Checks for overly complicated boolean return statements.

src/main/java/com/alibaba/druid/filter/encoding/CharsetConvert.java

@@ -73,11 +73,7 @@ public class CharsetConvert {
      * @return boolean
      */
     public boolean isEmpty(String s) {
-        if (s == null || "".equals(s)) {
-            return true;
-        } else {
-            return false;
-        }
+        return s == null || "".equals(s);
     }
 
 }

src/main/java/com/alibaba/druid/pool/ha/cobar/CobarFailureDetecter.java

@@ -56,11 +56,7 @@ public class CobarFailureDetecter extends DefaultDataSourceFailureDetecter {
 
             String status = rs.getString(1);
 
-            if ("on".equalsIgnoreCase(status)) {
-                return true;
-            } else {
-                return false;
-            }
+            return "on".equalsIgnoreCase(status);
         } catch (Exception ex) {
             LOG.error("check datasource valid errror", ex);
             return false;