OO questions: a.Draw the class diagram for car with: -Attributes: name of class, license plate number, make, model, year -Methods: start(), speedup(), slowdown(), stop().   (consider parameters) Write statements in (Java) that create an instance of the car class for: Start the car, speed up a few times, slow down, and stop (consider initial speed =0) Give the program

The following code is in Java,find the error in the following class definition: public class FindTheError {    public int square(int number)    {       return number * number;    }    public double square(int number)    {       return number * number;    }   1) What is the problem? 2)How would you fix it?

(Java) DO PART 2! PART 2 IS BASED OFF PART 1!!! PART 1: Open up a new Java project called Activity6 and create a class called Person Inside of the class, define three attributes that a person has as variables of the class Name Age Gender Next, define two actions that can be performed as methods of the class: The method is named greeting It takes no parameters It prints out the message "Hi, my name is " + name + "!" It returns nothing The method is named addYear It takes in no parameters It adds one year to the person's age It returns nothing Then, create a new Java file called PersonTest.java. Copy and paste the below test code into PersonTest.java: /*** @author* CIS 36B, Activity 6.1*/public class PersonTest {    public static void main(String[] args) {        Person wen = new Person();        wen.name = "Wen";        wen.age = 19;        wen.gender = "male";        wen.greeting();        wen.addYear();        System.out.println("I just turned " + wen.age + " years…

(Intro to Java) Open up Eclipse and create a new Java class called Salary.java. Copy and paste the starter code below into the file. NOTE: Do not change the starter code! All you need to do is add to it. import java.util.Scanner; public class Salary {   //Write your methods here   public static void main(String[] args) { Scanner input = new Scanner(System.in);int hours;double hourly_wage;double weekly_salary = 0;double monthly_salary = 0;double yearly_salary = 0;System.out.println("This program will calculate your weekly, monthly "+ "and yearly salary!");System.out.print("Please enter your hourly wage: ");hourly_wage = input.nextDouble();System.out.print("Please enter the number of hours you work each week: ");hours = input.nextInt();//call methods belowweekly_salary = //method call goes heremonthly_salary = //method call goes hereyearly_salary = //method call goes hereSystem.out.printf("You make $%.2f per week\n", weekly_salary);System.out.printf("You make $%.2f per month\n",…