java: added examples and solved some issues with the naming convention

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@intel.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/java/GroveButtonSample.java

@@ -0,0 +1,23 @@
+public class GroveButtonSample{
+
+	static {
+		try {
+			System.loadLibrary("javaupm_grove");
+		}catch (UnsatisfiedLinkError e) {
+			System.err.println("error in loading native library");
+			System.exit(-1);
+		}
+	}
+	
+	public static void main(String[] args) throws InterruptedException {
+		// Create the button object using UART
+		upm_grove.GroveButton button = new upm_grove.GroveButton(0);
+	
+		while (true) {
+			System.out.println(button.name() +" value is " + button.value());
+			
+			Thread.sleep(1000);
+		}
+	}
+
+}