Properties

A property of an object is a characteristic that has a single value, such as the name of a window or the font of a character. Properties of an object are distinguished from each other by their unique labels. For example, the Window class definition shown in Table 5-2 includes the Position property. Its unique label is the label Position. The definition also lists the class to which each property belongs. For example, the class of the Position property is Point, indicating that the value of the property is a two-dimensional point. Because the Position property is not marked read only, you can set its value. The class of a property can be a simple value class like String or Number, a composite class like the Point class, or a more complex object class, perhaps with properties of its own.