Java tutorial
import java.util.Set; import java.util.TreeSet; class Product implements Comparable<Product> { String prodName; int prodID; Product(String str, int id) { prodName = str; prodID = id; } public int compareTo(Product p2) { return prodName.compareToIgnoreCase(p2.prodName); } public boolean equals(Object p2) { return prodName.compareToIgnoreCase(((Product) p2).prodName) == 0; } } public class Main { public static void main(String args[]) { Set<Product> prodList = new TreeSet<Product>(); prodList.add(new Product("A", 1)); prodList.add(new Product("B", 0)); prodList.add(new Product("C", 2)); prodList.add(new Product("D", 4)); for (Product p : prodList) System.out.printf("%-14s ID: %d\n", p.prodName, p.prodID); } }