生成器模式[builder]

将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示.

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public class Client {public static void main(String[] args) {BuilderA builder = new BuilderA();Director director = new Director(builder);director.construct();Product product = builder.getResult();System.out.println(product);}}