0023 | Collections Framework
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 import java.util.*; class Product implements Comparable<Product> { public int id; public String name; public int qty; public double price; public Product(int id, String name, int qty, double price) { this.id = id; this.name = name; this.qty = qty; this.price = price; } public String toString() { return this.id + ” : ” + this.name + ” : “ + this.qty + ” : “ + this.price; } public int compareTo(Product s) { return s.qty - this.qty; } }
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 import java.util.*; class ProductDB { public static void main(String[] args) { List<Product> db = new LinkedList<Product>(); db.add(new Product(1, “pen”, 20, 5.50d)); db.add(new Product(2, “ruler”, 18, 10.00d)); db.add(new Product(3, “notebook”, 15, 18.50d)); db.add(new Product(4, “rubber”, 40, 15.00d)); db.add(new Product(5, “pencil”, 25, 3.00d)); Collections.sort(db); for (Product i : db) { System.out.println(i); } } }
Tags: collection, list, sorting