Java / Design Patterns
Explain builder pattern in Java.
Builder pattern combines the safety of the telescoping constructor pattern with the readability of the JavaBeans pattern.
To create the desired object, the client first calls a constructor (or static factory) with all of the required parameters and gets a builder object. Then the client calls setter-like methods on the builder object to set each optional parameter of interest. Finally, the client calls a parameter-less build method to generate the object, which is immutable.
The builder is a static member class of the class it builds.
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