java: added some of the missing samples

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@gmail.com>
Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

examples/java/MQ8Sample.java

@@ -0,0 +1,56 @@
+/*
+ * Author: Stefan Andritoiu <stefan.andritoiu@gmail.com>
+ * Copyright (c) 2017 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+public class MQ8Sample {
+
+	public static void main(String[] args) throws InterruptedException {
+		// ! [Interesting]
+		short[] buffer = new short[128];
+
+		// Attach gas sensor to A0
+		upm_gas.MQ8 sensor = new upm_gas.MQ8(0);
+
+		upm_gas.thresholdContext ctx = new upm_gas.thresholdContext();
+		ctx.setAverageReading(0);
+		ctx.setRunningAverage(0);
+		ctx.setAveragedOver(2);
+
+		// Infinite loop, ends when script is cancelled
+		// Repeatedly, take a sample every 2 microseconds;
+		// find the average of 128 samples; and
+		// print a running graph of asterisks as averages
+		while (true) {
+			int len = sensor.getSampledWindow(2, buffer);
+
+			if (len != 0) {
+				int thresh = sensor.findThreshold(ctx, 30, buffer);
+				sensor.printGraph(ctx, (short) 5);
+				if (thresh != 0) {
+					// do something...
+				}
+			}
+		}
+		// ! [Interesting]
+	}
+}