kotlin class interface和 abstract

8 kotlin之interface和 abstract的使用

interface IDatabase {
    fun connect()
    fun close()
}

abstract class Database(databaseName: String) : IDatabase {
    val databaseName: String = databaseName
    var connectString: String = ""
    fun showInfo() {
        println("databaseName.: $databaseName")
    }
}

class Oracle(connectString: String) : Database("Oracle") {
    init {
        println("init....")
        super.connectString = connectString
    }

    override fun connect() {
        println("$databaseName connect $connectString")
    }

    override fun close() {
        println("$databaseName close")
    }

}

fun main() {
    var oracle = Oracle("数据库链接")
    oracle.showInfo();
    oracle.connect()
    oracle.close()

}
 

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