Java Throws Keyword - W3Schools

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Java throws Keyword

❮ Java Keywords

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...) } }

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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.

❮ Java Keywords

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