Java Reflection Field Set setField(Field field, T newValue, Object instance)

Description

set Field

License

Open Source License

Declaration

private static <T> Object setField(Field field, T newValue, Object instance)
            throws IllegalArgumentException, IllegalAccessException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.lang.reflect.Field;

public class Main {
    private static <T> Object setField(Field field, T newValue, Object instance)
            throws IllegalArgumentException, IllegalAccessException {
        Object old = null;//from w  w w.j  ava  2 s  . c  om
        final boolean accessible = field.isAccessible();

        if (!accessible) {
            field.setAccessible(!accessible);
        }

        old = retrieveField(field, instance);
        field.set(instance, newValue);

        field.setAccessible(accessible);

        return old;
    }

    private static Object retrieveField(Field field, Object obj)
            throws IllegalArgumentException, IllegalAccessException {
        Object item = null;
        final boolean accessible = field.isAccessible();

        if (!accessible) {
            field.setAccessible(!accessible);
        }

        item = field.get(obj);

        if (!accessible) {
            field.setAccessible(accessible);
        }

        return item;
    }
}

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7. setField(final Field field, final Object instance, final Object value)
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