How do I send command to the equiment2, 3 and 1 in the following java program?

import java.util.*; public interface Equipment { public String getStatus(); public void sendCommand(); } class Equipment2 implements Equipment { public String getStatus() { return "Status from real Equipment2"; } public void sendCommand() { // send command to real Equipment2 } } class Equipment3 implements Equipment { public String getStatus() { return "Status from real Equipment3"; } public void sendCommand() { // send command to real Equipment3 } } class SimEquipment1 implements Equipment { public SimEquipment1(EquipmentImplementation equipmentImplementation) { } public String getStatus() { return "Status from SimEquipment1"; } public void sendCommand() { // send command to SimEquipment1 } } class SimEquipment2 implements Equipment { public String getStatus() { return "Status from SimEquipment2"; } public void sendCommand() { // send command to SimEquipment2 } } class SimEquipment3 implements Equipment { public String getStatus() { return "Status from SimEquipment3"; } public void sendCommand() { //send command to SimEquipment3 } } class EquipmentImplementation { public void getStatus() { //get status from hardware } public class GUI { public static void main(String[] args) { Equipment equipment = new SimEquipment1(new EquipmentImplementation()); equipment.getStatus(); equipment.sendCommand(); } } }