Question

please look at below code and respond all the required

import Foundation

protocol TaksPerformer {

func doAThing()

}

class Employee: TaksPerformer {

let name: String

var boss: Boss?

init(name: String) {

self.name = name

}

func doAThing() {

print("\(name) is doing a thing")

}

}

class Boss {

var employee: Employee

let name: String

init(name: String, employee: Employee) {

self.name = name

self.employee = employee

employee.boss = self

}

func actLikeABoss() {

employee.doAThing()

}

}

// 1)

// A) What is wrong with the current implementation of Boss and Employee, why is it wrong, and how can we demonstrate that there is an issue?

//

// B) What pattern discussed in class does the Boss - Employee relationship remind you of? Give an example of the discussed pattern.

//

// C) Create a Person class that has the following property:

// let name: String

// Now have Employee and Boss inherit from Person

//

// D) You realize that there are speciffic tasks you would like an employee to perform. All tasks look like this:

// func makeCoffe(_ name: String) {

// print("\(name) made coffe")

// }

//

// func writeReport(_ name: String) {

// print("\(name) wrote a report")

// }

// Modify Boss, Employee and TaskPerformer in a way that a Boss can be instantiated with the following constructor:

// Boss(name: "Bossman", employee: anEmployee, tasks: [makeCoffe, writeReport])

// The employee instance should perform the tasks.

// 2)

// Create a small app that takes user input and performs a useful calculation with that user input

// - Using techniques we learned in class, make sure that absolutely no input crashes the app.

// - Use layout constraints to make sure the app looks good in portraint and landscape mode, as well as on small and large devices.

// - Use MVC

// - Bonus: Write unit tests for your model to make sure no input can crash the app.

// 3) You created a bookshelf.

// A) How could you modify Shelve with a technique discussed in class so that you can create Shelve instances that contain

// Tools, Dishes or any other kind of object?

// B) Create a function that takes in two shelves of the same type and swaps their items

struct Book {

let title: String

}

struct Shelve {

var top: Book

var center: Book

var bottom: Book

}

Answer 1

1.
A)Without inheriting Employee class, Boss class trying to assign employee details to local variable.

B)

package relationsdemo;

public class Bike

{

    private String color;

    private int maxSpeed;

    public void bikeInfo()

    {

        System.out.println("Bike Color= "+color + " Max Speed= " + maxSpeed);

    }

    public void setColor(String color)

    {

        this.color = color;

    }

    public void setMaxSpeed(int maxSpeed)

    {

        this.maxSpeed = maxSpeed;

    }

}

In the code above the Bike class has a few instance variables and methods.

package relationsdemo;

public class Pulsar extends Bike

{

    public void PulsarStartDemo()

    {

        Engine PulsarEngine = new Engine();

       PulsarEngine.stop();

    }

}

Pulsar is a type of bike that extends the Bike class that shows that Pulsar is a Bike. Pulsar also uses an Engine's method, stop, using composition. So it shows that a Pulsar has an Engine


C)

class Person
{
String name;
   Person(String name)
   {
   this.name=name;
   }
}

class Employee
{
   void showName()
   {
       System.out.println(name);
   }
}

class Boss extends Person
{
   void showName()
   {
       System.out.println(name);
   }
}
class ans
{
   public static void main(String args[])
   {
       Boss b=new Boss("Shri");
       Employee e=new Employee("Watto");
       b.showName();
       e.showName();
   }
}

D)

class Person
{
String name;
   Person(String name)
   {
   this.name=name;
   }
}

class Boss extends Person
{
   void showName()
   {
       System.out.println(name);
   }
}

class Employee extends Boss
{
   void makeCoffee()
   {
       System.out.println("Coffee");
   }
   void writeReport()
   {
       System.out.println("Report done");
   }
}

class ans
{
   public static void main(String args[])
   {
       Employee e=new Employee("Bossman");
       e.showName();
       e.makeCoffee();
       e.writeReport();
   }
}

2)

mport java.util.Scanner;

public class JavaExample {

public static void main(String[] args) {

   double num1, num2;
Scanner scanner = new Scanner(System.in);
System.out.print("Enter first number:");

num1 = scanner.nextDouble();
System.out.print("Enter second number:");
num2 = scanner.nextDouble();

System.out.print("Enter an operator (+, -, *, /): ");
char operator = scanner.next().charAt(0);

scanner.close();
double output;

switch(operator)
{
case '+':
   output = num1 + num2;
break;

case '-':
   output = num1 - num2;
break;

case '*':
   output = num1 * num2;
break;

case '/':
   output = num1 / num2;
break;

default:
System.out.printf("You have entered wrong operator");
return;
}

System.out.println(num1+" "+operator+" "+num2+": "+output);
}
}