Accessing Methods from ArrayList of Objects

Question

I was wondering how to access specific elements of objects in an ArrayList using methods, yet I can't seem to get it to work.
I have a Phone object that has an int price and String color, as well as a method that returns the color.

public class Phone

{
private int price;
private String color;

public String getColor()
{
return color;
}

Now let's say I created an array list of Phone objects called phoneCatalog, and added various Phones. How can I count how many phones are red? This is my attempt that isn't working:

int count = 0;

for(int x = 0; x < phoneCatalog.size(); x++)
if((phoneCatalog.get(x)).getColor.equals("red")
count++;

if((phoneCatalog.get(x)).getColor.equals("red") should be if(phoneCatalog.get(x).getColor().equals("red") right? what do you mean This is my attempt that isn't working? tell us the problem — wei
– wei, Commented May 11, 2020 at 12:25

Swati · Accepted Answer · 2020-05-11 12:22:35Z

2

You need put your count inside your if-statment so that every time the conditon becomes true the value of count will get updated .Like below :

    public class Main {
    private int price;
    private String color;
    public Main(int price, String color) {
        this.price = price;
        this.color = color;


    }
    public String getColor() {
        return color;
    }
    public int getPrice() {
        return price;
    }
    public static void main(String[] args) {
        System.out.println("Hello World");
        ArrayList < Main > list = new ArrayList < Main > ();
        list.add(new Main(1, "Red")); //Adding object in arraylist    
        list.add(new Main(2, "Blue"));
        list.add(new Main(3, "Red"));
        list.add(new Main(4, "Red"));
        int count = 0;
        //looping through values
        for (int i = 0; i < list.size(); i++) {
            //checking all value in array list 
            if (list.get(i).getColor().equals("Red")) {
                count++;//increment count
            }
        }
        System.out.println("Total Red Color are " + count);
    }
}

Output :

Total Red Color are 3

answered May 11, 2020 at 12:22

Swati

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2 Comments

Aniket Sahrawat Over a year ago

Don't want to be a critic but the whole psvm can be replaced with 1 line: long count = Stream.of(new Main(1, "Red"), new Main(...), ...).map(Main::getColor).filter(c -> c.equals("Red")).count();

Swati Over a year ago

Didn't know about that .Thanks for your suggestion .

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