java reflection sample of super class fields.

Main.java

package com.example;

import java.lang.reflect.Field;

import com.example.pojo.Device;
import com.example.pojo.Keyboard;
import com.example.pojo.iPhone;

public class Main {
	public static void main(String[] args) {
		accessClassMetaData(buildKeyboard());
		accessClassMetaData(buildiPhone());
	}

	private static void accessClassMetaData(Device d) {
		Class<?> clazz = d.getClass();
		System.out.println("===" + clazz.getSimpleName() + "===");
		System.out.println(clazz);
		for (Field f : clazz.getDeclaredFields()) {
			System.out.println("   " + f.getName());
		}

		Class<?> superClass;
		while (!(superClass = clazz.getSuperclass()).equals(Object.class)) {
			System.out.println(superClass);
			for (Field f : superClass.getDeclaredFields()) {
				System.out.println("   " + f.getName());
			}
			clazz = clazz.getSuperclass();
		}
	}

	private static Device buildKeyboard() {
		Keyboard keyboard = new Keyboard();
		keyboard.setId(0);
		keyboard.setName("HHKB");
		keyboard.setType("US");
		return keyboard;
	}

	private static Device buildiPhone() {
		iPhone i = new iPhone();
		i.setId(10);
		i.setName("apple");
		i.setOS("ios");
		i.setVersion("11");
		return i;
	}
}