Converting an array into Array List

Question

Hi I have two Java Files as below:

            case 6:  
                System.out.println("List All Property Details For Rent >>>");
//              System.out.println(Arrays.toString(Property_list));
                int i=0;
                while(i<count){
                    ppty.property_list[i].viewPropertyDetails("RENT");
                    i++;
                }
                System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
                break; 

        }

    }




    }

}

Guys, This is basically an array of properties, and a Menu to do some operation with the list. I was planning to improve my code with a java ArrayList, because its more dynamic in nature. Could anyone tell me how I can convert this array (property_list) into an ArrayList? What are the changes do I need to make? Thanks in advance.

Also is there anyway I can improve my Menu5(To remove a property), currently am using kind of "cheating method" by changing the status.. Much appreciate ur kind advices — vellattukudy, Jun 19 '16 at 07:28
Because I can use `ArrayList a = new ArrayList<>(Arrays.asList(strings)); a.remove(i);` to remove an object from array also.. — vellattukudy, Jun 19 '16 at 07:39
Not really Sanjeev. I don't want to use any extra code to change my array into an ArrayList. I want to replace my codes with the arraylist methods.. — vellattukudy, Jun 19 '16 at 07:41

score 1 · Answer 1 · answered Jun 19 '16 at 08:00

Your commented code is perfectly valid for initiliazing the arrayList.

ArrayList<Property> property_list = new ArrayList<Property>();

In java 7 or later you don't need to specify the second Property:

ArrayList<Property> property_list = new ArrayList<>();

Unlike the java Array you don't use bracket notation to access your variables you use .get(int index):

ppty.property_list.get(count)

To add a value you use .add(Object item);

ppty.property_list.add(new Property());

And you don't need to remember the size of ArrayList by storing it in a variable. The ArrayList has the .size() method which returns the number of elements in it.

Extra tips:

Here you can find extra methods the ArrayList has https://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html
You have setters and getters in your Property object. You could set the member variables to private and use them.

You should replace that ppty method with the constructor method like so:


public Property(int streetno,String streetname,
            String suburb,
            int postalcode,String contactperson,
            String office,int phonenumber,
            String openTime,String propertytype,
            double price, String date){
                this.StreetNumber = streetno;
        this.StreetName=streetname;
        this.Suburb=suburb;
        this.PostalCode=postalcode;
        this.ContactPerson=contactperson;
        this.PhoneNumber=phonenumber;
        this.Office=office;
        this.OpenTime=openTime;
        this.PropertyType=propertytype;
        this.PropertyPrice=price;
        this.Date = date;

}

This property_list should not be inside your Property object. This is something you should handle outside the object. For example in your public void displayMenuPanel() you could say ArrayList<Property> properties = new ArrayList<>(). If you put the list inside the object then it is tied with that object. If the object goes, the list goes.

Converting an array into Array List

1 Answers1