Java - using reflection to copy matching fields from one object to another

Misc.java

    /**
     * Use reflection to shallow copy simple type fields with matching names from one object to another
     * @param fromObj the object to copy from
     * @param toObj the object to copy to
     */
    public static void copyMatchingFields( Object fromObj, Object toObj ) {
        if ( fromObj == null || toObj == null )
            throw new NullPointerException("Source and destination objects must be non-null");
        
        Class fromClass = fromObj.getClass();
        Class toClass = toObj.getClass();

        Field[] fields = fromClass.getDeclaredFields();
        for ( Field f : fields ) {
            try {
                Field t = toClass.getDeclaredField( f.getName() );

                if ( t.getType() == f.getType() ) {
                    // extend this if to copy more immutable types if interested
                    if ( t.getType() == String.class
                            || t.getType() == int.class || t.getType() == Integer.class
                            || t.getType() == char.class || t.getType() == Character.class) {
                        f.setAccessible(true);
                        t.setAccessible(true);
                        t.set( toObj, f.get(fromObj) );
                    } else if ( t.getType() == Date.class  ) {
                        // dates are not immutable, so clone non-null dates into the destination object
                        Date d = (Date)f.get(fromObj);
                        f.setAccessible(true);
                        t.setAccessible(true);
                        t.set( toObj, d != null ? d.clone() : null );
                    }
                }
            } catch (NoSuchFieldException ex) {
                // skip it
            } catch (IllegalAccessException ex) {
                log.error("Unable to copy field: {}", f.getName());
            }
        }
    }

immutable types : We can add BigDecimal as well 👍

Great!