SimpleInput.java

import java.io.*;
import java.util.ArrayList;
import javax.sound.midi.*;

class SimpleInput {
    static final int DEVICE_IN  = 0;
    static final int DEVICE_OUT = 3;

    public static void main (String[] args) {
        dumpDeviceInfo();

        ArrayList<MidiDevice> devices = getDevices();
        MidiDevice device_input  = devices.get(DEVICE_IN);
        MidiDevice device_output = devices.get(DEVICE_OUT);
        if (!(device_output instanceof Synthesizer)) {
            throw new IllegalArgumentException("not a Synthesizer!");
        }

        try { // connet nanoKEY transmitter to Software synthesizer
            Transmitter trans // nanoKEY
                = device_input.getTransmitter();
            Receiver recv  // Java Sound Synthesizer
                = device_output.getReceiver();

            if (!device_output.isOpen()) {
                device_output.open();
            }
            trans.setReceiver(recv);
        } catch (MidiUnavailableException e) {
            System.err.println(e.getMessage());
            System.exit(0);
        }
    }

    public static ArrayList<MidiDevice> getDevices() {
        ArrayList<MidiDevice> devices = new ArrayList<MidiDevice>();

        MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();
        for (int i = 0; i < infos.length; i++) {
            MidiDevice.Info info = infos[i];
            MidiDevice dev = null;
            try {
                dev = MidiSystem.getMidiDevice(info);
                devices.add(dev);
            } catch (SecurityException e) {
                System.err.println(e.getMessage());
            } catch (MidiUnavailableException e) {
                System.err.println(e.getMessage());
            }
        }
        return devices;
    }

    public static void dumpDeviceInfo() {
        ArrayList<MidiDevice> devices = getDevices();

        for (int i = 0; i < devices.size(); i++) {
            MidiDevice device = devices.get(i);
            MidiDevice.Info info = device.getDeviceInfo();
            System.out.println("[" + i + "] devinfo: " + info.toString());
            System.out.println("  name:"        + info.getName());
            System.out.println("  vendor:"      + info.getVendor());
            System.out.println("  version:"     + info.getVersion());
            System.out.println("  description:" + info.getDescription());
            if (device instanceof Synthesizer) {
                System.out.println("  SYNTHESIZER");
            }
            if (device instanceof Sequencer) {
                System.out.println("  SEQUENCER");
            }
            System.out.println("");
        }
    }
}