demo: mina: Fix PMD warnings

Author: kohlschuetter

junixsocket-demo/src/main/java/org/newsclub/net/unix/demo/mina/MinaTimeServer.java

@@ -19,7 +19,7 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 
 import org.apache.mina.core.service.IoAcceptor;
 import org.apache.mina.core.session.IdleStatus;
@@ -48,7 +48,7 @@ public static void main(String[] args) throws IOException {
 
     acceptor.getFilterChain().addLast("logger", new LoggingFilter());
     acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(
-        Charset.forName("UTF-8"))));
+        StandardCharsets.UTF_8)));
     acceptor.setHandler(new TimeServerHandler());
     acceptor.getSessionConfig().setReadBufferSize(2048);
     acceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);

junixsocket-demo/src/main/java/org/newsclub/net/unix/demo/mina/TimeServerHandler.java

@@ -39,7 +39,7 @@ public void exceptionCaught(IoSession session, Throwable cause) throws Exception
   @Override
   public void messageReceived(IoSession session, Object message) throws Exception {
     String str = message.toString();
-    if (str.trim().equalsIgnoreCase("quit")) {
+    if ("quit".equalsIgnoreCase(str.trim())) {
       session.closeNow();
       return;
     }