如果使用 Lombok @Builder 进行初始化，则 Function 实现保持为 null
我正在使用 Lombok 来初始化一个类。该类还定义了一些函数。当从上面初始化的对象调用时，这些函数保持为空。
VehicleTest Class:
public class VehicleTest {
public static void main(String...arg) {
Vehicle vehicle = Vehicle.builder()
.createdDateTime(DateUtil.getEpochTimeFromCurrentTimeZone())
.make("Toyota")
.year("2010")
.model("Fortunner")
.build();
System.out.println(vehicle.convertEpochToString.apply(DateUtil.getEpochTimeFromCurrentTimeZone()));
}
}
Vehicle Class:
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Vehicle {
Long createdDateTime;
String year;
String make;
String model;
public String getTime() {
return convertEpochToString.apply(createdDateTime);
}
public Function<Long,String> convertEpochToString = epochTime -> {
ZonedDateTime zonedDateTime = DateUtil.convertEpochToZonedDateTime(epochTime);
return DateUtil.formatZonedDateTime(zonedDateTime,"dd-MMM-yyyy");
};
}
正如您在该调试模式中所看到的，这个convertEpochToString 函数为null。
注意：这不是我在项目中使用的实际方式。这只是我用来描述我的问题的一个例子。
正如此链接中提到的，如果我使用
@Builder.Default
在上面的函数上，这似乎有效。但将其添加到每个类中的所有 100 多个函数中对我来说将是一项艰巨的任务。除了上述方法和静态函数之外，还有其他选择吗？
I am using Lombok to initialize a class. That class also has some Functions defined. Those Functions remain null when called from the above initialized object.
VehicleTest Class:
public class VehicleTest {
public static void main(String...arg) {
Vehicle vehicle = Vehicle.builder()
.createdDateTime(DateUtil.getEpochTimeFromCurrentTimeZone())
.make("Toyota")
.year("2010")
.model("Fortunner")
.build();
System.out.println(vehicle.convertEpochToString.apply(DateUtil.getEpochTimeFromCurrentTimeZone()));
}
}
Vehicle Class:
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Vehicle {
Long createdDateTime;
String year;
String make;
String model;
public String getTime() {
return convertEpochToString.apply(createdDateTime);
}
public Function<Long,String> convertEpochToString = epochTime -> {
ZonedDateTime zonedDateTime = DateUtil.convertEpochToZonedDateTime(epochTime);
return DateUtil.formatZonedDateTime(zonedDateTime,"dd-MMM-yyyy");
};
}
As you can see in this debug mode, this convertEpochToString Function is null.
Note: This is not the actual way I am using in my project. This is just an example I made to depict my problem.
As mentioned in this link, if I use
@Builder.Default
on above Function, this seems to be working. But adding it on all 100+ Functions in each class will be a huge task for me. Is there any other alternative apart from the above one and static Function?
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您可以通过在函数声明中添加修饰符
static来解决这种情况。但我不确定这种行为的原因，我认为如果适用于类，Lombok 代码生成可以做出决定，而如果适用于类实例和惰性函数则不能做出决定。
You can solve this case by adding modifier
staticto the function declaration.But I'm not sure about the reasons for such behavior, I think Lombok code generation can make decisions if works with class and can't if works with instance of class and lazy function.
解决了这个问题
并将初始化从 修改
为
这对我来说似乎很容易。
从此处阅读
Solved this problem with
and modifying the initialization from
to
This seems to be quite easy for me.
Read it from here