fixed some warnings

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java

@@ -287,7 +287,7 @@ public class CdcAcmSerialDriver implements UsbSerialDriver {
     }
 
     public static Map<Integer, int[]> getSupportedDevices() {
-        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
+        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
         supportedDevices.put(UsbId.VENDOR_ARDUINO,
                 new int[] {
                         UsbId.ARDUINO_UNO,

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Ch34xSerialDriver.java

@@ -363,7 +363,7 @@ public class Ch34xSerialDriver implements UsbSerialDriver {
 	}
 
 	public static Map<Integer, int[]> getSupportedDevices() {
-		final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
+		final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
 		supportedDevices.put(UsbId.VENDOR_QINHENG, new int[]{
 				UsbId.QINHENG_CH340,
 				UsbId.QINHENG_CH341A,

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/Cp21xxSerialDriver.java

@@ -322,7 +322,7 @@ public class Cp21xxSerialDriver implements UsbSerialDriver {
     }
 
     public static Map<Integer, int[]> getSupportedDevices() {
-        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
+        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
         supportedDevices.put(UsbId.VENDOR_SILABS,
                 new int[] {
             UsbId.SILABS_CP2102, // same ID for CP2101, CP2103, CP2104, CP2109

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/FtdiSerialDriver.java

@@ -415,7 +415,7 @@ public class FtdiSerialDriver implements UsbSerialDriver {
     }
 
     public static Map<Integer, int[]> getSupportedDevices() {
-        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
+        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
         supportedDevices.put(UsbId.VENDOR_FTDI,
                 new int[] {
                     UsbId.FTDI_FT232R,

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProbeTable.java

@@ -21,7 +21,7 @@ import java.util.Map;
 public class ProbeTable {
 
     private final Map<Pair<Integer, Integer>, Class<? extends UsbSerialDriver>> mProbeTable =
-            new LinkedHashMap<Pair<Integer,Integer>, Class<? extends UsbSerialDriver>>();
+            new LinkedHashMap<>();
 
     /**
      * Adds or updates a (vendor, product) pair in the table.

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProlificSerialDriver.java

@@ -35,7 +35,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
             28800, 38400, 57600, 115200, 128000, 134400, 161280, 201600, 230400, 268800,
             403200, 460800, 614400, 806400, 921600, 1228800, 2457600, 3000000, 6000000
     };
-    private enum DeviceType { DEVICE_TYPE_01, DEVICE_TYPE_HX};
+    private enum DeviceType { DEVICE_TYPE_01, DEVICE_TYPE_HX}
 
     private final UsbDevice mDevice;
     private final UsbSerialPort mPort;
@@ -502,7 +502,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
     }
 
     public static Map<Integer, int[]> getSupportedDevices() {
-        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<Integer, int[]>();
+        final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
         supportedDevices.put(UsbId.VENDOR_PROLIFIC,
                 new int[] { UsbId.PROLIFIC_PL2303, });
         return supportedDevices;

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbSerialProber.java

@@ -46,11 +46,11 @@ public class UsbSerialProber {
      * not require permission from the Android USB system, since it does not
      * open any of the devices.
      *
-     * @param usbManager
+     * @param usbManager usb manager
      * @return a list, possibly empty, of all compatible drivers
      */
     public List<UsbSerialDriver> findAllDrivers(final UsbManager usbManager) {
-        final List<UsbSerialDriver> result = new ArrayList<UsbSerialDriver>();
+        final List<UsbSerialDriver> result = new ArrayList<>();
 
         for (final UsbDevice usbDevice : usbManager.getDeviceList().values()) {
             final UsbSerialDriver driver = probeDevice(usbDevice);

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/util/SerialInputOutputManager.java

@@ -52,12 +52,12 @@ public class SerialInputOutputManager implements Runnable {
         /**
          * Called when new incoming data is available.
          */
-        public void onNewData(byte[] data);
+        void onNewData(byte[] data);
 
         /**
          * Called when {@link SerialInputOutputManager#run()} aborts due to an error.
          */
-        public void onRunError(Exception e);
+        void onRunError(Exception e);
     }
 
     public SerialInputOutputManager(UsbSerialPort serialPort) {
@@ -200,7 +200,7 @@ public class SerialInputOutputManager implements Runnable {
 
     private void step() throws IOException {
         // Handle incoming data.
-        byte[] buffer = null;
+        byte[] buffer;
         synchronized (mReadBufferLock) {
             buffer = mReadBuffer.array();
         }