Java: Get all the fields and inherited fields of a class

In this post, I am going to explain how to get all the fields and inherited fields of a class.

 

Step 1: Get all the fields of current class using 'getDeclaredFields' method.

clazzTemp.getDeclaredFields()

Step 2: Get the super class of this class and repeat step 1 for this parent class. Do the steps 1 and 2 until the parent class is null.

 

clazzTemp.getSuperclass()

 

Example

public static List<Field> getAllFields(Class<?> clazz) {
	List<Field> fields = new ArrayList<Field>();
	Class<?> clazzTemp = clazz;

	do {
		fields.addAll(Arrays.asList(clazzTemp.getDeclaredFields()));
	} while ((clazzTemp = clazzTemp.getSuperclass()) != null);

	return fields;
}

Find the below working application.

 

AllFieldsOfAClass.java

package com.sample.app.fields;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class AllFieldsOfAClass {

	public static class Parent {
		int parentA, parentB;
	}

	public static class Child extends Parent {
		private int childA, childB;
	}

	public static List<Field> getAllFields(Class<?> clazz) {
		List<Field> fields = new ArrayList<Field>();
		Class<?> clazzTemp = clazz;

		do {
			fields.addAll(Arrays.asList(clazzTemp.getDeclaredFields()));
		} while ((clazzTemp = clazzTemp.getSuperclass()) != null);

		return fields;
	}

	public static void main(String args[]) {

		getAllFields(Child.class).stream().forEach(field -> {
			System.out.println(field.getName());
		});
	}
}

Output

childA
childB
parentA
parent

 

 

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