How to input the objects to a ArrayList <HashMap<String,Object>>

Question

I have 1 object(Goods) have 2 attributes: String and boolean. How to input object Goods to ArrayList<HashMap<String, Object>> ? Because I want input ArrayList<HashMap<String, Object>> to SimpleAdapter

public class Goods {
    private String goodsName;
    private boolean isCheck = false;
    public String getGoodsName() {
        return goodsName;
    }
    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }
    public boolean isCheck() {
        return isCheck;
    }
    public void setCheck(boolean isCheck) {
        this.isCheck = isCheck;
    }
}

u want to store the goodsName and isCheck in array list or the whole Goods object ?? — Panther
– Panther, Commented Oct 24, 2014 at 3:35
What do you want to store List of Goods or List of HashMap ? — Qadir Hussain
– Qadir Hussain, Commented Oct 24, 2014 at 3:43
you really want a list of hashmaps for each object? or you just want a list of named objects? this question seems very similar to a response to an earlier question.. — CharlieS
– CharlieS, Commented Oct 24, 2014 at 3:46
Yes!I want to input whole object Goods ArrayList<HashMap<String, Object>> — Quoc Danh Ngo
– Quoc Danh Ngo, Commented Oct 24, 2014 at 3:47

candied_orange · Accepted Answer · 2014-10-24 04:29:17Z

1

package ngo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        Goods g = new Goods();
        g.setGoodsName("foo");
        g.setCheck(true);

        Map<String, Goods> map = new HashMap<String, Goods>();
        map.put(g.getGoodsName(), g);

        List<Map<String, Goods>> list = new ArrayList<Map<String, Goods>>();
        list.add(map);

        System.out.println(list.get(0).get("foo").isCheck());
    }
}

Displays true

This should be an acceptable, if simple, structure for the data parameter of SimpleAdapter's constructor. A more exhaustive example of it's use can be found here

edited Oct 24, 2014 at 4:29

answered Oct 24, 2014 at 3:48

candied_orange

7,5542 gold badges32 silver badges66 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

simo.3792 · Accepted Answer · 2014-10-24 04:04:05Z

0

The following is the basic example, not runnable in itself.

ArrayList<HashMap<String, Goods>> listOfMappedGoods = new ArrayList<HashMap<String, Goods>>();

HashMap<String, Goods> goodsList = new HashMap<String, Goods>();

Goods g = new Goods();
g.setGoodsName("foo");
g.setCheck(true);

goodsList.add(g.getGoodsName(), g);
listOfMappedGoods.add(goodsList);

The point to note, is that just like every new Goods object needs to be created using new Goods(), each new goodsList needs to be created also using new HashMap<String, Goods>().

If you use something like goodsList.clear(), then you are still referring to the original map that was first added to the listOfMappedGoods, so you will clear that instead.

answered Oct 24, 2014 at 4:04

simo.3792

2,2331 gold badge19 silver badges29 bronze badges

Collectives™ on Stack Overflow

How to input the objects to a ArrayList <HashMap<String,Object>>

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related