diff --git a/demo/java-demo/src/main/java/com/alibaba/demo/basic/DemoInherit.java b/demo/java-demo/src/main/java/com/alibaba/demo/basic/DemoInherit.java
index 3cd8af9..6ca6726 100644
--- a/demo/java-demo/src/main/java/com/alibaba/demo/basic/DemoInherit.java
+++ b/demo/java-demo/src/main/java/com/alibaba/demo/basic/DemoInherit.java
@@ -11,7 +11,7 @@ import com.alibaba.demo.basic.model.mock.Color;
 public class DemoInherit {
 
     /**
-     * call method overridden by sub class via parent class variable
+     * call method overridden by subclass via parent class variable
      */
     public Box putIntoBox() {
         Box box = new BlackBox("");
@@ -20,7 +20,7 @@ public class DemoInherit {
     }
 
     /**
-     * call method overridden by sub class via sub class variable
+     * call method overridden by subclass via subclass variable
      */
     public BlackBox putIntoBlackBox() {
         BlackBox box = new BlackBox("");
@@ -37,7 +37,7 @@ public class DemoInherit {
     }
 
     /**
-     * call method defined in parent class via sub class variable
+     * call method defined in parent class via subclass variable
      */
     public String getFromBlackBox() {
         BlackBox box = new BlackBox("data");
@@ -53,7 +53,7 @@ public class DemoInherit {
     }
 
     /**
-     * call method defined in interface via sub class variable
+     * call method defined in interface via subclass variable
      */
     public String getColorViaBox() {
         BlackBox box = new BlackBox("");
@@ -61,7 +61,7 @@ public class DemoInherit {
     }
 
     /**
-     * call method defined in interface via sub class variable
+     * call method defined in interface via subclass variable
      */
     public String getColorIdxViaColor() {
         Color color = new BlackBox("");
diff --git a/demo/java-demo/src/main/java/com/alibaba/demo/basic/model/mock/Color.java b/demo/java-demo/src/main/java/com/alibaba/demo/basic/model/mock/Color.java
index 8338ddf..96f4847 100644
--- a/demo/java-demo/src/main/java/com/alibaba/demo/basic/model/mock/Color.java
+++ b/demo/java-demo/src/main/java/com/alibaba/demo/basic/model/mock/Color.java
@@ -1,6 +1,6 @@
 package com.alibaba.demo.basic.model.mock;
 
-public interface Color extends BasicColor{
+public interface Color extends BasicColor {
 
     String getColor();
 
diff --git a/demo/kotlin-demo/src/main/kotlin/com/alibaba/demo/basic/DemoInherit.kt b/demo/kotlin-demo/src/main/kotlin/com/alibaba/demo/basic/DemoInherit.kt
index 98df1bc..c960414 100644
--- a/demo/kotlin-demo/src/main/kotlin/com/alibaba/demo/basic/DemoInherit.kt
+++ b/demo/kotlin-demo/src/main/kotlin/com/alibaba/demo/basic/DemoInherit.kt
@@ -11,7 +11,7 @@ import com.alibaba.demo.basic.model.mock.Color
 class DemoInherit {
 
     /**
-     * call method overridden by sub class via parent class variable
+     * call method overridden by subclass via parent class variable
      */
     fun putIntoBox(): Box {
         val box: Box = BlackBox("")
@@ -20,7 +20,7 @@ class DemoInherit {
     }
 
     /**
-     * call method overridden by sub class via sub class variable
+     * call method overridden by subclass via subclass variable
      */
     fun putIntoBlackBox(): BlackBox {
         val box = BlackBox("")
@@ -38,7 +38,7 @@ class DemoInherit {
         }
 
     /**
-     * call method defined in parent class via sub class variable
+     * call method defined in parent class via subclass variable
      */
     val fromBlackBox: String?
         get() {
@@ -56,7 +56,7 @@ class DemoInherit {
         }
 
     /**
-     * call method defined in interface via sub class variable
+     * call method defined in interface via subclass variable
      */
     val colorViaBox: String
         get() {