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Attempt to invoke interface method 'int java.util.List.size()' on a null object

Rich Raccoon answered on June 12, 2022 Popularity 6/10 Helpfulness 2/10

answer Attempt to invoke interface method 'int java.util.List.size()' on a null object

Attempt to invoke interface method 'int java.util.List.size()' on a null object

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So basically one of your object is empty.
  
in my code,
I created dataList (object of List<PostPojo>) of Class RecyclerAdapter 
I use the same object name in Constructor.
  
at line 30, 
the dataList of class was intializes it self not by constructor.
So I just change the name of constructor variabe from dataList to data
And it worked.

Note:
using same name of class and constructor always worked for me
so im not sure why this time it not worked.
 
  ***************************************************


public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{

    private Context context;
    private List<PostPojo> dataList;  ===> Class Object


    public RecyclerAdapter(Context context, List<PostPojo> dataList) ===>Constructor 
    																		object
    {

        this.context = context;
        this.dataList = dataList;    ===> initializes itself
    }

  
  
  *************************************
  
  Changing it to
  
  
  public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{

    private Context context;
    private List<PostPojo> dataList; ===> class object


    public RecyclerAdapter(Context context, List<PostPojo> data){==> Constructor 
    																 object

        this.context = context;
        this.dataList = data;          ===> initializes by constructor obj
    }

Popularity 6/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: interface invoke java null object

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Contributed on Jun 12 2022

Rich Raccoon

0 Answers Avg Quality 2/10

Attempt to invoke interface method 'int java.util.List.size()' on a null object

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