in java, Explain or provide an example showing how a NullPointerException could arise.
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in java, Explain or provide an example showing how a NullPointerException could arise.
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- Using an example, discuss the main concepts of 0OPS in Java.the following code is centered around data collection, filtering, and using the Singleton pattern in Java, which is all part of a mockup "student information management system", with its purpose being making mockup new student accounts. I've been having issues using the software “dbeaver” for making java projects. Please organize the below code into an executable project “simulation.student” and given step by step instruction as to how this was done Address.java public class Address {private String _city;private String _state;private String _streetName; // Newprivate int _streetNumber; // Newprivate int _apartmentNumber; // New public Address(String city, String state, int zip, String streetName, int streetNumber, int apartmentNumber) {setCity(city);setState(state);setZip(zip);setStreetName(streetName);setStreetNumber(streetNumber);setApartmentNumber(apartmentNumber);} public String getCity() {return _city;} public void setCity(String city) {_city = city;} public String getState()…import java.util.Scanner; public class TowerOfHanoi { /** * Main class */ public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter number of disk: "); int noOfDisks = scanner.nextInt(); System.out.println("Choose 3 rods roles(A, B, C) as (Initial, Final, Buffer): "); System.out.print("\tInitial Rod: "); char initialRod = scanner.next().charAt(0); System.out.print("\tFinal Rod: "); char finalRod = scanner.next().charAt(0); System.out.print("\tBuffer Rod: "); char bufferRod = scanner.next().charAt(0); towerOfHanoi(noOfDisks, initialRod, finalRod, bufferRod); } /** * * Recursion function */ static void towerOfHanoi(int noOfDisks, char initialRod, char finalRod, char bufferRod) { if (noOfDisks == 1) {…
- 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 } } double // format and display output Number Format number = Number Format.getNumber Instance(); number.setMinimumFractionDigits (3); String message = "Area: " + number.format (area) + "\n" + " + number. format (perimeter) + "\n"; "Perimeter: System.out.println (message); // see if the user wants to continue (y/n): "); System.out.print("Continue? choice = sc.nextLine(); System.out.println(); System.out.println("Bye!");Solve the following exercise: 1. Use the following Java code to answer the following:to. Correct the errors that it hasb. Add required statements, routines, or modulesc. Explain the logic of the program and how it works // Demonstration of the JTextField class.import java.awt. *;import java.awt.event. *;import javax.swing. *;public class TestTextField extends JFrame{ private JTextField textfield1, textfield2, textfield3; private JPasswordField password field; // configure GUI public TestTextField (){ super ("Text Entry Test and Password Sample"); Container container = getContentPane (); container.setLayout (new FlowLayout ()); // create text field with default size textfield1 = new JTextField (10); container.add (textfield1); // create text field with default text TextField2 = new JTextField (" "); container.add (textfield2); // create text field with default text, // 20 visible elements and no event handler…Java Program ASAP Modify this program so it passes the test cases in Hypergrade becauses it says 5 out of 7 passed. Also I need one one program and please correct and change the program so that the numbers are in the correct places as shown in the correct test case. import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException;import java.util.ArrayList;import java.util.Arrays;import java.util.InputMismatchException;import java.util.Scanner;public class FileSorting { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (true) { System.out.println("Please enter the file name or type QUIT to exit:"); String fileName = scanner.nextLine(); if (fileName.equalsIgnoreCase("QUIT")) { break; } try { ArrayList<String> lines = readFile(fileName); if (lines.isEmpty()) { System.out.println("File " +…
- How to use StdRandom.uniform() in java?Java provides a mechanism that enables a program to be executed from the command line, as an application. Java runtime execution works on the basis that the class executed must have a: (constructor? inner class? method?) named `main’ that is: (final? static? local?) , public and void. This should take an : (StringBuffer? ArrayList? Array?) of Strings as its only argument. Execution is begun by (calling this method? clicking the BlueJ Run button? selecting this method from the dropdown menu?) . Select the correct answer.in java
- Please answer question. This is pertaining to Java programming language 2-13Given string inputStr on one line and integers idx1 and idx2 on a second line, output "Match found" if the character at index idx1 of inputStr is equal to the character at index idx2. Otherwise, output "Match not found". End with a newline. Ex: If the input is: eerie 4 1 then the output is: Match found Note: Assume the length of string inputStr is greater than or equal to both idx1 and idx2.import java.util.Scanner; public class CircleAndSphereWhileLoop{ public static final double MAX_RADIUS = 500.0; public static void main(String[] args) { Scanner in = new Scanner(System.in); // Step 2: Read a double value as radius using prompt // "Enter the radius (between 0.0 and 500.0, exclusive): " // Step 3: While the input radius is not in the ragne (0.0, 500.0) // Display a message on one line (ssuming input value -1) // "The input number -1.00 is out of range." // Read a double value as radius using the same promt double circumference = 2 * Math.PI * radius; double area = Math.PI * radius * radius; double surfaceArea = 4 * Math.PI * Math.pow(radius, 2); double volume = (4 / 3.0) * Math.PI * Math.pow(radius, 3); // Step 4: Display the radius, circle circumference, circle area, // sphere surface area, and…