making object arraylist from file.txt

[matthew reid]

Hello I'm trying to remake an object from a text file. I think I got most of it to work but I don't know how to make a Boolean from a String or LocalDate from a String. Is it even possible?

	private void importFile()
	{
		String fileName = "sales.txt";
		String address;
		String type;
		int area;
		int room;
		int toilet;
		int garage;
		String ownName;
		int ownPh;
		int price;
		String agentName;
		int agentPh;
		boolean finalize
;

		try
		{


			BufferedReader input = new BufferedReader(new FileReader(fileName));
			Scanner sc = new Scanner(input).useDelimiter("\\s*dot\\s*");
			if(!input.ready())
			{
				throw new IOException();
			}
			address = sc.next();
			type = sc.next();
			area = sc.nextInt();
			room = sc.nextInt();
			toilet = sc.nextInt();
			garage = sc.nextInt();
			ownName = sc.next();
			ownPh = sc.nextInt();
			price = sc.nextInt();
			agentName = sc.next();
			agentPh = sc.nextInt();
	//		finalize = sc.next();
	//		LocalDate startDay = new LocalDate(sc.nextLocalDate());
	//		LocalDate endDate = new LocalDate(sc.nextLocalDate());
			salesArray.add(SaleOffer(	address, type, area, room,
										toilet, garage, ownName, ownPh,
										price, agentName, agentPh, finalize,
                                                                                startDate, endDate));

			input.close();
		}
		catch (IOException e)
		{
			System.out.println(e);
		}
	}

[Liutauras Vilda]

Hi matthew,

What you are saying, you want [1] read a file, [2] create an object containing read information. Right?

Did you create a class, which defines a blueprint for an object you want to create?

Your method importFile() doesn't make sense, in short - it isn't correct, over complicated and does a lot stuff which aren't related with method's name.

Methods supposed to do one and only one thing. So you importFile() method should be probably one liner if we were know what import means.

Is it school's assignment? In case yes, can we see some of instructions you have been given?

[Liutauras Vilda]

matthew reid wrote:Boolean from a String or LocalDate from a String. Is it even possible?

Yes, that is possible. But probably you first need to create a class which could hold all that information.

I see you have SaleOffer. Actually feels like you have too few classes. Because if class has more than 3-5 parameters, it is a good indication that design is flawed.

Can you please post SaleOffer class in full here?

[matthew reid]

Objectives

• Develop a Java GUI application using layout managers
• Develop an application that uses two or more classes
• Read and/or write from/to text files
• Use search algorithms and/or sort algorithms
• Use ArrayList or LinkedList or any other data structure

General

In your assignment 2, you can continue to develop the Java GUI application that you have created in your assignment 1. If you would like to modify the codes that you have submitted in your assignment 1, you are free to do so. You can adopt any layout patterns that are suitable for the requirements of the application in your assignment 2.  

Assignment Task specification

CQRE has requested you to help them finalize the property sale deal based on the following rules:
1. Identify the purchase offer that has the highest offered amount for a property sale offer.
2. The identified highest offered amount should be at least 90% of the seeking price of the sale offer.
3. In case of matching amount of purchase offers, the decision is up to the seller.
4. Purchase offers are not allowed after a property sale is finalized.

CQRE also wants to view the commission amount receivable for each of the property sale that has been finalized.  Hence, you need to store the relevant details in text file(s) and also to provide appropriate searching facilities to display the details of finalized property sale(s) which have been assigned/managed by the given employee.

Hence in addition to the requirements of the assignment 1, the software application that you will develop in assignment 2 should perform all of the following:

1. When the application is started, it should read the details of the property sale offers from the existing text file(s) and display the latest property sale offer.
2. The application should provide control(s) to finalize the property sales.
3. The application should provide details of all finalized property sales including the commission amount receivable.
 

4. The application should provide necessary controls to search and display the details of finalized property sales which have been assigned/managed by a given/selected employee (details to be obtained from/ selected by the user). If the search criterion is not met then an appropriate message has to be displayed.
5. The application should have the facility to append/save the details of new property sale offers and respective purchase offers and finalized status (finalized or not) in relevant text file(s).

In order to include these additional changes in the Java GUI application, you may need to do any or all of the following:
• develop additional Java classes
• extend the existing Java classes that you have developed for your assignment 1
• implement newly created interface(s)

For the assignment 2, you may need additional controls and you are encouraged to develop your own GUI layout.  Please note that you can create the required text file(s) through your application program for storing the data initially. During the subsequent run the same file(s) can be used by your application appropriately.

/*
Programmer: Matthew Reid
Student ID: s0274364
Course: Object Oriented Programming COIT11222
File: SaleOffer.java
Date: 10 April 2017
Purpose: Assignment One -- Real Estate GUI
*/
import java.time.LocalDate;
import java.util.*;

public class SaleOffer extends Property
{

    private LocalDate startDate;
    private LocalDate endDate;
    private int price;
    private String agentName;
    private int agentPhone;
    private String ownerName;
	private int ownerPhone;
	private boolean finalize;

    public SaleOffer(String propAddress, String propType,
    					int propArea, int numRoom,
    					int numToilet, int numGarage,
    					String ownerName, int ownerPhone,
    					int price, String agentName,
    					int agentPh, boolean finalize)
    {
        super(propAddress, propType, propArea, numRoom, numToilet, numGarage);
        this.price = price;
        this.agentName = agentName;
        this.agentPhone = agentPh;
        this.ownerName = ownerName;
        this.ownerPhone = ownerPhone;
        this.startDate = LocalDate.now();
        this.endDate = startDate.plusDays(28);
        this.finalize = finalize;
    }

    public SaleOffer(String propAddress, String propType,
    					int propArea, int numRoom,
    					int numToilet, int numGarage,
    					String ownerName, int ownerPhone,
    					int price, String agentName,
    					int agentPh, LocalDate startDate, LocalDate endDate, boolean finalize)
    {
        super(propAddress, propType, propArea, numRoom, numToilet, numGarage);
        this.price = price;
        this.agentName = agentName;
        this.agentPhone = agentPh;
        this.ownerName = ownerName;
        this.ownerPhone = ownerPhone;
        this.startDate = startDate;
		this.endDate = endDate;
        this.finalize = finalize;
    }

    public static Comparator<SaleOffer> ownNameSort = new Comparator<SaleOffer>()
    {

		public int compare(SaleOffer a1, SaleOffer a2)
		{
			String name1 = a1.getOwnerName().toUpperCase();
			String name2 = a2.getOwnerName().toUpperCase();

		   //ascending order
		   return name1.compareTo(name2);

		   //descending order
		   //return name2-name1;
    	}
    };

    public LocalDate getStartDate()
    {
        return startDate;
    }

    public LocalDate getEndDate()
    {
        return endDate;
    }

    public int getPrice()
    {
        return price;
    }

    public void setPrice(int price)
    {
        this.price = price;
    }

    public String getOwnerName()
    {
	    return ownerName;
	}

	public void setOwnerName(String ownerName)
	{
	    this.ownerName = ownerName;
	}

	public int getOwnerPhone()
	{
		return ownerPhone;
	}

	public void setOwnerPhone(int ownerPhone)
	{
		this.ownerPhone = ownerPhone;
    }

    public String getAgentName()
    {
	    return agentName;
	}

	public void setAgentName(String agentName)
	{
	    this.agentName = agentName;
	}

    public int getAgentPhone()
    {
	    return agentPhone;
	}

	public void setAgentPhone(int agentPhone)
	{
	    this.agentPhone = agentPhone;
	}

    public boolean getFinalize()
    {
        return finalize;
    }

    public void setFinalize(boolean fin)
    {
        this.finalize = fin;
    }

    @Override
    public String toPropertyString()
    {
        return ""+super.toPropertyString() + "Owners name: "
        				+ ownerName + "   Owners Phone: "
        				+ ownerPhone + "\nPrice: $" + price + "\n"
        				+ "Date added: " + startDate
        				+ "   Date ending: " + endDate + "\nFinalized: " + finalize;
    }
    public String toFileString()
    {
        return ""+super.toFileString() + "dot"
        				+ ownerName + "dot"
        				+ ownerPhone + "dot" + price
        				+ "dot" + startDate
        				+ "dot" + endDate + "dot" + finalize;
    }
}

class PriceComparator implements Comparator<Property> {



    @Override
		public int compare(Property p1, Property p2)
		{
                    int price1 = 0;
                    int price2 = 0;
                    if(p1 instanceof SaleOffer && p2 instanceof SaleOffer){


                         price1 = ((SaleOffer)p1).getPrice();
			 price2 = ((SaleOffer)p2).getPrice();
                    }

		   //ascending order
		   return price1-price2;

		   //descending order
		   //return price2-price1;
    	}
    };

   class NameComparator implements Comparator<Property> {



       @Override
   		public int compare(Property n1, Property n2)
   		{
        	String name1 = "";
            String name2 = "";
            if(n1 instanceof SaleOffer && n2 instanceof SaleOffer)
            {
				name1 = ((SaleOffer)n1).getOwnerName();
   			 	name2 = ((SaleOffer)n2).getOwnerName();
                       }

   		   //ascending order
		   return name1.compareTo(name2);

   		   //descending order
   		   //return name2.compareTo(name1);
       	}
    };

[Liutauras Vilda]

public class SaleOffer extends Property

Why SaleOffer extends Property? SaleOffer IS-A Property? What is that Property?

And please tell now, where exactly your problem is?

[s ravi chandran]

Just a thought on this. Isn't this the exact use case where we can directly use serialization?

Serialize to file and then read the file and load the object.

[Liutauras Vilda]

Why propAddress, propType propArea, numRoom, numToilet numGarage are in SaleOffer class and not in Property?

[matthew reid]

Liutauras Vilda wrote:

public class SaleOffer extends Property

Why SaleOffer extends Property? SaleOffer IS-A Property? What is that Property?

should I have all saleOffers and purchaseOffers all in the property class instead of having each class

And please tell now, where exactly your problem is?

my problem is when it reads the file the string cant be converted to Boolean and I cant figure out the date

C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:763: error: incompatible types: String cannot be converted to boolean
			finalize = sc.next();
			                  ^
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:764: error: cannot find symbol
			LocalDate startDay = new LocalDate(sc.nextLocalDate());
			^
  symbol:   class LocalDate
  location: class Test
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:764: error: cannot find symbol
			LocalDate startDay = new LocalDate(sc.nextLocalDate());
			                         ^
  symbol:   class LocalDate
  location: class Test
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:764: error: cannot find symbol
			LocalDate startDay = new LocalDate(sc.nextLocalDate());
			                                     ^
  symbol:   method nextLocalDate()
  location: variable sc of type Scanner
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:765: error: cannot find symbol
			LocalDate endDate = new LocalDate(sc.nextLocalDate());
			^
  symbol:   class LocalDate
  location: class Test
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:765: error: cannot find symbol
			LocalDate endDate = new LocalDate(sc.nextLocalDate());
			                        ^
  symbol:   class LocalDate
  location: class Test
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:765: error: cannot find symbol
			LocalDate endDate = new LocalDate(sc.nextLocalDate());
			                                    ^
  symbol:   method nextLocalDate()
  location: variable sc of type Scanner
C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:768: error: cannot find symbol
										price, agentName, agentPh, startDate,
										                           ^
  symbol:   variable startDate
  location: class Test
8 errors

Just a thought on this. Isn't this the exact use case where we can directly use serialization?

never heard of this before so I didn't know

Why propAddress, propType propArea, numRoom, numToilet numGarage are in SaleOffer class and not in Property?

these are in the property class

/*
Programmer: Matthew Reid
Student ID: s0274364
Course: Programming Fundamentals COIT11222
File: Property.java
Date: 26 January 2017
Purpose: Assignment One -- Real Estate Gui
*/

import java.util.*;

public class Property {
	String propAddress;				//	Address of the property
	private String propType;		//	Type of the property (house/unit/villa)
	private int propArea;		//	Area of the property (in square meters)
	private int numRoom;			//	Number of bed rooms available in the property
	private int numToilet;			//	Number of toilets available in the property
	private int numGarage;			//	Number of garages available in the property


    public Property() {
    }

    public Property(String propAddress, String propType, int propArea, int numRoom, int numToilet, int numGarage) {
        this.propAddress = propAddress;
        this.propType = propType;
        this.propArea = propArea;
        this.numRoom = numRoom;
        this.numToilet = numToilet;
        this.numGarage = numGarage;
    }

    public static Comparator<Property> addSort = new Comparator<Property>()
    {

		public int compare(Property a1, Property a2)
		{

			String add1 = a1.getPropAddress().toUpperCase();
			String add2 = a2.getPropAddress().toUpperCase();

		   //ascending order
		   return add1.compareTo(add2);

		   //descending order
		   //return add2.compareTo(add1);
    	}
    };

    public static Comparator<Property> typeSort = new Comparator<Property>()
    {

		public int compare(Property t1, Property t2)
		{

			String type1 = t1.getPropType().toUpperCase();
			String type2 = t2.getPropType().toUpperCase();

		   //ascending order
		   return type1.compareTo(type2);

		   //descending order
		   //return type2.compareTo(type1);
    	}
    };

    public static Comparator<Property> areaSort = new Comparator<Property>()
    {

		public int compare(Property a1, Property a2)
		{

			int area1 = a1.getPropArea();
			int area2 = a2.getPropArea();

		   //ascending order
		   return area1-area2;

		   //descending order
		   //return area2-area1;
    	}
    };

    public static Comparator<Property> roomsSort = new Comparator<Property>()
    {

		public int compare(Property a1, Property a2)
		{

			int room1 = a1.getNumRoom();
			int room2 = a2.getNumRoom();

		   //ascending order
		   return room1-room2;

		   //descending order
		   //return room2-room1;
    	}
    };

    public static Comparator<Property> carsSort = new Comparator<Property>()
    {

		public int compare(Property a1, Property a2)
		{

			int car1 = a1.getNumGarage();
			int car2 = a2.getNumGarage();

		   //ascending order
		   return car1-car2;

		   //descending order
		   //return car2-car1;
    	}
    };

    public Property(String propAddress) {
   	    this.propAddress = propAddress;
    }

    public String getPropAddress() {
        return propAddress;
    }

    public void setPropAddress(String propAddress) {
        this.propAddress = propAddress;
    }

    public String getPropType() {
        return propType;
    }

    public void setPropType(String propType) {
        this.propType = propType;
    }

    public int getPropArea() {
        return propArea;
    }

    public void setPropArea(int propArea) {
        this.propArea = propArea;
    }

    public int getNumRoom() {
        return numRoom;
    }

    public void setNumRoom(int numRoom) {
        this.numRoom = numRoom;
    }

    public int getNumToilet() {
        return numToilet;
    }

    public void setNumToilet(int numToilet) {
        this.numToilet = numToilet;
    }

    public int getNumGarage() {
        return numGarage;
    }

    public void setNumGarage(int numGarage) {
        this.numGarage = numGarage;
    }

    @Override
	public String toString()
    {
    	return "Address: " + propAddress + "\n";
   	}
	public String toPropertyString()
	{
		return "Address: "	+ propAddress + "\nType of Property: "
							+ propType + "\nSize of Area: "
							+ propArea + " SqM" + "\n" + "Bedrooms: "
							+ numRoom + "   Bathrooms: "
							+ numToilet + "   Car Ports: "
							+ numGarage + "\n";
	}
	public String toPurchaseString()
	{
		return "";
	}
	public String toFileString()
	{
		return "Address: "	+ propAddress + "dot"
							+ propType + "dot"
							+ propArea + "dot" + "dot"
							+ numRoom + "dot"
							+ numToilet + "dot"
							+ numGarage + "dot";
	}
}

[s ravi chandran]

Check this link: Serialization

This should fulfill your requirement.

[Carey Brown]

matthew reid wrote:

C:\Users\nick0\Desktop\CQ18\2017, Term 1\COIT11134 - Object Oriented Programming\Ass2\Test.java:764: error: cannot find symbol
			LocalDate startDay = new LocalDate(sc.nextLocalDate());
			                                     ^
  symbol:   method nextLocalDate()
  location: variable sc of type Scanner

Do you know how to look up methods in Javadocs API ?  If not, it is a crucial step in learning to code in Java.

This error points to the nextLocalDate() method of Scanner and says it's not found.

You can look at all the methods available to a Scanner HERE. Notice nextLocalDate() is not one of your options. You'll probably need to read the date in as a string and convert it. You'll need to know the format of the string.

P.S. When posting errors like this be sure to enclose them in Code tags otherwise the little caret (^) pointer won't line up.

[Carey Brown]

s ravi chandran wrote:Check this link: Serialization

This should fulfill your requirement.

This is a good suggestion but it depends on the wording of the requirements. If you are required to read/write a TEXT file, then serialization won't be an option. If on the other hand the requirements just say a FILE, then serialization would be an option. Serialization produces a binary file, not a text file.

Edit: For a novice, a delimited text file is probably easier to understand. Write out the fields as strings separated by tabs ('\t''). Then when you read in the file you can set up a Scanner to look for the tabs, or read line by line and use String.split("\t") to breakout the fields.

[s ravi chandran]

Carey Brown wrote:
This is a good suggestion but it depends on the wording of the requirements. If you are required to read/write a TEXT file, then serialization won't be an option. If on the other hand the requirements just say a FILE, then serialization would be an option. Serialization produces a binary file, not a text file.

Edit: For a novice, a delimited text file is probably easier to understand. Write out the fields as strings separated by tabs ('\t''). Then when you read in the file you can set up a Scanner to look for the tabs, or read line by line and use String.split("\t") to breakout the fields.

Got the point. I was just focussing on the ease of converting binary data to objects.

Certainly for beginners, the method that they find easy to understand should be used.

[Knute Snortum]

Do you know how to look up methods in Javadocs API ?  If not, it is a crucial step in learning to code in Java.  

There are two ways I do this.

1) If I'm looking for Scanner, I Google java 8 scanner and the API doc link is usually the first.
2) I start at https://docs.oracle.com/javase/8/docs/api/ and look under the All Classes frame.