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An ArrayList - an extendable array
this example from a Well House Consultants training course
Source code: Viv.java Module: J050
public class Viv {
/* If you don't know how many elements you'll want in an array to start with, you can use a Vector or an ArrayList from the java.util package ... this example uses the ArrayList which is the more modern. As it's a collection object type rather than an array, you can't use the [] notation to access individual members, but must use methods instead. The add method appends a new element (i.e. extends the ArrayLis) and the set and get methods are then used to rewrite and read the elements which (now) exist. */ public static void main (String [] args) { java.util.ArrayList<Peter> trowbridge = new java.util.ArrayList<Peter>(); trowbridge.add(new Rolf("First Great Western",75,3,60)); trowbridge.add(new Rolf("South West Trains",72,5,80)); trowbridge.add(new Steve("First Avon and Somerset",61,30)); trowbridge.add(new Steve("Faresaver",21,20)); trowbridge.add(new Steve("Go Whippet",41,25)); for (int k=0; k<trowbridge.size(); k++) { Peter Davis = (Peter)(trowbridge.get(k)); String runby = Davis.getopo(); int crush = ((Peter)(trowbridge.get(k))).getpass(); System.out.println(runby + " will carry " + crush + " people"); } } } /* Sample output --------------------------------- Dorothy-2:java grahamellis$ java Viv First Great Western will carry 225 people South West Trains will carry 360 people First Avon and Somerset will carry 61 people Faresaver will carry 21 people Go Whippet will carry 41 people Dorothy-2:java grahamellis$ */ Learn about this subject
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