Data commit

Task/Exceptions/Scala/exceptions.scala

@@ -0,0 +1,62 @@
+//Defining exceptions
+class AccountBlockException extends Exception
+class InsufficientFundsException(val amount: Double) extends Exception
+
+class CheckingAccount(number: Int, var blocked: Boolean = false, var balance: Double = 0.0) {
+  def deposit(amount: Double) { // Throwing an exception 1
+    if (blocked) throw new AccountBlockException
+    balance += amount
+  }
+
+  def withdraw(amount: Double) { // Throwing an exception 2
+    if (blocked) throw new AccountBlockException
+    if (amount <= balance) balance -= amount
+    else throw new InsufficientFundsException(amount - balance)
+  }
+}
+
+object CheckingAccount extends App {
+
+  class ExampleException1 extends Exception
+
+  val c = new CheckingAccount(101)
+  println("Depositing $500...")
+  try {
+    c.deposit(500.00)
+    println("\nWithdrawing $100...")
+    c.withdraw(100.00)
+    println("\nWithdrawing $600...")
+    c.withdraw(600.00)
+  } catch { // Exception handler
+    case ac: InsufficientFundsException => println(s"Sorry, but you are short ${'$'} ${ac.amount}")
+    case ac: AccountBlockException      => println("Account blocked.")
+
+    ///////////////////////////// An example of multiple exception handler ////////////////////////
+    case e@(_: ExampleException1 |
+      _: InterruptedException) => println(s"Out of memory or something else.")
+
+    case e: Exception => e.printStackTrace()
+    case _: Throwable => // Exception cached without any action
+  } finally println("Have a nice day")
+}
+
+object CheckingBlockingAccount extends App {
+  val c = new CheckingAccount(102, true)
+  println("Depositing $500...")
+  try {
+    c.deposit(500.00)
+    println("\nWithdrawing $100...")
+    c.withdraw(100.00)
+    println("\nWithdrawing $600...")
+    c.withdraw(600.00)
+  } catch { // Exception handler
+    case ac: InsufficientFundsException => println(s"Sorry, but you are short ${'$'} ${ac.amount}")
+    case ac: AccountBlockException      => println("Account blocked.")
+    case e: Exception                   => e.printStackTrace()
+    case _: Throwable                   =>
+  } finally println("Have a nice day")
+}
+
+object NotImplementedErrorTest extends App {
+  ??? // Throws  scala.NotImplementedError: an implementation is missing
+}