Question

JAVA - Complete the directions in the 5 numbered comments

import java.util.Scanner;


/**
 * This program will use the HouseListing class and display a list of
 * houses sorted by the house's listing number
 * 
 * Complete the code below the numbered comments, 1 - 4. DO NOT CHANGE the
 * pre-written code
 * @author 
 *
 */

public class HouseListingDemo {

    public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
        HouseListing[] list;
        String listNumber, listDesc;
        int count = 0;
        double listPrice;
        String output;
        
        double mostExpensive;
        
         do{
            System.out.print("Enter the number of houses --> ");
           count = scan.nextInt();
        }while(count < 1);
         
        /* 1.
         * create an array of HouseListing objects using the variable that holds
         * the user's response to the prompt above
         */
        
        
        // for loop loads the array with HouseListing's constructor
        for (int i = 0; i < list.length; i++) 
        {
           System.out.println("\n***HOUSE " + (i+1) + "***");
           // Prompt for house listing #
           System.out.print("Enter house listing " +
                   "number (Alphanumeric) #"+ (i+1) +": ");
           listNumber = scan.next();
           
           // Clear buffer
           scan.nextLine();
           
           // Prompt for house description
           System.out.print("Enter description for " +
                   "house #" +(i+1) + ": ");
           listDesc = scan.nextLine();
           
           // Prompt for house price
           System.out.print("Enter listing price for " 
                   + "house #" +(i+1) + ": ");
           listPrice = scan.nextDouble();
           
            /* 2.
             * create a HouseListing object using the input values and store/load
             * the object in the array
             */
        }
        
        
        /* 3.
         * Assign the 0th element of the array to the most expensive house
           think ... you can't assign an object to a price but the object
           has a method that may help you here ... 
         */
        
        
        output = "Listings:\n";
        /*
         * loop below builds the output string
         */
        for (int i = 0; i < list.length; i++) {
            output += list[i] + "\n";
            
            /* 4.
              Using a control structure, find and the store the double varaible
              which holds the most expensive house (We don't need to listing #)
              JUST THE PRICE
            */
        }
        // output
         System.out.println(output);
        System.out.println("The most expensive house on the market costs: $" 
        + mostExpensive);
    }
}

Answer 1

CODE :

All the tasks are done .

NOTE:
Explanation is done in the comments for better visualisation we have modified the output +=list[i] + "\n"; as This only prints the object address not the contents because here list[i] is an array object to  invoke the object values to be able to see it. If you want to see the contents of the objects we have to use as done in the modified line only. If you just want to print the address then use as output +=list[i] + "\n"; otherwise go with the modified line as described in the comment section. Output is also attached please check it.

import java.util.Scanner;

/**
* This program will use the HouseListing class and display a list of
* houses sorted by the house's listing number
*
* Complete the code below the numbered comments, 1 - 4. DO NOT CHANGE the
* pre-written code
* @author
*
*/

class HouseListing{
String listNumber;
String listDesc;
double listPrice;
HouseListing(){
this.listNumber="";
this.listDesc="";
this.listPrice=0;
}
HouseListing(String listNumber,String listDesc,double listPrice){
this.listNumber=listNumber;
this.listDesc=listDesc;
this.listPrice=listPrice;
}
}

class Main extends HouseListing {
  
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
HouseListing[] list;
String listNumber, listDesc;
int count = 0;
double listPrice;
String output;
  
double mostExpensive;
  
do{
System.out.print("Enter the number of houses --> ");
count = scan.nextInt();
}while(count < 1);

/* 1.
* create an array of HouseListing objects using the variable that holds
* the user's response to the prompt above
*/
list = new HouseListing[count];
  
  
// for loop loads the array with HouseListing's constructor
for (int i = 0; i < list.length; i++)
{
System.out.println("\n***HOUSE " + (i+1) + "***");
// Prompt for house listing #
System.out.print("Enter house listing " +
"number (Alphanumeric) #"+ (i+1) +": ");
listNumber = scan.next();

// Clear buffer
scan.nextLine();

// Prompt for house description
System.out.print("Enter description for " +
"house #" +(i+1) + ": ");
listDesc = scan.nextLine();

// Prompt for house price
System.out.print("Enter listing price for "
+ "house #" +(i+1) + ": ");
listPrice = scan.nextDouble();

/* 2.
* create a HouseListing object using the input values and store/load
* the object in the array
*/
HouseListing house = new HouseListing(listNumber,listDesc,listPrice);
list[i]=house;
  
}
  
  
  
/* 3.
* Assign the 0th element of the array to the most expensive house
think ... you can't assign an object to a price but the object
has a method that may help you here ...
*/
  
mostExpensive=list[0].listPrice;
  
  
output = "Listings:\n";
/*
* loop below builds the output string
*/
  
for (int i = 0; i < list.length; i++) {
  
//output +=list[i] + "\n"; // [ This only prints the object address not the contents
// because here list[i] is an array object to
// invoke the object values to be able to see it.
  
// this line is modified for better output visualisation.
// because the above line only prints the output
// if you dont want to print the output completely and only address
// comment the modified line. This is done only for your better understanding.
  
output += "->" + list[i].listNumber +","+ list[i].listDesc +"," + list[i].listPrice + "\n";
  
  
/* 4.
Using a control structure, find and the store the double varaible
which holds the most expensive house (We don't need to listing #)
JUST THE PRICE
*/
if(mostExpensive < list[i].listPrice){
mostExpensive=list[i].listPrice;
}
  
}
// output
System.out.println(output);
System.out.println("The most expensive house on the market costs: $"
+ mostExpensive);
}
}

OUTPUT:

With modified line as described in the explanation .