Scala finally塊

finally塊用於在異常時釋放資源。資源可能是檔，網路連接，資料庫連接等，finally塊執行代碼運行保證。以下程式說明了finally塊的用法。

Scala finally塊示例

class ExceptionExample{
    def divide(a:Int, b:Int) = {
        try{
            a/b
            var arr = Array(1,2)
            arr(10)
        }catch{
            case e: ArithmeticException => println(e)
            case ex: Exception =>println(ex)
            case th: Throwable=>println("found a unknown exception"+th)
        }
        finally{
            println("Finaly block always executes")
        }
        println("Rest of the code is executing...")
    }
}


object Demo{
    def main(args:Array[String]){
        var e = new ExceptionExample()
        e.divide(100,10)

    }
}

將上面代碼保存到原始檔案：Demo.scala中，使用以下命令編譯並執行代碼 -

D:\software\scala-2.12.3\bin>scalac Demo.scala
D:\software\scala-2.12.3\bin>scala Demo.scal
java.lang.ArrayIndexOutOfBoundsException: 10
Finally block always executes
Rest of the code is executing...