Check type of primitive field

Question

I\'m trying to determine the type of a field on an object. I don\'t know the type of the object when it is passed to me but I need to find fields which are long

Answer 1

• To detect fields with long type use long.class or Long.TYPE.

• To detect fields with Long type use Long.class.

Example:

for (Field f : o.getClass().getDeclaredFields()) {
    Class clazz = f.getType();
    // to detect both Long and long types
    if (Long.class.equals(clazz) || long.class.equals(clazz)) {
        // found one
    }
}

Notice:

Long.TYPE is static Constant member and is equivalent to long.class.

snippet code form Long Class

/**
 * The {@link Class} object that represents the primitive type {@code long}.
 */
@SuppressWarnings("unchecked")
public static final Class TYPE
        = (Class) long[].class.getComponentType();

Also check for answer for Difference between Integer.class and Integer.TYPE question