How and When, does finally block get executed in java - deep thinking from C++ concepts RAI Resource Allocation is Initializtion
Does finally block runs even after block/object/function get returned?
Yes. Even if there was an
Exception within catch block, finally will be executed.
If you are familiar with C++, just think
finally as the destructor of an object. What ever the state of a statement within the object, ~Destructor will be executed. But you cant put return withinfinally[some compilers allow though].
See the code below: See how global variable
y been changed. Also see how Exception1 been covered by Exception2.using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace finallyTest
{
class Program
{
static int y = 0;
static int testFinally()
{
int x = 0;
try
{
x = 1;
throw new Exception("Exception1");
x = 2;
return x;
}
catch (Exception e)
{
x = -1;
throw new Exception("Exception2", e);
}
finally
{
x = 3;
y = 1;
}
return x;
}
static void Main(string[] args)
{
try
{
Console.WriteLine(">>>>>" + testFinally());
}
catch (Exception e)
{ Console.WriteLine(">>>>>" + e.ToString()); }
Console.WriteLine(">>>>>" + y);
Console.ReadLine();
}
}
}
output:
>>>>>System.Exception: Exception2 ---> System.Exception: Exception1
at finallyTest.Program.testFinally() in \Projects\finallyTest\finallyTest\Program.cs:line 17
--- End of inner exception stack trace ---
at finallyTest.Program.testFinally() in \Projects\finallyTest\finallyTest\Program.cs:line 24
at finallyTest.Program.Main(String[] args) in \Projects\finallyTest\finallyTest\Program.cs:line 38
>>>>>1
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