HugeGraph-254: improve utils class perf with final(inline)

Change-Id: I625be2f4691a7821dbf3107d0f28ce079d46dfee

src/main/java/com/baidu/hugegraph/util/CheckSocket.java

@@ -29,7 +29,7 @@ import java.net.Socket;
  *  to keep the JanusGraph distribution self-contained insofar as is
  *  reasonable.
  */
-public class CheckSocket {
+public final class CheckSocket {
 
     public static final int E_USAGE  = 1;
     public static final int E_FAILED = 2;

src/main/java/com/baidu/hugegraph/util/CollectionUtil.java

@@ -5,7 +5,7 @@ import java.util.Collection;
 /**
  * Created by liningrui on 2017/3/30.
  */
-public class CollectionUtil {
+public final class CollectionUtil {
 
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static boolean containsAll(Collection a, Collection b) {

src/main/java/com/baidu/hugegraph/util/E.java

@@ -9,14 +9,15 @@ import com.google.common.base.Preconditions;
 /**
  * Created by liningrui on 2017/5/26.
  */
-public class E {
+public final class E {
 
     public static void checkNotNull(Object object, String elem) {
         Preconditions.checkNotNull(object, "The '%s' can't be null", elem);
     }
 
     public static void checkNotNull(Object object, String elem, String owner) {
-        Preconditions.checkNotNull(object, "The '%s' of '%s' can't be null",
+        Preconditions.checkNotNull(object,
+                                   "The '%s' of '%s' can't be null",
                                    elem, owner);
     }
 

src/main/java/com/baidu/hugegraph/util/HashUtil.java

@@ -7,7 +7,7 @@ import com.google.common.hash.Hashing;
 /**
  * Created by jishilei on 2017/3/26.
  */
-public class HashUtil {
+public final class HashUtil {
 
     public static byte[] hash(byte[] bytes) {
         return Hashing.murmur3_32().hashBytes(bytes).asBytes();

src/main/java/com/baidu/hugegraph/util/LongEncoding.java

@@ -24,7 +24,7 @@ import com.google.common.base.Preconditions;
  * {@linktourl http://stackoverflow.com/questions/2938482/encode-decode-a-long-to-a-string-using-a-fixed-set-of-letters-in-java}
  *
  */
-public class LongEncoding {
+public final class LongEncoding {
 
     private static final String BASE_SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyz";
 

src/main/java/com/baidu/hugegraph/util/ReflectionUtil.java

@@ -17,7 +17,7 @@ import javassist.CtClass;
 import javassist.CtMethod;
 import javassist.NotFoundException;
 
-public class ReflectionUtil {
+public final class ReflectionUtil {
 
     public static List<Method> getMethodsAnnotatedWith(
             Class<?> type,

src/main/java/com/baidu/hugegraph/util/TimeUtil.java

@@ -2,7 +2,7 @@ package com.baidu.hugegraph.util;
 
 import java.util.Date;
 
-public class TimeUtil {
+public final class TimeUtil {
 
     public static long twepoch = 1288834974657L;