamRoster.get(name); catch (NullPointerException e) { private int numHits; class Player { public BaseballTeam() { if(teamRoster.containskey(name)) { public String getPlayerName () { players = this.getPlayer(name); public void addPlayer(String name, Player aPlayer) { this.numRuns = numRuns; public LinkedList getPlayer(String name) throws NullPointerException { try { private int numRuns; teamRoster = new HashMap>(); throw new NullPointerException(); class Main { public Player(String playerName, int numHits, int numRuns) { private String playerName; import java.util.LinkedList; this.numHits = numHits; import java.util.HashMap; LinkedList players; teamRoster.put(name, players); players = new LinkedList(); BaseballTeam redsox = new BaseballTeam();

players.add(aPlayer); return this.playerName; this.playerName = playerName; private HashMap> teamRoster; public static void main(String args[]) { class BaseballTeam { return teamRoster.get(name); catch (NullPointerException e) { private int numHits; class Player { public BaseballTeam() { if(teamRoster.containskey(name)) { public String getPlayerName () { players = this.getPlayer(name); public void addPlayer(String name, Player aPlayer) { this.numRuns = numRuns; public LinkedList getPlayer(String name) throws NullPointerException { try { private int numRuns; teamRoster = new HashMap>(); throw new NullPointerException(); class Main { public Player(String playerName, int numHits, int numRuns) { private String playerName; import java.util.LinkedList; this.numHits = numHits; import java.util.HashMap; LinkedList players; teamRoster.put(name, players); players = new LinkedList(); BaseballTeam redsox = new BaseballTeam();

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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The following Java code is poorly structured. Rewrite it so that it has a better structure and avoids redundancy. To help eliminate redundancy, convert the code into a method named spending that accepts two parameters: a Scanner for the console, and a String for a single person's name, and prints the appropriate information about that person's bills. Your method could be called twice (once for John and once for Jane) to replicate the original code's behavior. public void spending(Scanner console,String name) { System.out.print("How much will " + name + " be spending?"); double amount = console.nextDouble(); System.out.println(); int numBills = (int) (amount / 20.0); if (numBills * 20.0 < amount) { numBills++; } System.out.println(name + " needs " + numBills + " bills"); } The code above is all I was given to work with, which is why I'm a bit confused and need help. Thank you.
use the file Dining.java which is provided below and Complete the calcTip() method as described in the comments. Then add a new method called splitBill() which receives as input an integer value, representing the number of diners, and returns each person's equal share of the bill.
write program in java Create a Java Project With Your name as “EemanAsadProjectQNo1”, add a class to this Project, Class name should be Your Name with Your Reg No as “YourName18-arid-2860” Add a Method to Accept names and marks of nstudents from user, enter the value of nfrom Userb. Ensure that valid data is entered. If user enters an invalid data, then appropriate message should be displayed using Message Dialog Box e.g. ‘Name cannot be a number’ or ‘Marks must be an integer value’ Add another Method, to Display this data in descending order according to marks such that name of student having maximum marks should come at the top and the name of student having minimum marks should come at the bottom.
Kindly do this in Java ProgrammingKindly show screen captures of your work.please dont respond to this in the event that you can't answer both since I posted a ton of times as of now (programmed pointless) 11. Compose a settled for circle explanation to print out the increase table for numbers 1, 2, .., 9. The result should seems to be: 1 x 1 = 1, 1 x 2 = 2, 1 x 3 = 3, 1 x 4 = 4, 1 x 5 = 5, 1 x 6 = 6, 1 x 7 = 7, 1 x 8 = 8, 1 x 9 = 9 2 x 2 = 4, 2 x 3 = 6, .................................................................................., 2 x 9 = 18 3 x 3 = 9, .................................................................................., 3 x 9 = 27 .................................................................................................... 9 x 9 = 81 (Answer: Use System.out.printf to get sections arrangement overall quite slick) 12. Compose a technique public static initializeArray(int [] arr) to instate a given int cluster named arr with irregular numbers somewhere in the…
Create a java class called Question4, and implement the following points inside the main method:1. Reads a string from the standard input device and store it in a variable called inputStr.2. Find all the letter characters in inputStr and store them in another string variable called letterChars. Then, convert all the characters in letterChars to uppercase characters (i.e., capital letters).3. Display the contents of letterChars to the user using a message dialog box.For example, if the contents of inputStr is “q123Ab455c6d”, then the final contents of letterChars will be “QABCD”.
Write a Java program that randomly generates a three-digit lottery number and prompts the user to enter a three-digit number. Each digit in the number is in the range between 0 to 9 with both 0 and 9 possible numbers. Write a method named getPrize() to determine which prize the user wins following the rules shown below. The method getPrize() should return an integer representing which prize was won such as 1 for first, 2 for second, etc. It should return -1 if no prize was won.
Write a java program which asks the user to enter name and age and calls the following methods: a. printName(): Takes name as parameter and prints it 20 times using a while loop. b. printAge(): Takes age as parameter and prints all the numbers from 1 up to age. Please strictly follow the format.shoen below Note: any extra or missing space / line will lead to test failure. (The output should look like exactly as the example shown below and with the commas included in the last line and all numbers in same line too. Use import so we can put our own names and numbers.) Name: Andy Age: 10 Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy Andy 1,2,3,4,5,6,7,8,9,10 class Main {public static void main(String[] args) {}}
Add a new Java class to your project by right clicking on the src folder in the Project pane and select New > Java Class.Enter Hours as the name for this class, and IntelliJ will add it to the files in the src folder for your project. Remember tocopy and insert the standard heading for the main method as you did for Program 2.Write a program that prompts the user to enter a number of hours, and produces the equivalent number of days as a wholenumber along with the number of hours left over. Assume that a day has exactly 24 hours. The following example showsthe format to use for your output, where the input entered by the user is underlined.Enter the number of hours: 100100 hours is 4 days, plus 4 hours.Define Variables: The number of hours will be a whole number, and we would like to obtain results as whole numbers ofdays and hours, so use the int data type to declare the variables to hold the numbers of hours input, as well as the results(the number of days and number of hours left…
In Java, the statement x++ is exactly equivalent to x = x + 1. But if x is a char, it's not exactly the same! In that case, x++ is legal, but x = x + 1 causes an error. write a java code with the error message what it is going to print. Write a java program to display a table of the integers from 0 to 10 along with their factorials. Create a Java program named StringTest.java and write a main method that contains expressions that combinevarious types using the + operator. For example, what happens when you add " a String and a char?(a)Does it perform character addition or string concatenation? (b)How can you determine the type of the result? A rational number is a number that can be represented as the ratio of two integers. For example, 2=3 is a rational number, and you can think of 7 as a rational number with an implicit 1 in the denominator.a)Define a class called Rational. A Rational object should have two integer instance variables that store the numerator and denominator.b)Write…
in Java Write a program that establishes two savings accounts with saver1 having account number10002 with an initial balance of $2,000, and saver2 having account 10003 with an initialbalance of $3,000. Set a common rate of interest at 5% per year. At the end of each month,update the balance by adding one month’s interest to the balance, so that the balancecompounds monthly. Print an output that displays the month number and the account numberand the balance for each of the two accounts. Use month 0 to display the initial balances, month1 to display the balances after the first month’s interest, and so on. At the end of the year,display the total balance for both accounts combined, like this:Output:Monthly balances for one year with 0.05 annual interest:Month Account # Balance Account # Balance----- --------- ------- --------- ------- 0 10002 2000.00 10003 3000.00 1 10002 2008.33 10003 3012.50 2 10002 2016.70 10003 3025.05 3 10002 2025.10 10003 3037.66 4 10002 2033.54 10003 3050.31 5…
I need help in Java code please. This is the question: Creating a JAVA program that should implement a method that verifies whether a given 4 x 4 square is a Magic Square with a given magicValue. Also, adding code to generate values for a Magic Square based on a magicValue. And below is the code. This code is run but it is just qualified the requirement which is to verify whether a given 4 x 4 square (containing 16 values) is a Magic Square with a given magic value. The other requirement is to generate values for a Magic Square based on a magicValue, when I check the executed magic square, the sum of the numbers in rows and columns is not equal to the magic value import java.util.*;import java.awt.*; public class MagicSquare{static int checkMag(int mat[][],int M) { // Function for checking Magic square int i, j,n=4; int sum=0; // filling matrix with its count value // starting from 1; for ( i = 0; i < n; i++) { for ( j = 0; j < n; j++) sum=sum+mat[i][j]; if(sum!=M) {return 0;}…
Someone please help me . Based on the java code given, how can i improve the error (photo1) and add a simple reservation and payment system in the program.. import java.util.Scanner;public class Juice_ordering { public static void main(String [] args){ Food[] foodArray = new Food[4]; foodArray[0] = new Juice("Apple","C01",5.00, "Which is very popular juice in our shop.","Apple",1);foodArray[1] = new Juice("Orange","I02",8.00, "Which is very popular juice in our shop.","Orange",2); foodArray[2] = new Snack("Cheez-It","SC001",15.00, "Which is very popular juice in shop.","tin","small");foodArray[3] = new Snack("Cheez-It","SC002",18.00, "Nice snack.","tin","medium"); boolean loopagain = true; while(loopagain){ System.out.println("1.\t Display Food");System.out.println("2.\t Order Food");System.out.println("3.\t Add Food");System.out.println("4.\t Delete Food");System.out.println("0.\t To Exit"); double total=0; Scanner in = new Scanner(System.in);System.out.println("Please enter…