ArrayList.remove() is not removing an object

Question

I know this is a messy implementation, but I basically have this code (I wrote all of it), and I need to be able to remove a student or instructor from the list when using t

Answer 1

Overriding the equals method of Student and Instructor will work:

Here is an example for the Student class:

public boolean equals(Object other){
    if(other == null) return false;
    if(other == this) return true;
    if(!(other instanceof Student)) return false;
    Student otherStudent = (Student)other;
    return otherStudent.id.equals(this.id);
}

You may also want to override hashCode():

public String hashCode(){
    return new HashCodeBuilder(17, 31).
        append(name).
        append(id).
        toHashCode();
}