optimize some code styles

dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/merger/ResultMergerTest.java

@@ -290,11 +290,11 @@ public void testMapArrayMerger() {
      */
     @Test
     public void testLongArrayMerger() {
-        long[] arrayOne = {1l, 2l};
-        long[] arrayTwo = {2l, 34l};
+        long[] arrayOne = {1L, 2L};
+        long[] arrayTwo = {2L, 34L};
         long[] result = MergerFactory.getMerger(long[].class).merge(arrayOne, arrayTwo, null);
         Assertions.assertEquals(4, result.length);
-        double[] mergedResult = {1l, 2l, 2l, 34l};
+        double[] mergedResult = {1L, 2L, 2L, 34L};
         for (int i = 0; i < mergedResult.length; i++) {
             Assertions.assertEquals(mergedResult[i], result[i], 0.0);
         }

dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/support/AbstractClusterInvokerTest.java

@@ -445,7 +445,6 @@ public void testSelectBalance() {
         }
 
         Assertions.assertEquals(runs, counter.get(invoker2).get() + counter.get(invoker4).get());
-        ;
 
     }
 

dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/support/FailoverClusterInvokerTest.java

@@ -203,7 +203,7 @@ public Object call() throws Exception {
         clusterinvoker.invoke(inv);
     }
 
-    public static interface Demo {
+    public interface Demo {
     }
 
     public static class MockInvoker<T> extends AbstractInvoker<T> {

dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/support/MenuService.java

@@ -20,8 +20,8 @@
 
 public interface MenuService {
 
-    public Menu getMenu();
+    Menu getMenu();
 
-    public void addMenu(String menu, List<String> items);
+    void addMenu(String menu, List<String> items);
 
 }

dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/support/wrapper/MockClusterInvokerTest.java

@@ -673,7 +673,7 @@ private Invoker<IHelloService> getClusterInvoker(URL url) {
         return getClusterInvokerMock(url, null);
     }
 
-    public static interface IHelloService {
+    public interface IHelloService {
         String getSomething();
 
         String getSomething2();
@@ -686,9 +686,9 @@ public static interface IHelloService {
 
         Boolean getBoolean2();
 
-        public List<String> getListString();
+        List<String> getListString();
 
-        public List<User> getUsers();
+        List<User> getUsers();
 
         void sayHello();
     }

dubbo-common/src/main/java/org/apache/dubbo/common/constants/CommonConstants.java

@@ -44,9 +44,9 @@ public interface CommonConstants {
 
     Pattern COMMA_SPLIT_PATTERN = Pattern.compile("\\s*[,]+\\s*");
 
-    public final static String PATH_SEPARATOR = "/";
+    String PATH_SEPARATOR = "/";
 
-    public final static String PROTOCOL_SEPARATOR = "://";
+    String PROTOCOL_SEPARATOR = "://";
 
     String REGISTRY_SEPARATOR = "|";
 

dubbo-common/src/main/java/org/apache/dubbo/common/json/JSONVisitor.java

@@ -21,7 +21,7 @@
  */
 @Deprecated
 public interface JSONVisitor {
-    public static final String CLASS_PROPERTY = "class";
+    String CLASS_PROPERTY = "class";
 
     /**
      * parse begin .

dubbo-common/src/test/java/org/apache/dubbo/common/bytecode/ProxyTest.java

@@ -62,7 +62,7 @@ public void testCglibProxy() throws Exception {
         }
     }
 
-    public static interface ITest {
+    public interface ITest {
         String getName();
 
         void setName(String name, String name2);

dubbo-common/src/test/java/org/apache/dubbo/common/bytecode/WrapperTest.java

@@ -131,11 +131,11 @@ public void test_getMethodNames_ContainExtendsParentMethods() throws Exception {
         assertArrayEquals(new String[]{"hello", "world"}, Wrapper.getWrapper(Son.class).getMethodNames());
     }
 
-    public static interface I0 {
+    public interface I0 {
         String getName();
     }
 
-    public static interface I1 extends I0 {
+    public interface I1 extends I0 {
         void setName(String name);
 
         void hello(String name);
@@ -147,19 +147,19 @@ public static interface I1 extends I0 {
         void setFloat(float f);
     }
 
-    public static interface EmptyService {
+    public interface EmptyService {
     }
 
-    public static interface Parent1 {
+    public interface Parent1 {
         void hello();
     }
 
 
-    public static interface Parent2 {
+    public interface Parent2 {
         void world();
     }
 
-    public static interface Son extends Parent1, Parent2 {
+    public interface Son extends Parent1, Parent2 {
 
     }
 

dubbo-common/src/test/java/org/apache/dubbo/common/extension/ext6_inject/Dao.java

@@ -18,5 +18,5 @@
 package org.apache.dubbo.common.extension.ext6_inject;
 
 public interface Dao {
-    public void update();
+    void update();
 }

dubbo-common/src/test/java/org/apache/dubbo/common/utils/IOUtilsTest.java

@@ -32,6 +32,7 @@
 import java.io.StringReader;
 import java.io.StringWriter;
 import java.io.Writer;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
 
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -47,7 +48,7 @@ public class IOUtilsTest {
 
     @BeforeEach
     public void setUp() throws Exception {
-        is = new ByteArrayInputStream(TEXT.getBytes("UTF-8"));
+        is = new ByteArrayInputStream(TEXT.getBytes(StandardCharsets.UTF_8));
         os = new ByteArrayOutputStream();
         reader = new StringReader(TEXT);
         writer = new StringWriter();

dubbo-common/src/test/java/org/apache/dubbo/common/utils/ReflectUtilsTest.java

@@ -420,7 +420,7 @@ public void testGetReturnTypes () throws Exception{
         Assertions.assertEquals("java.util.List<java.lang.String>", types2[1].getTypeName());
     }
 
-    public static interface TypeClass {
+    public interface TypeClass {
 
         CompletableFuture<String> getFuture();
 

dubbo-compatible/src/test/java/org/apache/dubbo/service/ComplexObject.java

@@ -169,7 +169,7 @@ public int hashCode() {
         return result;
     }
 
-    static public enum TestEnum {
+    public enum TestEnum {
         VALUE1, VALUE2
     }
 

dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/utils/ReferenceConfigCache.java

@@ -162,7 +162,7 @@ public String toString() {
                 + ")";
     }
 
-    public static interface KeyGenerator {
+    public interface KeyGenerator {
         String generateKey(ReferenceConfig<?> referenceConfig);
     }
 }

dubbo-filter/dubbo-filter-validation/src/test/java/org/apache/dubbo/validation/support/jvalidation/mock/JValidatorTestTarget.java

@@ -24,16 +24,16 @@
 
 public interface JValidatorTestTarget {
     @MethodValidated
-    public void someMethod1(String anything);
+    void someMethod1(String anything);
 
     @MethodValidated(Test2.class)
-    public void someMethod2(@NotNull ValidationParameter validationParameter);
+    void someMethod2(@NotNull ValidationParameter validationParameter);
 
-    public void someMethod3(ValidationParameter[] parameters);
+    void someMethod3(ValidationParameter[] parameters);
 
-    public void someMethod4(List<String> strings);
+    void someMethod4(List<String> strings);
 
-    public void someMethod5(Map<String, String> map);
+    void someMethod5(Map<String, String> map);
 
     @interface Test2 {
     }

dubbo-metadata-report/dubbo-metadata-definition/src/test/java/org/apache/dubbo/metadata/definition/common/ColorEnum.java

@@ -18,5 +18,5 @@
 
 public enum ColorEnum {
 
-    RED, YELLOW, BLUE;
+    RED, YELLOW, BLUE
 }

dubbo-metadata-report/dubbo-metadata-definition/src/test/java/org/apache/dubbo/metadata/definition/service/ComplexObject.java

@@ -170,7 +170,7 @@ public int hashCode() {
         return result;
     }
 
-    static public enum TestEnum {
+    public enum TestEnum {
         VALUE1, VALUE2
     }
 

dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/identifier/MetadataIdentifier.java

@@ -127,7 +127,7 @@ public void setApplication(String application) {
         this.application = application;
     }
 
-    public static enum KeyTypeEnum {
+    public enum KeyTypeEnum {
         PATH, UNIQUE_KEY
     }
 }

dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/support/AbstractMetadataReport.java

@@ -23,6 +23,7 @@
 import org.apache.dubbo.common.utils.NamedThreadFactory;
 import org.apache.dubbo.metadata.definition.model.FullServiceDefinition;
 import org.apache.dubbo.metadata.identifier.MetadataIdentifier;
+import org.apache.dubbo.metadata.identifier.MetadataIdentifier.KeyTypeEnum;
 import org.apache.dubbo.metadata.store.MetadataReport;
 
 import com.google.gson.Gson;
@@ -190,9 +191,9 @@ private void saveProperties(MetadataIdentifier metadataIdentifier, String value,
 
         try {
             if (add) {
-                properties.setProperty(metadataIdentifier.getUniqueKey(MetadataIdentifier.KeyTypeEnum.UNIQUE_KEY), value);
+                properties.setProperty(metadataIdentifier.getUniqueKey(KeyTypeEnum.UNIQUE_KEY), value);
             } else {
-                properties.remove(metadataIdentifier.getUniqueKey(MetadataIdentifier.KeyTypeEnum.UNIQUE_KEY));
+                properties.remove(metadataIdentifier.getUniqueKey(KeyTypeEnum.UNIQUE_KEY));
             }
             long version = lastCacheChanged.incrementAndGet();
             if (sync) {

dubbo-metadata-report/dubbo-metadata-report-api/src/test/java/org/apache/dubbo/metadata/identifier/MetadataIdentifierTest.java

@@ -16,6 +16,7 @@
  */
 package org.apache.dubbo.metadata.identifier;
 
+import org.apache.dubbo.metadata.identifier.MetadataIdentifier.KeyTypeEnum;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -34,12 +35,12 @@ public void testGetUniqueKey() {
         String group = null;
         String application = "vic.zk.md";
         MetadataIdentifier providerMetadataIdentifier = new MetadataIdentifier(interfaceName, version, group, PROVIDER_SIDE, application);
-        Assertions.assertEquals(providerMetadataIdentifier.getUniqueKey(MetadataIdentifier.KeyTypeEnum.PATH),
+        Assertions.assertEquals(providerMetadataIdentifier.getUniqueKey(KeyTypeEnum.PATH),
                 "metadata" + PATH_SEPARATOR + interfaceName + PATH_SEPARATOR +
                         (version == null ? "" : (version + PATH_SEPARATOR))
                 + (group == null ? "" : (group + PATH_SEPARATOR)) + PROVIDER_SIDE
                         + PATH_SEPARATOR + application);
-        Assertions.assertEquals(providerMetadataIdentifier.getUniqueKey(MetadataIdentifier.KeyTypeEnum.UNIQUE_KEY),
+        Assertions.assertEquals(providerMetadataIdentifier.getUniqueKey(KeyTypeEnum.UNIQUE_KEY),
                 interfaceName + MetadataIdentifier.SEPARATOR +
                         (version == null ? "" : version + MetadataIdentifier.SEPARATOR)
                         + (group == null ? "" : group + MetadataIdentifier.SEPARATOR)

dubbo-metadata-report/dubbo-metadata-report-api/src/test/java/org/apache/dubbo/metadata/integration/InterfaceNameTestService2.java

@@ -21,5 +21,5 @@
  */
 public interface InterfaceNameTestService2 {
 
-    public void test2();
+    void test2();
 }

dubbo-registry/dubbo-registry-api/src/test/java/org/apache/dubbo/registry/ZKTools.java

@@ -30,6 +30,7 @@
 import org.apache.curator.framework.recipes.cache.TreeCacheListener;
 import org.apache.curator.retry.ExponentialBackoffRetry;
 
+import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -233,7 +234,7 @@ public void childEvent(CuratorFramework client, TreeCacheEvent event) throws Exc
 
                 if (data.getPath().split("/").length == 5) {
                     byte[] value = data.getData();
-                    String stringValue = new String(value, "utf-8");
+                    String stringValue = new String(value, StandardCharsets.UTF_8);
 
                     // fire event to all listeners
                     Map<String, Object> added = null;

dubbo-registry/dubbo-registry-api/src/test/java/org/apache/dubbo/registry/support/FailbackRegistryTest.java

@@ -164,7 +164,7 @@ public void testDoRetry_nofify() throws Exception {
             public void notify(List<URL> urls) {
                 count.incrementAndGet();
                 //The exception is thrown for the first time to see if the back will be called again to incrementAndGet
-                if (count.get() == 1l) {
+                if (count.get() == 1L) {
                     throw new RuntimeException("test exception please ignore");
                 }
             }

dubbo-registry/dubbo-registry-default/src/test/java/org/apache/dubbo/registry/dubbo/RegistryDirectoryTest.java

@@ -495,8 +495,6 @@ public void testDubbo1UrlWithGenericInvocation() {
 
     }
 
-    ;
-
     /**
      * When the first arg of a method is String or Enum, Registry server can do parameter-value-based routing.
      */
@@ -1083,7 +1081,7 @@ enum Param {
         MORGAN,
     }
 
-    private static interface DemoService {
+    private interface DemoService {
     }
 
     private static class MockRegistry implements Registry {

dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/buffer/ChannelBuffer.java

@@ -275,7 +275,7 @@ public interface ChannelBuffer extends Comparable<ChannelBuffer> {
      * not an instance of {@link ChannelBuffer} type.
      */
     @Override
-    public boolean equals(Object o);
+    boolean equals(Object o);
 
     /**
      * Returns the factory which creates a {@link ChannelBuffer} whose type and

dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/RpcMessageHandler.java

@@ -69,7 +69,7 @@ public Object reply(ExchangeChannel channel, RpcMessage msg) throws RemotingExce
 
     }
 
-    public static interface ServiceProvider {
+    public interface ServiceProvider {
         Object getImplementation(String service);
     }
 

dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/codec/ExchangeCodecTest.java

@@ -350,7 +350,7 @@ public void test_Encode_Response() throws IOException {
         Channel channel = getCliendSideChannel(url);
         Response response = new Response();
         response.setHeartbeat(true);
-        response.setId(1001l);
+        response.setId(1001L);
         response.setStatus((byte) 20);
         response.setVersion("11");
         Person person = new Person();
@@ -379,7 +379,7 @@ public void test_Encode_Error_Response() throws IOException {
         Channel channel = getCliendSideChannel(url);
         Response response = new Response();
         response.setHeartbeat(true);
-        response.setId(1001l);
+        response.setId(1001L);
         response.setStatus((byte) 10);
         response.setVersion("11");
         String badString = "bad";

dubbo-remoting/dubbo-remoting-api/src/test/java/org/apache/dubbo/remoting/handler/WrappedChannelHandlerTest.java

@@ -83,8 +83,6 @@ public void test_Connect_Biz_Error() throws RemotingException {
         Assertions.assertThrows(RemotingException.class, () -> handler.connected(new MockedChannel()));
     }
 
-    ;
-
     @Test
     public void test_Disconnect_Biz_Error() throws RemotingException {
         Assertions.assertThrows(RemotingException.class, () -> handler.disconnected(new MockedChannel()));

dubbo-remoting/dubbo-remoting-etcd3/src/main/java/org/apache/dubbo/remoting/etcd/EtcdClient.java

@@ -154,7 +154,7 @@ public interface EtcdClient {
      * @throws TimeoutException if the wait timed out
      * @return lease id from etcd
      */
-    public long createLease(long ttl, long timeout, TimeUnit unit)
+    long createLease(long ttl, long timeout, TimeUnit unit)
             throws InterruptedException, ExecutionException, TimeoutException;
 
     /**

dubbo-remoting/dubbo-remoting-etcd3/src/main/java/org/apache/dubbo/remoting/etcd/RetryPolicy.java

@@ -26,6 +26,6 @@ public interface RetryPolicy {
      * @param sleep   should be sleep
      * @return true should be retry
      */
-    public boolean shouldRetry(int retried, long elapsed, boolean sleep);
+    boolean shouldRetry(int retried, long elapsed, boolean sleep);
 
 }

dubbo-remoting/dubbo-remoting-zookeeper/src/test/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClientTest.java

@@ -188,8 +188,8 @@ public void childEvent(CuratorFramework client, TreeCacheEvent event) throws Exc
         curatorClient.delete(path);
         valueFromCache = curatorClient.getContent(path + "/d.json");
         Assertions.assertNull(valueFromCache);
-        Thread.sleep(2000l);
-        Assertions.assertTrue(9l >= atomicInteger.get());
-        Assertions.assertTrue(2l <= atomicInteger.get());
+        Thread.sleep(2000L);
+        Assertions.assertTrue(9L >= atomicInteger.get());
+        Assertions.assertTrue(2L <= atomicInteger.get());
     }
 }