ArrayList indexOf

Hi i'm just studying over ArrayLists and i have encountered a problem, i'm trying to get the index of an element but it keeps returning -1. Here's the code

Java Code:

import java.util.ArrayList;


public class PhoneEntry {
        String name;
        String phone;
        
public PhoneEntry(String name, String phone) {
        this.name = name;
        this.phone = phone;
        }
        public static void main(String[] args){

        ArrayList<PhoneEntry> theDirectory = new ArrayList<PhoneEntry>();
        theDirectory.add(new PhoneEntry("Jane","12"));
        System.out.println(theDirectory.size());
        int index = theDirectory.indexOf(new PhoneEntry("Jane","12"));
        System.out.println(index);
        }

        
}

I know the list is not empty because it returns a size.