Java Reflection Field Value Set setFieldValue(Object objectInstance, String fieldName, Object valueToSet)

Description

Sets the field value.

License

Open Source License

Parameter

Parameter	Description
objectInstance	the object instance
fieldName	the field name
valueToSet	the value to set

Exception

Parameter	Description
NoSuchFieldException	the no such field exception
IllegalArgumentException	the illegal argument exception
IllegalAccessException	the illegal access exception

Declaration

public static void setFieldValue(Object objectInstance, String fieldName, Object valueToSet)
        throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException 

Method Source Code

//package com.java2s;

import java.lang.reflect.Field;

public class Main {
    /**//from   ww w  .  ja va 2s.com
     * Sets the field value.
     *
     * @param objectInstance the object instance
     * @param fieldName the field name
     * @param valueToSet the value to set
     * @throws NoSuchFieldException the no such field exception
     * @throws IllegalArgumentException the illegal argument exception
     * @throws IllegalAccessException the illegal access exception
     */
    public static void setFieldValue(Object objectInstance, String fieldName, Object valueToSet)
            throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
        if (null == objectInstance)
            return;
        Field fld = getFieldByName(objectInstance.getClass(), fieldName);
        if (fld == null)
            throw new NoSuchFieldException("Field not found: " + fieldName);
        if (!fld.isAccessible())
            fld.setAccessible(true);
        fld.set(objectInstance, valueToSet);

    }

    /**
     * Gets the field by name.
     * @param cls the class to work with
     * @param name the name
     * @return the field by name
     */
    public static Field getFieldByName(Class<?> cls, String name) {

        if (cls == null || cls.isPrimitive())
            return null;

        Field field = null;
        try {
            field = cls.getDeclaredField(name);
        } catch (Exception e) {
        }

        return (field != null) ? field : getFieldByName(cls.getSuperclass(), name);
    }
}

Related

1. setFieldValue(Object object, String fieldName, Object value)
2. setFieldValue(Object object, String fieldName, Object value)
3. setFieldValue(Object object, String fieldName, Object value)
4. setFieldValue(Object object, String name, Object value)
5. setFieldValue(Object object, String name, Object value)
6. setFieldValue(Object pojo, Field field, Object value)
7. setFieldValue(Object receiver, String fieldName, Object value)
8. setFieldValue(Object target, Class targetClass, String fieldName, Object value)
9. setFieldValue(Object target, Field field, Object newValue)