How to access in Array List model class

Question

This is array list model class. Is it right or wrong? I can not access this class from another class

public class CartOrder {
    List<CartOrder.Data> data;

    public List<Data> getData() {
        return data;
    }

    public void setData(List<Data> data) {
        this.data = data;
    }

    class Data {
        String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

Trying to edit your post into a more readable version, it's not clear: is the class `Data` an inner class of `CartOrder` — daniu, Apr 09 '18 at 07:43
"I can not access this class from another class" make it public — Michael, Apr 09 '18 at 07:45
i want to set Name in inner class of CartOrder from another class .i can not access inner class of CartOrder — Areyen, Apr 09 '18 at 07:47
Can you add the source code of the other class, where you want to make that modification? — Dominique, Apr 09 '18 at 07:51
how can i data set in setName from another class.how can i create CartOrder class object .@daniu — Areyen, Apr 09 '18 at 07:52
This is another class code from where i want to access model CartOrder cartOrder=new CartOrder(); cartOrder.setData(); @Dominique — Areyen, Apr 09 '18 at 07:53

XtremeBaumer · Accepted Answer · 2018-04-09T08:06:04.217

If you would have read the exception properly, then you would have also read the solution to your problem. You need to instantiate CartOrder object first on which you then can call s.new Data() as seen below

public static void main(String[] args) {
    CartOrder s = new CartOrder();
    Data d = s.new Data();
    d.setName("Test");
    s.addData(d);
    System.out.println(s);
}

Modified your existing class:

public class CartOrder  {
    List<Data> data;

    public CartOrder () {
        data = new ArrayList<Data>();
    }

    public List<Data> getData() {
        return data;
    }

    public void setData(List<Data> data) {
        this.data = data;
    }

    public void addData(Data data) {
        this.data.add(data);
    }

    class Data {
        String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

others line is ok but s.addData(d) given exception – Areyen Apr 09 '18 at 08:03 — Areyen, Apr 09 '18 at 08:03
Because I added that method for myself – XtremeBaumer Apr 09 '18 at 08:05 — XtremeBaumer, Apr 09 '18 at 08:05
so how to inner class data add in array list – Areyen Apr 09 '18 at 08:10 — Areyen, Apr 09 '18 at 08:10

score 0 · Answer 2 · answered Apr 09 '18 at 07:59

0

similar question here

But yes your code is accurate. If you make your member property private Data::name then it cannot be accessed by anything but the factory class (class Data). Same would be true for your other function and its member.

answered Apr 09 '18 at 07:59

chasester

9
5

score 0 · Answer 3 · answered Apr 09 '18 at 08:05

I'm assuming you want to use it like:

CartOrder.Data data = new CartOrder.Data();

In order for that to work you should make you inner class static, so you code would become

public class CartOrder {
    List<CartOrder.Data> data;

    public List<Data> getData() {
        return data;
    }

    public void setData(List<Data> data) {
        this.data = data;
    }

    static class Data {
        String name;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }
    }
}

After that you can use this like:

public void someMethodInSomeOtherClass() {
    // ...
    CartOrder cartOrder = new CartOrder();

    CartOrder.Data someData = new CartOrder.Data();
    someData.setName("Luke");

    CartOrder.Data moreData = new CartOrder.Data();
    moreData.setName("Han");

    cartOrder.setData(Arrays.asList(someData, moreData));
    // ...
}

How to access in Array List model class

3 Answers3