Java ArrayList IndexOf - Finding Object Index

Question

Lets say I have a class

public class Data{
    public int k;
    public int l;
    public Data(int k, int l){
      this.k = k; 
      this.l = l;
    }
             


        

Answer 1

By convention you want to override hashcode also when you override equals

You will most probably find that the indexOf uses the hashcode method to match the object not the equals

If you use eclise to edit you code - eclipse will generate a good equals and hashcode method for you from the "source" menu.