Yes, you can declare it in the companion object. The doc says:
此外,在Java语言中,对象和伴随对象中定义的公共属性以及用const注释的顶级属性都会转换为静电字段
但私有房产似乎也是如此:
class MyException: Exception() {
companion object {
private val serialVersionUid: Long = 1
}
}
javap-c-p com.ninja_squad.kotlindiscovery.MyException.class
Compiled from "MyException.kt"
public final class com.ninja_squad.kotlindiscovery.MyException extends java.lang.Exception {
private static final long serialVersionUid;
public static final com.ninja_squad.kotlindiscovery.MyException$Companion Companion;
static {};
Code:
0: getstatic #38 // Field com/ninja_squad/kotlindiscovery/MyException$Companion.INSTANCE:Lcom/ninja_squad/kotlindiscovery/MyException$Companion;
3: putstatic #40 // Field Companion:Lcom/ninja_squad/kotlindiscovery/MyException$Companion;
6: lconst_1
7: putstatic #21 // Field serialVersionUid:J
10: return
public com.ninja_squad.kotlindiscovery.MyException();
Code:
0: aload_0
1: invokespecial #15 // Method java/lang/Exception."<init>":()V
4: return
public static final long access$getSerialVersionUid$cp();
Code:
0: getstatic #21 // Field serialVersionUid:J
3: lreturn
}