How to use Java finally statement
Description
Any code that would be executed regardless after a try block is put in a
finally block.
Syntax
This is the general form of an exception-handling block:
try { //from ww w .ja v a 2 s . c om
// block of code to monitor for errors
}
catch (ExceptionType1 exOb) {
// exception handler for ExceptionType1
}
catch (ExceptionType2 exOb) {
// exception handler for ExceptionType2
}
// ...
finally {
// block of code to be executed after try block ends
}
Note
finally creates a block of code that will be
executed after a try/catch block has completed.
The finally block will execute even if no catch statement matches the exception.
finally block can be useful for closing file handles and freeing up any other resources.
The finally clause is optional.
Example
public class Main {
// Through an exception out of the method.
static void methodC() {
try {/* w w w.ja v a 2s .com*/
System.out.println("inside methodC");
throw new RuntimeException("demo");
} finally {
System.out.println("methodC finally");
}
}
// Return from within a try block.
static void methodB() {
try {
System.out.println("inside methodB");
return;
} finally {
System.out.println("methodB finally");
}
}
// Execute a try block normally.
static void methodA() {
try {
System.out.println("inside methodA");
} finally {
System.out.println("methodA finally");
}
}
public static void main(String args[]) {
try {
methodC();
} catch (Exception e) {
System.out.println("Exception caught");
}
methodB();
methodA();
}
}
The code above generates the following result.
