/** * This class test generic functionality */ public class GenericTest { /** * main */ public static void main(String[] args) { // AGen with Integer type param AGen intA = new AGen(4); intA.add(16); intA.add(32); intA.add(64); addToGeneric(intA, 128); for (int i=0; i < intA.size(); i++){ System.out.println( (int)intA.get(i)); } // AGen with String type param AGen strA = new AGen(); strA.add("hello"); addToGeneric(strA, "world"); for (int i=0; i < strA.size(); i++){ System.out.println( strA.get(i)); } } /** *This adds the obj to the AGen * * Unbounded generic methods are * used to express dependencies among the * types of one or more arguments of a * method and/or its return type. */ private static void addToGeneric (AGen aGenArr, Y obj) { // appending Y param to AGen of // of type Y aGenArr.add(obj); } } /** * This is a basic Generic class using type * parameter T. This class simply allows a * client to add and retrieves objects to a * generic array. */ class AGen{ T[] t; int size = 0; @SuppressWarnings("unchecked") public AGen(){ t = (T[]) new Object[10]; } @SuppressWarnings("unchecked") public AGen(int cap){ t = (T[]) new Object[cap]; } public T get(int i){ return t[i]; } public void add(T obj){ this.t[size] = obj; size++; } public int size(){ return size; } }

Generic Example