Why the first line of command is NOT recommended, and the second line of command is recommended while trying to obtain the object an Engine class? getInstance(String algorithm, String Provider); // not recommended getInstance(String algorithm); // recommended Write a java code fragment to generate secret key
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Answer the following:
- Why the first line of command is NOT recommended, and the second line of command is recommended while trying to obtain the object an Engine class?
getInstance(String
getInstance(String algorithm); // recommended
- Write a java code fragment to generate secret key
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- PS: Please answer number 1 and 2 as they are related everything altogether. Make sure the code delivers expected successful output. 1. Create a Java class named Package that contains the following:a. Package should have three private instance variables of type double named length, width, andheight.b. Package should have one private instance variable of the type Scanner named input, initializedto System.in.c. No-args (explicit default) public constructor, which initializes all three double instance variables to1.0.d. Initial (parameterized) public constructor, which defines three parameters of type double,named length, width, and height, which are used to initialize the instance variables of same name.e. Public copy constructor, with a parameter of type Package, used to duplicate anexisting Package object.f. Three public void methods named inputLength, inputWidth, and inputHeight. Each methodwill prompt the user for the appropriate property, and input a double value usingthe Scanner…Which of the following is a symptom of Shotgun Surgery bad smell? 1. Whenever make a change, you have to make a lot of little changes to a lot of different classes. 2. When one module changed in different ways for different reasons 3. When a method is making more use of another class than the one it is in 4. When you have sets of variables that are usually passed together in multiple places Pair programming is responsible of introducing bad smells in the code True FalsePlease teach me how to fix an error from my JAVA source code. I have set up the source code with class name "ProductionWorker" and there were a error occured on second page of sceenshot where it is highlighted. //import the file import java.util.*; //create the class class Employee { //create the variable private String emp_num; //create the date variable private Date hiring_date; // default constructor public Employee() { //assign the emp num. this.emp_num = "000-A"; //assign the Date this.hiring_date = new Date(); } // constructor parameter public Employee(String emp_num, Date hiring_date) { this.emp_num = emp_num; this.hiring_date = hiring_date; } // getter method public String getEmployeeNumber() { return this.emp_num; } // call the gethiringdate function public Date gethiringDate() { // return the date return this.hiring_date; } // setter method public void setEmployeeNumber(String emp_num) { //set the emp num. this.emp_num = emp_num; } //set the hiring date public void…
- 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…I need help with creating a Java program described in the image below: CourseInformation.java: import java.util.Scanner; public class CourseInformation { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); Course myCourse = new Course(); OfferedCourse myOfferedCourse = new OfferedCourse(); String courseNumber, courseTitle; String oCourseNumber, oCourseTitle, instructorName, location, classTime; courseNumber = scnr.nextLine(); courseTitle = scnr.nextLine(); oCourseNumber = scnr.nextLine(); oCourseTitle = scnr.nextLine(); instructorName = scnr.nextLine(); location = scnr.nextLine(); classTime = scnr.nextLine(); myCourse.setCourseNumber(courseNumber); myCourse.setCourseTitle(courseTitle); myCourse.printInfo(); myOfferedCourse.setCourseNumber(oCourseNumber); myOfferedCourse.setCourseTitle(oCourseTitle); myOfferedCourse.setInstructorName(instructorName);…Create 1 Java Class for each shape below without main method with the specifications given below.There should be a constructor for each shape’s Java class to set the instance variables value which is passed as argument to the constructor coming from user input. Object: CircleStates: radiusBehaviors: computeArea() - returns the area of a circle computeCircumference() Object: RectangleStates: length, widthBehaviors: computeArea() - returns the area of a rectangle computePerimeter()
- Can you help debug my Java program? Attached is a screenshot of my code. Here are my bugs: i cannot be resolved to a variable (line 27)i cannot be resolved to a variable (line 28)n cannot be resolved to a variable (line 27)Scan cannot be resolved (line 15, 19)Syntax error, insert ; to complete statement (line 19)Syntax error, insert “.class” (line 28)The left hand side of an assignment must be a variable (line 27)The method char(at)int is undefined (line 19)This method requires a body (line 24)Void methods cannot return a value (line 31)First, launch NetBeans and close any previous projects that may be open (at the top menu go to File ==> Close All Projects).Then create a new Java application called "BackwardsStrings" (without the quotation marks) that:Prompts the user at the command line for one 3-character string.Then (after the user inputs that first 3-character string) prompts the user for another 3-character string.Then prints out the two input strings with a space between them.Finally prints on a separate line the two input strings 'in reverse' (see example below) with a space between them.Create a new Java project/class called Equality. Ask the user if they have a job. If they entered yes, print: “You are the breadwinner!” If no, print: “Keep searching, you will find one!”
- Consider an online holiday booking system. The users can register to book a holiday package. After the users have been registered, their credentials will be checked by the class, Verification. Which of the following Gang of Four (GoF) design patterns should be applied to restrict the instantiation of the Verification class to one object? Select one: a. Factory method b. Singleton c. Decorator d. AdapterGiven the following class, what sets of statements would have the end result of the myUser instance having the username as testuser and the password as testpassword and then outputting the username and password? public class User { private String userName; private String password; public User(String userName, String password) { this.userName = userName; this.password = password; } public String getUserName() { return userName; } public String getPassword() { return password; } public void setUserName(String userName) { this.userName = userName; } public void setPassword(String password) { this.password = password; } } 1- User myUser = new User("testuser","testpassword"); System.out.println("User: " + myUser.username); System.out.println("Password: " + myUser.password); 2- User myUser = new User("testuser","testpassword"); System.out.println("User: " + myUser.username()); System.out.println("Password: " + myUser.password());…What is a static variable? Group of answer choices 1. None of the options are correct. 2. A variable that is common among all instances of the class, and can be accessed without any instantiation of the class. 3. Variables cannot be static, only methods can. 4. A variable whose value remains fixed after creation, and cannot change. 5. A variable that gets destroyed when the instance of the class is no longer used.