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Example

Throw an exception if age is below 18 (print "Access denied"). If age is 18 or older, print "Access granted":

public class Main {

  static void checkAge(int age) throws ArithmeticException {

    if (age < 18) {

      throw new ArithmeticException("Access denied - You must be at least 18 years old.");

    }

    else {

      System.out.println("Access granted - You are old enough!");

    }

  }

 

  public static void main(String[] args) {

    checkAge(15); // Set age to 15 (which is below 18...)

  }

}

 

Definition and Usage

The throws keyword indicates what exception type may be thrown by a method.

There are many exception types available in Java: ArithmeticException, ClassNotFoundException, ArrayIndexOutOfBoundsException, SecurityException, etc.

Differences between throw and throws:

throw

throws

Used to throw an exception for a method

Used to indicate what exception type may be thrown by a method

Cannot throw multiple exceptions

Can declare multiple exceptions

Syntax:

  • throw is followed by an object (new type)
  • used inside the method

Syntax:

  • throws is followed by a class
  • and used with the method signature

Related Pages

Read more about exceptions in our Java Try..Catch Tutorial.

 

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