Java finally Keyword

The finally block is mainly used to do clean-up tasks. It is always executed even when no exceptions occur. It will not execute only in case the program exits using System. exit() or because of some fatal error causes the program to abort. It is followed by either a catch or a try block.

Note: A try block can have one or more catch blocks associated with it, but only one final block can be associated with it.

Syntax of finally without a catch

try{

      //block of statements

}finally{

}

Syntax of finally with catch

try{

      //block of statements

}catch(){

}finally{

}

Example: finally block when an exception occurs and is handled.

class ArithmaticTest{

    public void division(int num1, int num2){
        try{
            //java.lang.ArithmeticException here.
            System.out.println(num1/num2);
                //catch ArithmeticException here.
        }catch(ArithmeticException e){
            //print exception.
            System.out.println(e);
        }finally{//It will always execute.
              System.out.println("Finally will always execute.");
        }

       System.out.println("Remaining code after exception handling.");
    }
}

public class FinallyExceptionExample2 {
    public static void main(String args[]){
        //creating ArithmaticTest object
        ArithmaticTest obj =  new ArithmaticTest();
        
        //method call
        obj.division(20, 0);
    }
}

Output

java.lang.ArithmeticException: / by zero
Finally will always execute.
Remaining code after exception handling.

Example: finally block when an exception occurs but is not handled.

class ArithmaticTest{

    public void division(int num1, int num2){
        try{
            //java.lang.ArithmeticException here.
            System.out.println(num1/num2);
        }finally{//It will always execute.
              System.out.println("Finally will always execute.");
        }

      System.out.println("Remaining code after exception handling.");
    }
}

public class FinallyExceptionExample3 {
    public static void main(String args[]){
        //creating ArithmaticTest object
        ArithmaticTest obj =  new ArithmaticTest();
        
        //method call
        obj.division(20, 0);
    }
}

Output

Finally will always execute.
Exception in thread "main" 
java.lang.ArithmeticException: / by zero
at com.w3schools.business.ArithmaticTest.division
(FinallyExceptionExample3.java:17)
at com.w3schools.business.FinallyExceptionExample3.main
(FinallyExceptionExample3.java:32)

Example: finally block when no exception occurs.

class ArithmaticTest{
    
    public void division(int num1, int num2){
        try{
            //java.lang.ArithmeticException here.
            System.out.println(num1/num2);
                //catch ArithmeticException here.
        }catch(ArithmeticException e){
            //print exception.
            System.out.println(e);
        }finally{//It will always execute.
               System.out.println("Finally will always execute.");
        }

       System.out.println("Remaining code after exception handling.");
    }
}

public class FinallyExceptionExample1 {
    public static void main(String args[]){
        //creating ArithmaticTest object
        ArithmaticTest obj =  new ArithmaticTest();
        
        //method call
        obj.division(20, 10);
    }
}

Output

2
Finally will always execute.
Remaining code after exception handling.