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Text lesson

throws

Example

If the age is below 18, raise an exception displaying “Access denied”. Otherwise, if the 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 specifies the type of exception that a method may throw, with various exception types accessible in Java such as ArithmeticException, ClassNotFoundException, ArrayIndexOutOfBoundsException, SecurityException, and more.

Distinguishing between throw and throws:

throw	throws
employed to raise an exception within a method	It’s used to specify the type of exception that a method may throw.
It’s not possible to throw multiple exceptions.	It’s possible to declare multiple exceptions.
Syntax The throw keyword is succeeded by an object instantiation (of a specified type). Employed within a method.	Syntax The throws keyword is succeeded by a class. And incorporated into the method signature.