get Value By Field Name - Java Reflection

Java examples for Reflection:Field Value

  1. HOME
  2. Java
  3. Reflection
  4. Field Value

Description

get Value By Field Name

Demo Code


//package com.java2s;
import java.lang.reflect.Field;

public class Main {

    public static Object getValueByFieldName(Object obj, String fieldName) {
        Object value = null;//from   w  w w . j  a  v  a 2s .  c  om
        try {
            Field field = getFieldByFieldName(obj, fieldName);
            if (field != null) {
                if (field.isAccessible()) {
                    value = field.get(obj);
                } else {
                    field.setAccessible(true);
                    value = field.get(obj);
                    field.setAccessible(false);
                }
            }
        } catch (Exception e) {
        }
        return value;
    }

    public static Field getFieldByFieldName(Object obj, String fieldName) {
        if (obj == null || fieldName == null) {
            return null;
        }
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
                .getSuperclass()) {
            try {
                return superClass.getDeclaredField(fieldName);
            } catch (Exception e) {
            }
        }
        return null;
    }
}

Related Tutorials