Java EV3 issue #001

import lejos.hardware.Button;
import lejos.hardware.motor.EV3LargeRegulatedMotor;
import lejos.hardware.motor.EV3MediumRegulatedMotor;
import lejos.hardware.port.MotorPort;
import lejos.hardware.port.SensorPort;
import lejos.hardware.sensor.EV3TouchSensor;
import lejos.hardware.sensor.EV3ColorSensor;
import lejos.hardware.sensor.EV3GyroSensor;
import lejos.hardware.sensor.EV3UltrasonicSensor;
import lejos.robotics.RegulatedMotor;
import lejos.robotics.SampleProvider;

public class Main {// global variables are initialized here:
    static RegulatedMotor EV3_MOTOR_LEFT;
    static RegulatedMotor EV3_MOTOR_RIGHT;
    static RegulatedMotor EV3_MOTOR_ARM;

    static EV3TouchSensor EV3_SENSOR_TOUCH;
    static EV3GyroSensor EV3_SENSOR_GYRO;
    static EV3ColorSensor EV3_SENSOR_COLOR;
    static EV3UltrasonicSensor EV3_SENSOR_ULTRASONIC;

    static SampleProvider sampleProvider;
    static float[] sample;

    static float val;


    public Main() {
        EV3_SENSOR_TOUCH = new EV3TouchSensor(SensorPort.S1);
        EV3_SENSOR_TOUCH.getTouchMode();
        EV3_SENSOR_GYRO = new EV3GyroSensor(SensorPort.S2);
        EV3_SENSOR_GYRO.getAngleMode();
        EV3_SENSOR_COLOR = new EV3ColorSensor(SensorPort.S3);
        EV3_SENSOR_COLOR.getRedMode();
        EV3_SENSOR_ULTRASONIC = new EV3UltrasonicSensor(SensorPort.S4);
        EV3_SENSOR_ULTRASONIC.getDistanceMode();

        EV3_MOTOR_LEFT = new EV3LargeRegulatedMotor(MotorPort.A);
        EV3_MOTOR_RIGHT = new EV3MediumRegulatedMotor(MotorPort.D);
        EV3_MOTOR_ARM = new EV3LargeRegulatedMotor(MotorPort.B);

        sample = new float[1];
    }

    public static void main(String[] args) {

        while (Button.ESCAPE.isUp()) { // Game loop

            val = get_gyroSensor_value();
            print_val(val);

        }

        close();

    }

    public static void print_String(String string) {

        System.out.println(string);

    }

    public static void print_val(float val) {

        System.out.println(val);

    }

    public static float get_touchSensor_value() {

        EV3_SENSOR_TOUCH.fetchSample(sample, 0);
        float gyroSensor_value = sample[0];
        return gyroSensor_value;

    }

    public static float get_gyroSensor_value() {

        EV3_SENSOR_GYRO.fetchSample(sample, 0);
        float gyroSensor_value = sample[0];
        return gyroSensor_value;

    }

    public static float get_colorSensor_value() {

        EV3_SENSOR_COLOR.fetchSample(sample, 0);
        float colorSensor_value = sample[0];
        return colorSensor_value;

    }

    public static float get_ultrasonicSensor_value() {

        EV3_SENSOR_ULTRASONIC.fetchSample(sample, 0);
        float ultrasonicSensor_value = sample[0];
        return ultrasonicSensor_value;

    }

    public static void close() {

        EV3_SENSOR_TOUCH.close();
        EV3_SENSOR_GYRO.close();
        EV3_SENSOR_COLOR.close();
        EV3_SENSOR_ULTRASONIC.close();

        EV3_MOTOR_LEFT.close();
        EV3_MOTOR_RIGHT.close();
        EV3_MOTOR_ARM.close();

    }

}