在Kotlin中使用数据类的特征？
我有两个模型对象/ DTO定义为数据类
public data class ModelA(val limit: Int, val offset: Int, val someDataA: DataAlpha) public data class ModelB(val limit: Int, val offset: Int, val someDataB: DataBeta) 我想概括分页的基础上像Paginable特质：
trait Paginable { var limit: Int var offset: Int }
但是让ModelA实现Paginable会导致一个错误：
错误：“偏移量”隐藏超类型“可分页”的成员，并需要“覆盖”修饰符
添加覆盖 ：
public data class ModelB(override val limit: Int, override val offset: Int, val someDataB: DataBeta) : Paginable
导致更有趣的错误，崩溃的编译器：
Error:java.lang.ClassCastException: org.jetbrains.kotlin.psi.JetParameter cannot be cast to org.jetbrains.kotlin.psi.JetProperty at org.jetbrains.kotlin.resolve.OverrideResolver$3.varOverriddenByVal(OverrideResolver.java:562) at org.jetbrains.kotlin.resolve.OverrideResolver.checkOverridesForMemberMarkedOverride(OverrideResolver.java:606) at org.jetbrains.kotlin.resolve.OverrideResolver.checkOverrideForMember(OverrideResolver.java:529) at org.jetbrains.kotlin.resolve.OverrideResolver.checkOverridesInAClass(OverrideResolver.java:269) at org.jetbrains.kotlin.resolve.OverrideResolver.checkOverrides(OverrideResolver.java:260) at org.jetbrains.kotlin.resolve.OverrideResolver.check(OverrideResolver.java:67) at org.jetbrains.kotlin.resolve.LazyTopDownAnalyzer.analyzeDeclarations(LazyTopDownAnalyzer.java:299) at org.jetbrains.kotlin.resolve.LazyTopDownAnalyzerForTopLevel.analyzeDeclarations(LazyTopDownAnalyzerForTopLevel.java:77) at org.jetbrains.kotlin.resolve.LazyTopDownAnalyzerForTopLevel.analyzeFiles(LazyTopDownAnalyzerForTopLevel.java:69) at org.jetbrains.kotlin.resolve.jvm.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.java:147) at org.jetbrains.kotlin.resolve.jvm.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegrationWithCustomContext(TopDownAnalyzerFacadeForJVM.java:100) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$2.invoke(KotlinToJVMBytecodeCompiler.java:307) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$2.invoke(KotlinToJVMBytecodeCompiler.java:300) at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.java:232) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.java:299) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyzeAndGenerate(KotlinToJVMBytecodeCompiler.java:282) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileBunchOfSources(KotlinToJVMBytecodeCompiler.java:208) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.java:189) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.java:49) at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.java:148) at org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile.callCompiler(Tasks.kt:86) at org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile.compile(Tasks.kt:62) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:218) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211) at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:579) at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:562) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53) at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
我知道特质可以在类体内“手动”实现，但是这将会破坏数据类， hashCode和copy将忽略添加的属性。
你可以通过在两边（ trait和data class ）中使用相同的属性类型（ val / var ）来修复你的代码。