diff --git a/src/main/java/io/github/tanyaofei/beancopier/ConverterCodeWriter.java b/src/main/java/io/github/tanyaofei/beancopier/ConverterCodeWriter.java
index 28280b2..704ae70 100644
--- a/src/main/java/io/github/tanyaofei/beancopier/ConverterCodeWriter.java
+++ b/src/main/java/io/github/tanyaofei/beancopier/ConverterCodeWriter.java
@@ -95,7 +95,7 @@ private void writeConvertMethod(ClassWriter cw) {
 
     v.visitCode();
 
-    CodeEmitter.newInstanceViaNoArgsConstructor(v, tc);
+    CodeEmitter.newInstance(v, tc);
     v.visitVarInsn(ASTORE, 2);
     Label jumpHere = null;
     Iterable<BeanProperty> setters = Reflections.getBeanSetters(tc, configuration.isIncludingSuper());
@@ -133,7 +133,7 @@ private void writeConvertMethod(ClassWriter cw) {
         jumpHere = skipNull(v, getter);
         nestedCollectionCopy(v, getter, setter);
         hasNestedCollectionCopy = true;
-      } else if (isCompatible(sf, tf)) {
+      } else if (configuration.isFullTypeMatching() ? isTypeEquals(sf, tf) : isCompatible(sf, tf)) {
         if (jumpHere != null) {
           v.visitLabel(jumpHere);
         }
@@ -188,7 +188,7 @@ private void writeConvertBridgeMethod(
   /**
    * 编写用于集合嵌套拷贝避免空指针错误的 lambda 方法
    * <pre>{@code
-   * (Function)(varx1) -> {return varx1 == null ? null : this.convert(varx1);};
+   * (Function)(v) -> {return v == null ? null : this.convert(v);};
    * }</pre>
    *
    * @param cw ClassWriter
@@ -229,12 +229,21 @@ private void writeConvertBridgeMethod(
    *
    * @param sf 来源字段
    * @param tf 目标字段
-   * @return 如果配置了全类型匹配，则严格判断两者的类型是否完全一致；否则会根据 JAVA 的规范判断是否兼容
+   * @return 两个字段类型是否兼容
    */
   private boolean isCompatible(Field sf, Field tf) {
-    return configuration.isFullTypeMatching()
-        ? sf.getGenericType().equals(tf.getGenericType())
-        : TypeToken.of(sf.getGenericType()).isSubtypeOf(tf.getGenericType());
+    return TypeToken.of(sf.getGenericType()).isSubtypeOf(tf.getGenericType());
+  }
+
+  /**
+   * 判断类型是否相同
+   *
+   * @param sf 来源字段
+   * @param tf 目标字段
+   * @return 两个字段的类型是否相同
+   */
+  private boolean isTypeEquals(Field sf, Field tf) {
+    return sf.getGenericType().equals(tf.getGenericType());
   }
 
   /**
@@ -262,6 +271,9 @@ && getCollectionElementType(sf) == sc
 
   /**
    * 集合嵌套拷贝
+   * <pre>{@code
+   * target.setValue(source.getValue().stream(v -> v == null ? null : this.convert(v)));
+   * }</pre>
    *
    * @param v      MethodVisitor
    * @param getter 来源字段的 getter 方法
@@ -275,14 +287,14 @@ private void nestedCollectionCopy(
     String methodDescriptor = CodeEmitter.getMethodDescriptor(tc, sc);
     v.visitVarInsn(ALOAD, 2);
 
-    // this.getField()
+    // this.getValue()
     v.visitVarInsn(ALOAD, 1);
     CodeEmitter.invokeMethod(v, INVOKEVIRTUAL, getter);
 
     // list.stream()
     CodeEmitter.invokeMethod(v, INVOKEINTERFACE, LIST$STREAM);
 
-    // (o) -> o == null ? null : this.convert(o)
+    // (v) -> v == null ? null : this.convert(v)
     v.visitVarInsn(ALOAD, 0);
     v.visitInvokeDynamicInsn(
         FUNCTION$APPLY.getName(),
@@ -322,7 +334,7 @@ private void nestedCollectionCopy(
   /**
    * 类型兼容拷贝
    * <pre>{@code
-   * var2.setValue(var1.getValue());
+   * target.setValue(source.getValue());
    * }</pre>
    *
    * @param v      MethodVisit
@@ -372,13 +384,15 @@ private Label skipNull(MethodVisitor v, Method getter) {
 
   /**
    * 嵌套拷贝
+   * <pre>{@code
+   * target.setValue(this.convert(source.getValue()));
+   * }</pre>
    *
    * @param v      MethodVisitor
    * @param getter 来源字段的 getter 方法
    * @param setter 来源字段的 setter 方法
    */
   private void nestedCopy(MethodVisitor v, Method getter, Method setter) {
-    // target.setField(convert(source.getField()))
     v.visitVarInsn(ALOAD, 2);
     v.visitVarInsn(ALOAD, 0);
     v.visitVarInsn(ALOAD, 1);
diff --git a/src/main/java/io/github/tanyaofei/beancopier/ConverterFactory.java b/src/main/java/io/github/tanyaofei/beancopier/ConverterFactory.java
index 881723b..b2988da 100644
--- a/src/main/java/io/github/tanyaofei/beancopier/ConverterFactory.java
+++ b/src/main/java/io/github/tanyaofei/beancopier/ConverterFactory.java
@@ -36,7 +36,7 @@ class ConverterFactory implements Opcodes, MethodConstants {
   /**
    * 每个 classloader 已经注册的类名
    */
-  private final static WeakHashMap<ClassLoader, Set<String>> classNames = new WeakHashMap<>(4);
+  private final static WeakHashMap<ClassLoader, Set<String>> reservedClassNames = new WeakHashMap<>(4);
 
   private final ConverterConfiguration configuration;
 
@@ -101,6 +101,16 @@ private static void dumpClass(byte[] code, String filename) {
     }
   }
 
+  private static Set<String> getReservedClassNames(ClassLoader cl) {
+    Set<String> names = reservedClassNames.get(cl);
+    if (names == null) {
+      synchronized (reservedClassNames) {
+        names = reservedClassNames.computeIfAbsent(cl, k -> new HashSet<>(32));
+      }
+    }
+    return names;
+  }
+
   /**
    * 创建 sc 拷贝为 tc 的转换器并加载到运行时内存中并创建实例
    *
@@ -108,7 +118,9 @@ private static void dumpClass(byte[] code, String filename) {
    * @param tc  拷贝目标类
    * @param <S> 拷贝来源
    * @param <T> 拷贝目标
-   * @return sc  to  tc 转换器实例
+   * @return 将来源拷贝到目标的转换器
+   * @throws ConverterGenerateException    生成转换器字节码时发生异常
+   * @throws ConverterNewInstanceException 初始化转换器发生异常
    */
   @Contract(pure = true)
   @SuppressWarnings("unchecked")
@@ -122,10 +134,10 @@ public <S, T> Converter<S, T> generateConverter(
     ClassLoader cl = Optional.ofNullable(configuration.getClassLoader()).orElse(chooseClassLoader(sc, tc));
     // 生成类名称
     String className;
-    Set<String> reservedClassNames = getClassLoaderReversedNames(cl);
-    synchronized (reservedClassNames) {
-      className = configuration.getNamingPolicy().getClassName(sc, tc, reservedClassNames::contains);
-      reservedClassNames.add(className);
+    Set<String> classNames = getReservedClassNames(cl);
+    synchronized (classNames) {
+      className = configuration.getNamingPolicy().getClassName(sc, tc, classNames::contains);
+      classNames.add(className);
     }
 
     Class<Converter<S, T>> c;
@@ -142,8 +154,8 @@ public <S, T> Converter<S, T> generateConverter(
         c = (Class<Converter<S, T>>) unsafe.defineClass(null, code, 0, code.length, cl, null);
       }
     } catch (Exception e) {
-      synchronized (reservedClassNames) {
-        reservedClassNames.remove(className);
+      synchronized (classNames) {
+        classNames.remove(className);
       }
       throw new ConverterGenerateException(sc, tc, e);
     }
@@ -170,17 +182,6 @@ private void checkSourceType(Class<?> c) {
     }
   }
 
-  private Set<String> getClassLoaderReversedNames(ClassLoader cl) {
-    Set<String> names = classNames.get(cl);
-    if (names == null) {
-      synchronized (classNames) {
-        names = new HashSet<>(32);
-        classNames.put(cl, names);
-      }
-    }
-    return names;
-  }
-
   private void checkTargetType(Class<?> c) {
     int modifiers = c.getModifiers();
 
diff --git a/src/main/java/io/github/tanyaofei/beancopier/utils/CodeEmitter.java b/src/main/java/io/github/tanyaofei/beancopier/utils/CodeEmitter.java
index e231f15..74acf73 100644
--- a/src/main/java/io/github/tanyaofei/beancopier/utils/CodeEmitter.java
+++ b/src/main/java/io/github/tanyaofei/beancopier/utils/CodeEmitter.java
@@ -111,7 +111,7 @@ public static void newObject(MethodVisitor v, Class<?> objType) {
     v.visitTypeInsn(NEW, Type.getInternalName(objType));
   }
 
-  public static void newInstanceViaNoArgsConstructor(MethodVisitor v, Class<?> objType) {
+  public static void newInstance(MethodVisitor v, Class<?> objType) {
     newObject(v, objType);
     v.visitInsn(DUP);
     invokeNoArgsConstructor(v, objType);