Question

in java

Create a class called Customer in three steps: • (Step-1): • Add a constructor of the class Customer that takes the name and purchase amount of the customer as inputs. • Write getter methods getName and getPrice to return the name and price of the customer. You can write a toString() method which returns printed string of Customer name and its purchase. • (Step-2): Create a class called Restaurant. • Write a method addsale that takes customer name and purchase amount of the customer in the class restaurant and stores it into an array list. • Write a method nameBestCustomer that returns customer name who bought highest sale in the restaurant. • (Step-3): Write a tester class that prompts the user to enter name and purchase of the customers and display the name of the customer who bought highest sales in the restaurant.

Answer 1

/*
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/**
 *
 * @author User
 */
import java.util.*;
class customer{
    private String name;
    private int purchaseAmt;
            Scanner sc=new Scanner(System.in);


    public customer() {
        System.out.println("\nEnter the Name and purchase amount: \n");
         this.name=sc.nextLine();
         this.purchaseAmt=sc.nextInt();
    }
        public String getName() {
        return this.name;
    }
         public Integer getPurchaseAmt() {
        return this.purchaseAmt;
    }

         public String toString(){//overriding the toString() method  
  return "Name: "+this.getName()+"  Purchase Amount : "+this.getPurchaseAmt()+"\n";  
 }  
    
}


class Comp implements Comparator<customer>{
 
    @Override
    public int compare(customer e1, customer e2) {
        return e1.getPurchaseAmt().compareTo(e2.getPurchaseAmt());
    }
}


class Restaurant {
     ArrayList<customer> list = new ArrayList<>();
     int index;
    void addSale(int n){
        //ArrayList<customer> list = new ArrayList<>();
        for (int i=0;i<n;i++)
            list.add( new customer() );
        
        System.out.println(list);
        
        
        highestSales();
    }


    void highestSales()
    {
        customer maxSal = Collections.max(list, new Comp());
        System.out.println("\n\nHighest sales :\n"+maxSal);
        
    }
    
}



public class tester  {

    /**
     * @param args the command line arguments
     */
    
    public static void main(String[] args) {
            Scanner sc=new Scanner(System.in);
        System.out.println("\nHow many customers\n");
         int n=sc.nextInt();
         Restaurant restObj=new Restaurant();
         restObj.addSale( n);
       
    }
    
}

Hope this helps..cheers!!