Sensor

First of all, again, you have to create a LegoPort for you sensor, mentioned in LegoPort

LegoPort port = new LegoPort(LegoPort.INPUT_1); //Input 1 is sensor port 1

Touch Sensor

1. Import the TouchSensor class

   import ev3dev.hardware.sensors.TouchSensor

2. Create a touch sensor instance and play with it.

   TouchSensor touch = new TouchSensor(port);
   while(true){
       if (touch.isPressed()){
           System.out.println("Pressed!");
       }
   }

Color Sensor

1. Import the ColorSensor class

   import ev3dev.hardware.sensors.ColorSensor

2. Create a touch sensor instance and play with it.

   ColorSensor color = new ColorSensor(port);
   //...further more later.