是否可以使用反射从Java中的类中检索所有成员（包括private）？

Question

I'd like to be able to write, for example

Method[] getMethods(Class<?> c)

which would do the same thing as the existing

Class.getMethods()

but also include private and protected methods. Any ideas how I could do this?

Answer 1

public Method[] getMethods(Class<?> c) {
    List<Method> methods = new ArrayList<Method>();
    while (c != Object.class) {
        methods.addAll(Arrays.asList(c.getDeclaredMethods()));
        c = c.getSuperclass();
    }

    return methods.toArray(new Method[methods.size()]);
}

To explain:

• getDeclaredMethods returns all methods that are declared by a certain class, but not its superclasses
• c.getSuperclass() returns the immediate superclass of the given class
• thus, recursing up the hierarchy, until Object , you get all methods
• in case you want to include the methods of Object , then let the condition be while (c != null)

Answer 2

Use Class.getDeclaredMethods() instead. Note that unlike getMethods() , this won't return inherited methods - so if you want everything, you'll need to recurse up the type hierarchy.

Answer 3

Javadoc文档描述了所有细节。