【设计模式】第五章:创建型模式-建造者

public class OptimizedBuilderPatternDemo {  public static void main(String[] args) {    Product product = new ConcreteBuilder()        .field1("值1")        .field2("值2")        .field3("值3")        .create();    System.out.println(product);  }}class Product {  private String field1;  private String field2;  private String field3;  //省略getter setter方法  @Override  public String toString() {    return "Product [field1=" + field1 + ", field2=" + field2 + ", field3=" + field3 + "]";  }}interface Builder {  Builder field1(String value);  Builder field2(String value);  Builder field3(String value);  Product create();}class ConcreteBuilder implements Builder {  private Product product = new Product();  public Builder field1(String value) {    System.out.println("在设置field1之前进行复杂的校验逻辑");    product.setField1(value);    return this;  }  public Builder field2(String value) {    System.out.println("在设置field2之前进行复杂的数据格式转化逻辑");    product.setField2(value);    return this;  }  public Builder field3(String value) {    System.out.println("在设置field3之前进行复杂的数据处理逻辑，跟其他对象的数据进行关联");    product.setField3(value);    return this;  }  public Product create() {    return product;  }}