Removing an entry in an Array List Java [duplicate]

I am doing an assignment where we have to use an Array List to make an application that store employee info (salary, name, ID #, start date). We were told to create a class for teh records of the employees. I have to make the program remove an entire entry from just the employee ID # which I'm having a hard time figuring out.

//removes entries from record using only ID
    String id;
    int i;
    id = idIn.getText();

below is the code for the creation of the class

  //class for employees
class employees{
    String first, last, id, date, salary;

    employees (String _first, String _last, String _id, String _date, String _salary){
        first = _first;
        last = _last;
        id = _id;
        date = _date;
        salary = _salary;

    }
}
    System.out.println(id);
    i = records.indexOf(id);
    System.out.println(i);

This is the creation of the Array list

//create array for records
ArrayList <employees> records = new ArrayList <employees>();

And this is how entries are added to the list

//add records to array

   employees e;
   String first, last, id, date, salary;
    first = firstIn.getText();
    last = lastIn.getText();
    id = idIn.getText();
    date = dateIn.getText();
    salary = salaryIn.getText();

    e = new employees (first, last, id, date, salary);
    records.add(e);

I get a value of -1 when searching for the index of the ID #