Question

Assume the existence of an interface, CommDevice, with the following methods :

Answer 1

Answer:

public class Firewall implements CommDevice { String permittedReceiver, buffer; Firewall(String str) { permittedReceiver = str; } public void transmit(String s1, String s2) { permittedReceiver = s1; buffer = s2; System.out.println("Data scheduled for transmission to " + s1); } public boolean receive(String s1, String s2) { boolean condition; if (s1.equals(permittedReceiver)) { buffer = s2; condition = true; } else { buffer = ""; System.out.println("Attempted breach of firewall by " + s1); condition = false; } return condition; } }

Explanation: