diff --git a/src/main/java/haidnor/jvm/instruction/references/INVOKEVIRTUAL.java b/src/main/java/haidnor/jvm/instruction/references/INVOKEVIRTUAL.java
index b23fd53..281d263 100644
--- a/src/main/java/haidnor/jvm/instruction/references/INVOKEVIRTUAL.java
+++ b/src/main/java/haidnor/jvm/instruction/references/INVOKEVIRTUAL.java
@@ -87,9 +87,10 @@ public class INVOKEVIRTUAL extends Instruction {
                 javaClass = klass.getJavaClass();
             }
 
+            // 按照继承关系从下往上找实现的方法 (实现多态)
             org.apache.bcel.classfile.Method method = getMethod(javaClass, methodSignature, methodName);
             if (method == null) {
-                throw new NoSuchMethodException();
+                throw new AbstractMethodError();
             }
             KlassMethod klassMethod = new KlassMethod(klass, method);
             JavaExecutionEngine.callMethod(frame, klassMethod);
diff --git a/src/test/java/haidnor/jvm/test/clazz/Baby.java b/src/test/java/haidnor/jvm/test/clazz/Baby.java
deleted file mode 100644
index 7deb2ab..0000000
--- a/src/test/java/haidnor/jvm/test/clazz/Baby.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package haidnor.jvm.test.clazz;
-
-public class Baby {
-    public void eat() {
-        System.out.println("婴儿吃奶粉");
-    }
-}
diff --git a/src/test/java/haidnor/jvm/test/clazz/Human.java b/src/test/java/haidnor/jvm/test/clazz/Human.java
new file mode 100644
index 0000000..301fe8e
--- /dev/null
+++ b/src/test/java/haidnor/jvm/test/clazz/Human.java
@@ -0,0 +1,7 @@
+package haidnor.jvm.test.clazz;
+
+public class Human {
+    public void eat() {
+        System.out.println("人类吃饭");
+    }
+}
diff --git a/src/test/java/haidnor/jvm/test/clazz/Person.java b/src/test/java/haidnor/jvm/test/clazz/Person.java
deleted file mode 100644
index 195865f..0000000
--- a/src/test/java/haidnor/jvm/test/clazz/Person.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package haidnor.jvm.test.clazz;
-
-public interface Person {
-
-    void eat();
-
-}
diff --git a/src/test/java/haidnor/jvm/test/clazz/Student.java b/src/test/java/haidnor/jvm/test/clazz/Student.java
index 98a377e..3c674ef 100644
--- a/src/test/java/haidnor/jvm/test/clazz/Student.java
+++ b/src/test/java/haidnor/jvm/test/clazz/Student.java
@@ -1,15 +1,5 @@
 package haidnor.jvm.test.clazz;
 
-public class Student extends Baby{
-
-    private int age;
-
-    public int getAge() {
-        return age;
-    }
-
-    public void setAge(int age) {
-        this.age = age;
-    }
+public class Student extends Human {
 
 }