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Change jersey in brian lara cricket 200711/9/2022 The property methods of Widget.Builder return a reference to the builder so method calls can be chained.Ī really nice feature of this pattern is the ability to do pre-creation validation of an object state. Widget's optional properties can be set using optional property methods on the Widget.Builder. Widget.Builder has a constructor that takes the required properties of Widget. Notice that Widget has no public constructor and no setters and that the only way to create a Widget is using the static inner class Widget.Builder. Public Builder(String name, double price) Here is an class skeleton of the pattern. Setter methods add clutter and force an object to be mutable. Multiple constructors for different modes are confusing. Constructors with too many parameters, especially optional ones, are ugly and hard to use. The basic idea behind the pattern is to limit the number of constructor parameters and avoid the use of setter methods. These examples create various Widgets with two required properties and several optional ones. Here are some examples of the pattern in use. The problems this Builder pattern can solve are too many constructors, too many constructor parameters, and over use of setters to create an object. This Builder is not necessarily a replacement for the original design pattern. There's a Builder pattern that Joshua Bloch has briefly described in a couple of his "Effective Java Reloaded" sessions at Java One.
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