Difference
between final, finally, and finalize:
final:
1. final is the modifier applicable for classes, methods and
variables.
2. If a class declared as the final then child class creation is not
possible.
3. If a method declared as the final then overriding of that method
is not possible.
4. If a variable declared as the final then reassignment is not
possible
class FinalDemo {
public static void
main(String[] args) {
final int x = 10;
x = 20;// Compile
Time Error
}
}
finally:
1. finally
is the block always associated with try-catch to maintain clean up code which
should be executed always irrespective of whether exception raised or not
raised and whether handled or not handled.
class FinallyDemo{
public static void
main(String[] args) {
try
{
int x
= 30;
} catch
(Exception e) {
System.out.println(e);
} finally
{
System.out.println("finally block is executed");
}
}
}
finalize:
1. finalize
is a method, always invoked by Garbage Collector just before destroying an
object to perform cleanup activities.
Note:
1.
finally block meant for cleanup activities related to try block where as
finalize() method meant for cleanup activities related to object.
2.
To maintain clean up code finally block is recommended over finalize() method
because we can't expect exact behavior of GC.
class FinalizeDemo {
public void finalize()
{
System.out.println("finalize
called");
}
public static void
main(String[] args) {
FinalizeDemo f1 = new FinalizeDemo();
FinalizeDemo f2 = new FinalizeDemo();
f1 = null;
f2 = null;
System.gc();
}
}
