finally
块用于在异常时释放资源。资源可能是文件,网络连接,数据库连接等,finally
块执行代码运行保证。以下程序说明了finally
块的用法。
Scala finally块示例
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)
}
}
将上面代码保存到源文件:Demo.scala中,使用以下命令编译并执行代码 -
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...