Reflect All : Field « Reflection « Java Tutorial

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class ReflectApp {
  public static void main(String args[]) {
    String parm = args[0];
    Class className = void.class;
    try {
      className = Class.forName(parm);
    } catch (ClassNotFoundException ex) {
      System.out.println("Not a class or interface.");
    describeClassOrInterface(className, parm);

  static void describeClassOrInterface(Class className, String name) {

    if (className.isInterface()) {
      System.out.println("Interface: " + name);
    } else {
      System.out.println("Class: " + name);

  static void displayModifiers(int m) {
    System.out.println("Modifiers: " + Modifier.toString(m));

  static void displayInterfaces(Class[] interfaces) {
    if (interfaces.length > 0) {
      System.out.println("Interfaces: ");
      for (int i = 0; i < interfaces.length; ++i)

  static void displayFields(Field[] fields) {
    if (fields.length > 0) {
      System.out.println("Fields: ");
      for (int i = 0; i < fields.length; ++i)

  static void displayConstructors(Constructor[] constructors) {
    if (constructors.length > 0) {
      System.out.println("Constructors: ");
      for (int i = 0; i < constructors.length; ++i)

  static void displayMethods(Method[] methods) {
    if (methods.length > 0) {
      System.out.println("Methods: ");
      for (int i = 0; i < methods.length; ++i)

7.4.1.Recursively get all fields for a hierarchical class tree
7.4.2.Reflect All
7.4.3.System class reflection
7.4.4.Get all declared fields from a class
7.4.5.Getting the Field Objects of a Class Object: By obtaining a list of all declared fields.
7.4.6.Getting the Field Objects of a Class Object: By obtaining a list of all public fields, both declared and inherited.
7.4.7.Getting the Field Objects of a Class Object: By obtaining a particular Field object.
7.4.8.Reflection, Introspection, and Naming
7.4.9.Get the name of a primitive type
7.4.10.Getting and Setting the Value of a Field (assumes that the field has the type int)
7.4.11.Retrieving a Predefined Color by Name
7.4.12.Get a variable value from the variable name
7.4.13.Return a list of all fields (whatever access status, and on whatever superclass they were defined) that can be found on this class.
7.4.14.Checks whether the specified class contains a field matching the specified name.
7.4.15.Return Retrurns the Type of the given Field or Method