leaning for Class---2
public native boolean isPrimitive();

?该方法只有八种基本类型的wrapper 类以及void 的wrapper类会返回true.

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    /**     * Gets the signers of this class.     *     * @return  the signers of this class, or null if there are no signers.  In     *          particular, this method returns null if this object represents     *          a primitive type or void.     * @since   JDK1.1     */    public native Object[] getSigners();    /**     * Set the signers of this class.     */    native void setSigners(Object[] signers);

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这2个方法的意思很简单，就是get/set签名，但我 不清楚这2个方法有啥子用途>>>

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public Method getEnclosingMethod() {        EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();//得到enclosing类的信息        if (enclosingInfo == null)            return null;        else {            if (!enclosingInfo.isMethod())//排除构造方法                return null;            MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),                                                              getFactory());            Class<?>   returnType       = toClass(typeInfo.getReturnType());            Type []    parameterTypes   = typeInfo.getParameterTypes();            Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];             //得到enclosing方法的返回值类型，参数类型            // Convert Types to Classes; returned types *should*            // be class objects since the methodDescriptor's used            // don't have generics information            for(int i = 0; i < parameterClasses.length; i++)                parameterClasses[i] = toClass(parameterTypes[i]);            /*             * Loop over all declared methods; match method name,             * number of and type of parameters, *and* return             * type.  Matching return type is also necessary             * because of covariant returns, etc.             */            //比对类的返回值，名字，参数等信息，得到相同的method并返回            for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) {                if (m.getName().equals(enclosingInfo.getName()) ) {                    Class<?>[] candidateParamClasses = m.getParameterTypes();                    if (candidateParamClasses.length == parameterClasses.length) {                        boolean matches = true;                        for(int i = 0; i < candidateParamClasses.length; i++) {                            if (!candidateParamClasses[i].equals(parameterClasses[i])) {                                matches = false;                                break;                            }                        }                        if (matches) { // finally, check return type                            if (m.getReturnType().equals(returnType) )                                return m;                        }                    }                }            }            throw new InternalError("Enclosing method not found");        }    }

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?类似的方法还有下面这个getEnclosingConstructor()，就不多做解释了

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  public Constructor<?> getEnclosingConstructor()

?这些方法的重点在于：?getEnclosingMethodInfo() 方法

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private EnclosingMethodInfo getEnclosingMethodInfo() {Object[] enclosingInfo = getEnclosingMethod0();// 如果方法内没有local class 或者Anonymous class，则enclosingInfo ==  null,如果有，就新建一个EnclosingMethodInfo 类if (enclosingInfo == null)return null;else {return new EnclosingMethodInfo(enclosingInfo);}}

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?在看看2个方法

    public native Class<?> getDeclaringClass();  //可以发现 getEnclosingClass()方法进一步wrapper了getDeclaringClass  //如果得到的enclosingInfo 为null 就调用getDeclaringClass 方法  // 也就是说 getEnclosingClass不仅可以定位非方法内部类的声明位置，也可以定位方法内部类的声明位置    public Class<?> getEnclosingClass() {              EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();        //如果当前的Class不是方法内部类，则enclosingInfo为null， 否则有值非null。        if (enclosingInfo == null) {            // This is a top level or a nested class or an inner class (a, b, or c)            //不是方法内部类，直接调用getDeclaringClass() 方法            return getDeclaringClass();        } else {            Class<?> enclosingClass = enclosingInfo.getEnclosingClass();            // This is a local class or an anonymous class (d or e)            if (enclosingClass == this || enclosingClass == null)                throw new InternalError("Malformed enclosing method information");            else                //方法内部类，返回 enclosingInfo的属性 enclosingClass,也就是外层包围类                return enclosingClass;        }    }

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