Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java throws Keyword?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
public ___ Main {3Order
Put the learning moves in the order that makes the concept easiest to apply.
The throws keyword indicates what exception type may be thrown by a method.
Definition and Usage
Java throws Keyword
❮ Java Keywords
Example
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 |
- throw is followed by an object (new type )
- used inside the method
- 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