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Checking the specified class contains a field matching the specified name using Java Reflections | JavaInUse

Checking the specified class contains a field matching the specified name using Java Reflections


In this tutorial we check if the specified field exists for a class. We make use of Java Reflections.

Lets Begin

Initially using Java Reflections the class fields are looped and stored in a HashSet. Then later if it is to be checked if a field exists for the class it is checked if it is present in the properties Set created before. Create the Employee class as follows-
package com.javainuse.domain;

    public class Institute {
    private String name;
    private int code;
    public String getName() {
        return name;
    public void setName(String name) { = name;
    public int getCode() {
        return code;
    public void setCode(int code) {
        this.code = code;

package com.javainuse.main;

import java.lang.reflect.Field;
import java.util.HashSet;
import java.util.Set;
import com.javainuse.domain.Institute;

public class CheckFieldMain {

    public static void main(String[] args) {
        Institute institute = new Institute();
        Set<String> sourceFieldList = getAllFields(institute.getClass());
        boolean hasName = ifPropertpresent(sourceFieldList, "name");
        boolean hasAddress = ifPropertpresent(sourceFieldList, "address");
 * Check if field is present for the class
 * @param properties
 * @param propertyName
 * @return
    private static boolean ifPropertpresent(final Set<String> properties, final String propertyName) {
        if (properties.contains(propertyName)) {
            return true;
        return false;

     * Recursive method to get fields
     * @param type
     * @return
    private static Set<String> getAllFields(final Class<?> type) {
        Set<String> fields = new HashSet<String>();
        //loop the fields using Java Reflections
        for (Field field : type.getDeclaredFields()) {
        //recursive call to getAllFields
        if (type.getSuperclass() != null) {
        return fields;

Download Source Code

Download it - Java project to check if field is present in class

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