RTTI:获取类的详细信息(一)

通过RTTI，Class类和Reflection可以获取某个类的详细信息，包括其没有Public出来的信息，先看一个实例：

[java]
public class ClassExtractor {
/** to discard qualifiers */
private static final Pattern pattern = Pattern.compile("\\w+\\.");

private static String removeQualifiers(String name) {
return pattern.matcher(name).replaceAll("");
}

public void inheritedMethod() {

}
/**
* @param className -- must be full qualified, i.e. with package name, like: java.lang.String, otherwise you get
* {@link ClassNotFoundException}
* @throws ClassNotFoundException
*/
public static void dumpClassInfo(String className) throws ClassNotFoundException {
final StringBuilder sb = new StringBuilder();
final Class< > clazz = Class.forName(className);
sb.append(clazz.toString() + " {\n");
// Fields
// 'Declared' in the Class methods means all the stuff(fields, methods) declared by this class
// Class#getDeclaredMethods(), returns all methods declared by this class, including private, public, protected and
// package, but excluding inherited methods
// while, Class#getMethods(), returns all the public methods, including inherited ones
Field[] declaredFields = clazz.getDeclaredFields();
if (declaredFields != null) {
sb.append("declared fields:\n");
for (Field f : declaredFields) {
sb.append("\t" + removeQualifiers(f.toString()) + "\n");
}
}
Field[] fields = clazz.getFields();
if (fields != null) {
sb.append("feids:\n");
for (Field f : fields) {
sb.append("\t" + removeQualifiers(f.toString()) + "\n");
}
}
// Methods