从Java类继承的数据类

Question

I have a data class in Kotlin that inherits from a Java class, which defines a constructor with 1 argument,

public BaseClass(String userSessionId) {
    this.userSessionId = userSessionId;
}

My Kotlin class is defined as this

class DerivedClass(
    userSessionId: String,
    var other: Other? = null
) : BaseClass(userSessionId) {

I can't define it as a data class because of userSessionId, which Kotlin requires to be a val or var in data classes. However, if I do so, then Retrofit throws an exception because there are 2 members named userSessionId. Is there a way to have a data class inherit from a Java class with a constructor taking arguments? Note that I cannot change the base class.

A possible solution is to define a dummy val to avoid the name clash, but this is less than ideal

data class DerivedClass(
    val dummy: String,
    var other: Other? = null
) : BaseClass(dummy) {

Answer 1

您可以在Java中使用transient关键字来忽略序列化过程中的字段，这可以在Kotlin中通过使用@Transient上的@Transient批注来完成。