问题描述
我想避免使用多个构造函数，所以我想使用构建器设计模式，通过使用 lombok 库，它可以更加容易，所以我想用该库注释:
I want to avoid multiple constructors, so I want to use a builder design pattern, by using lombok library, it can be more easier, so I want to annotate class of ContractDTO with this library annotation:
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
class ContractDTO {
private Integer id;
private String name;
private Integer acquirerId;
private Integer terminalId;
private String merchantId;
}
那么您的代码可以是:
...
.map(g -> new ContractDTO().toBuilder()
.name(g.getName())
.merchantName(g.getMerchantId())
.build()
)....
但是当我尝试编译代码时，我找不到符号[错误]符号:toBuilder()方法
But when I try to compile the code I get cannot find symbol[ERROR] symbol: method toBuilder()
可能我需要提前生成代码?
Probably I need to generate the code in advance?
推荐答案
您可以像这样使用它:
ContractDTO.builder()
.name(g.getName())
.merchantName(g.getMerchantId())
.build();
如果要创建对象的副本或近似副本，可以将属性toBuilder = true添加到@Builder批注.这告诉Lombok向我们的Class添加一个toBuilder()方法.当我们调用toBuilder()方法时，它将返回一个构建器，该构建器使用其调用实例的属性进行初始化.
If we want to create copies or near-copies of objects, we can add the property toBuilder = true to the @Builder annotation. This tells Lombok to add a toBuilder() method to our Class. When we invoke the toBuilder() method, it returns a builder initialized with the properties of the instance it is called on.
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