find fields of type String, Boolean, Integer using reflection

Is there a way to find fields in a class that are of the Type

    java.lang.Character.TYPE
    java.lang.Byte.TYPE
    java.lang.Short.TYPE
    java.lang.Integer.TYPE
    java.lang.Long.TYPE
    java.lang.Float.TYPE
    java.lang.Double.TYPE

there is a isPrimiti开发者_高级运维ve method for char, byte, short etc.

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You can start with Class#getDeclaredFields() to get an array of the fields in your class. Then, iterate over each Field in the array and filter as needed.

Something like this:

public static List<Field> getPrimitiveFields(Class<?> clazz)
{
    List<Field> toReturn = new ArrayList<Field>();

    Field[] allFields = clazz.getDeclaredFields();

    for (Field f : allFields)
    {
        Class<?> type = f.getType();
        if (type.isPrimitive())
        {
            toReturn.add(f);
        }
    }

    return toReturn;
}

More info:

• Field#getType()
• Class#isPrimitive() (though it sounds like you already know about this one)

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Edit

It might be worth clarifying that the types java.lang.Character.TYPE, etc., are the same thing as the class literals. That is,

• java.lang.Character.TYPE == char.class
• java.lang.Byte.TYPE == byte.class
• java.lang.Short.TYPE == short.class
• java.lang.Integer.TYPE == int.class
• java.lang.Long.TYPE == long.class
• java.lang.Float.TYPE == float.class
• java.lang.Double.TYPE == double.class

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Those types are all primitives, so use isPrimitive().

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I was looking for one method that would return true for wrapper types. Springs ClassUtils provides one such method

ClassUtils.isPrimitiveOrWrapper(field.getType()) 

returns true for all of the above that I requested, except String