finally
The finally block always executes no matter what happens in try block regardless exception in handle or not.
In the try block we place that code that frequently used to close the resources that were opened in the try block.
This block is optional to use.
Syntax-
Syntax:-
try
{
//code to open file
}
catch(Exception e)
{
//code to handle exception while reading the file
}
finally
{
//close the file
}
program 1 by using finally :-
class Test1
{
public static void main(String args[])
{
try
{
/*This statement is suspectable the code can throw exception
*we handled this block statement by placing these statements
*inside try block and handled the exception in catch block*/
int num1 = 0;
int num2 = 20 / num1;
System.out.println(num2);
System.out.println("Rest of the try code...");
}
catch (ArithmeticException e)
{
/*This block will only execute to handle Arithmetic exception that will occurs in try block.*/
System.out.println("We can not divide any number by zero..");
}
finally
{
System.out.println("This is finally block that always Execute");
}
System.out.println("Rest of Without Exception Code...");
}
}
OutPut:-
We can not divide any number by zero..
This is finally block that always Execute
Rest of Without Exception Code...
program 2 by using finally with try without catch :-
class Test1
{
public static void main(String args[])
{
try
{
/*This statement is suspectable the code can throw exception
*we handled this block statement by placing these statements
*inside try block and handled the exception in catch block*/
int num1 = 0;
int num2 = 20 / num1;
System.out.println(num2);
System.out.println("Rest of the try code...");
}
finally
{
System.out.println("This is finally block that always Execute");
}
System.out.println("Rest of Without Exception Code...");
}
}
OutPut:-
This is finally block that always Execute
Exception in thread "main" java.lang.ArithmeticException: / by zero
at Test1.main(TryProgram.java:12)
When can finally will not Execute
System. exit() method.
If an exception arising in the finally block.
Finally block and System.exit():-
program 1 by using finally :-
Finally block Without Exception code:-
class Test1
{
public static void main(String args[])
{
try
{
System.out.println("Rest of the try code...");
System.exit(0);
}
catch (Exception exp)
{
System.out.println(exp);
}
finally
{
System.out.println("This is finally block that always Execute");
}
System.out.println("Rest of Without Exception Code...");
}
}
OutPut:-
Rest of the try code...
Finally block with Exception code:-
class Test1
{
public static void main(String args[])
{
try
{
/*This statement is suspectable the code can throw exception
*we handled this block statement by placing these statements
*inside try block and handled the exception in catch block*/
int num1 = 0;
int num2 = 20 / num1;
System.out.println(num2);
System.out.println("Rest of the try code...");
}
catch (Exception exp)
{
System.out.println(exp);
System.exit(0);
}
finally
{
System.out.println("This is finally block that always Execute");
}
System.out.println("Rest of Without Exception Code...");
}
}
OutPut:-
java.lang.ArithmeticException: / by zero
