diff --git a/core/src/main/java/com/taobao/arthas/core/util/Decompiler.java b/core/src/main/java/com/taobao/arthas/core/util/Decompiler.java
index e6837121f..993c2c339 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/Decompiler.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/Decompiler.java
@@ -85,14 +85,16 @@ public class Decompiler {
             path = classFileSource.adjustInputPath(path);
 
             AnalysisType type = (AnalysisType) options.getOption(OptionsImpl.ANALYSE_AS);
-            if (type == null)
+            if (type == null) {
                 type = dcCommonState.detectClsJar(path);
+            }
 
             if (type == AnalysisType.JAR) {
                 // doJar(dcCommonState, path, dumperFactory);
             }
-            if (type == AnalysisType.CLASS)
+            if (type == AnalysisType.CLASS) {
                 result.append(doClass(dcCommonState, path, skipInnerClass, dumperFactory));
+            }
         }
         return result.toString();
     }
@@ -105,8 +107,9 @@ public class Decompiler {
         Dumper d = new ToStringDumper();
         try {
             ClassFile c = dcCommonState.getClassFileMaybePath(path);
-            if ((skipInnerClass) && (c.isInnerClass()))
+            if ((skipInnerClass) && (c.isInnerClass())) {
                 return "";
+            }
             dcCommonState.configureWith(c);
             dumperFactory.getProgressDumper().analysingType(c.getClassType());
             try {
@@ -132,12 +135,14 @@ public class Decompiler {
             // collectingDumper.getTypeUsageInformation(), illegalIdentifierDump);
 
             String methname = (String) options.getOption(OptionsImpl.METHODNAME);
-            if (methname == null)
+            if (methname == null) {
                 c.dump(d);
+            }
             else {
                 try {
-                    for (Method method : c.getMethodByName(methname))
+                    for (Method method : c.getMethodByName(methname)) {
                         method.dump(d, true);
+                    }
                 } catch (NoSuchMethodException e) {
                     throw new IllegalArgumentException("No such method '" + methname + "'.");
                 }
@@ -146,18 +151,21 @@ public class Decompiler {
             result.append(d.toString());
         } catch (ConfusedCFRException e) {
             result.append(e.toString()).append("\n");
-            for (Object x : e.getStackTrace())
+            for (Object x : e.getStackTrace()) {
                 result.append(x).append("\n");
+            }
         } catch (CannotLoadClassException e) {
             result.append("Can't load the class specified:").append("\n");
             result.append(e.toString()).append("\n");
         } catch (RuntimeException e) {
             result.append(e.toString()).append("\n");
-            for (Object x : e.getStackTrace())
+            for (Object x : e.getStackTrace()) {
                 result.append(x).append("\n");
+            }
         } finally {
-            if (d != null)
+            if (d != null) {
                 d.close();
+            }
         }
         return result.toString();
     }
diff --git a/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java b/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
index 535b63bb7..f01a6055f 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/NetUtils.java
@@ -191,12 +191,13 @@ public class NetUtils {
         } catch (Exception e) {
             return false;
         } finally {
-            if (s != null)
+            if (s != null) {
                 try {
                     s.close();
                 } catch (Exception e) {
                     // ignore
                 }
+            }
         }
     }
 
diff --git a/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java b/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
index 9774e41f8..bb028fa11 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/StringUtils.java
@@ -871,7 +871,9 @@ public abstract class StringUtils {
     }
 
     public static String classLoaderHash(Class<?> clazz) {
-        if (clazz == null || clazz.getClassLoader() == null) return "null";
+        if (clazz == null || clazz.getClassLoader() == null) {
+            return "null";
+        }
         return Integer.toHexString(clazz.getClassLoader().hashCode());
     }
 
@@ -881,7 +883,9 @@ public abstract class StringUtils {
      * @return  human readable format
      */
     public static String humanReadableByteCount(long bytes) {
-        if (bytes < UNIT) return bytes + " B";
+        if (bytes < UNIT) {
+            return bytes + " B";
+        }
         int exp = (int) (Math.log(bytes) / Math.log(UNIT));
         String pre =  STRING_UNITS.charAt(exp-1) +  "i";
         return String.format("%.2f %sB", bytes / Math.pow(UNIT, exp), pre);
diff --git a/core/src/main/java/com/taobao/arthas/core/view/Ansi.java b/core/src/main/java/com/taobao/arthas/core/view/Ansi.java
index 91bc951d9..481b7d999 100644
--- a/core/src/main/java/com/taobao/arthas/core/view/Ansi.java
+++ b/core/src/main/java/com/taobao/arthas/core/view/Ansi.java
@@ -136,7 +136,9 @@ public class Ansi {
     };
 
     public static void setDetector(final Callable<Boolean> detector) {
-        if (detector == null) throw new IllegalArgumentException();
+        if (detector == null) {
+            throw new IllegalArgumentException();
+        }
         Ansi.detector = detector;
     }
 
@@ -698,8 +700,9 @@ public class Ansi {
     }
 
     private void flushAttributes() {
-        if (attributeOptions.isEmpty())
+        if (attributeOptions.isEmpty()) {
             return;
+        }
         if (attributeOptions.size() == 1 && attributeOptions.get(0) == 0) {
             builder.append(FIRST_ESC_CHAR);
             builder.append(SECOND_ESC_CHAR);