Question

我遵循了Kotlin Plugin for Eclipse的说明。 Hello World测试工作正常。然后，我做了一个File> New> Kotlin文件。

package so2
object LineParserRegistry {
    val parsers = ConcurrentHashMap<KClass<*>, (String) -> Any?>()
    inline fun <reified T> register(noinline parser : (String) -> T?) {
        parsers[T::class] = parser
    }
    inline fun <reified T> get(): (String) -> T? {
        // force companion initializer
        Class.forName(T::class.java.name)
        return parsers[T::class] as (String) -> T??
    }
}
data class College(val id: String, val name: String) {
    companion object {
        init {
            val collegeLineParser: (String) -> College? = { line ->
                val regex = Regex("(\\d+) (.+)")
                regex.matchEntire(line)?.let {
                    College(it.groupValues[1], it.groupValues[2])
                }
            }
            LineParserRegistry.register(collegeLineParser)
        }
    }
}
inline fun <reified T : Any> File.parseLines(): List<T> =
    useLines { it.mapNotNull(LineParserRegistry.get<T>()).toList() }
fun main(){
    val colleges = File("/home/cwhii/work/input.txt").parseLines<College>()
    println("colleges: $colleges")
    println("OK.")
}

Eclipse提议添加我曾经做过的这些imports：

import java.util.concurrent.ConcurrentHashMap
import kotlin.reflect.KClass
import java.io.File

当我运行它时，结果如下：

No Location
    ERROR: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
    class kotlin.text.Regex, unresolved supertypes: java.io.Serializable

/home/cwhii/work/sw/kaptcp/src/so/loadClass.kt
    ERROR: Unresolved reference: File (14, 30)
    ERROR: Unresolved reference: File (18, 17)
/home/cwhii/work/sw/kaptcp/src/so2/hiddenReg.kt
    ERROR: Unresolved reference: java (2, 8)
    ERROR: Unresolved reference: java (4, 8)
    ERROR: Unresolved reference: ConcurrentHashMap (6, 19)
    ERROR: Unresolved reference: Class (12, 9)
    ERROR: Cannot access class 'java.lang.Class'. Check your module classpath for missing or conflicting dependencies (12, 32)
    ERROR: Unresolved reference: name (12, 37)
    ERROR: Unresolved reference: File (29, 30)
    ERROR: Unresolved reference: File (32, 20)

首先如何解决？其次，为什么Eclipse指出了import问题，却没有指出其他问题？

Eclipse>窗口>首选项> Java>构建路径>类路径变量

我认为，由于Eclipse知道足够多，可以建议import java.io.File中的import java.io将java.io.Serializable放在同一位置，因此它将在系统上存在以便找到它。如果不是这样，我该在哪里找到和不应该在这里？

Answer 1

尝试在Eclipse偏好设置-> kotlin->编译器上设置JDK home选项，它为我工作了

Eclipse / Kotlin仅识别一些需要的导入

1 个答案: