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I know this question has been asked several times in stackoverflow but somehow still had some trouble figuring out a solution. The following example I think is a good case to have static methods public class ConnectionFactory { public static Connection createConnection(ConnectionType connectionType, String ipAddr, Integer port) { //Some error checking switch(connectionType) { case TCP: return createTcpConnection(ipAddr, port); case UDP: return createUdpConnection(ipAddr, port); case RTP: return createRtpConnection(ipAddr, port); case SCTP: return createRtpConnection(ipAddr, port); default: break; } } // TcpConnection, RtpConnection, SctpConnection and UdpConnection implement interface Connection public Connection createTcpConnection() { Connection connection = new TcpConnection(); ..... ..... return connection; } public Connection createUdpConnection() { Connection connection = new UdpConnection(); ..... ..... return connection; } .... .... } And suppose if I have a CommunicationService like the following public class CommunicationService { public void initConnectionPool(ConnectionType connectionType) { for(int i = 0; i < MAX_CONNECTIONS; i++) connectionList.add(ConnectionFactory.createConnection(connectionType, "domain.com", 40203)); //Some more code here to do further processing ...... ...... } //Some more methods } Like this, different communication services can create and maintain multiple type of connections. I want to test initConnectionPool method and in a unit test environment, socket creation will

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