Execution code for the program

src/Main.java

+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+
+public class Main {
+
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		int time = 0;
+		
+		OrderMatching orderMatching = new OrderMatching();
+		
+		do {
+			System.out.println("Provide input in this format:");
+			System.out.println("type,from,stock,qnt,price");
+			String line = br.readLine();
+			String[] inputs = line.split(",");
+
+			Customer c = new Customer(inputs[1]);
+			Stock stock = new Stock(inputs[2]);
+			Order order;
+			
+			if ("sell".compareToIgnoreCase(inputs[0]) == 0) {
+				order = new SellOrder(time++, c, stock, Integer.parseInt(inputs[3]), Integer.parseInt(inputs[4]));
+			} else {
+				order = new BuyOrder(time++, c, stock, Integer.parseInt(inputs[3]), Integer.parseInt(inputs[4]));
+			}
+			
+			// check if order is valid
+			if (!orderMatching.validate(order)) {
+				System.out.println("Invalid order provided!");
+			}
+			
+			ArrayList<Order> matchedOrders = orderMatching.findMatchedOrders(order);
+			
+			if (!matchedOrders.isEmpty()) {
+				System.out.print("Following trades happened for " + order.getType() + " order: ");
+				System.out.println(order);
+				int count = 1;
+				
+				for (Order o : matchedOrders) {
+					System.out.print(count++ + ": ");
+					System.out.println(o);
+				}
+			}
+			
+			System.out.println();
+		} while (true);
+
+	}
+
+}