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If you do want alphabetical order, and as long as you don't have duplicates, you can

TreeSet<String> tSet = new TreeSet<String>();

// for each person
String str = p.getName();
tSet.add(str);...

The people's name or the Person themselves?

There is a class called ArrayList<aClass> which works like an array in that it uses arrays internally but creates new arrays when it exceeds a certain...

Let's see what this does:



public class Person {

private String forename;
private String surname;
private int age;
private String personID;

Person(johnSmith001, "John", "Smith", 43);//Error here, on "Person("

Person p = new Person(Person x, "John", "Smith", 43);

Ok, you don't have a variable called ID.