How do you throw an exception in Java?
Exceptions are events that occur during the execution of a program that disrupt the normal flow of instructions. In Java, exceptions are represented by objects that are thrown when an exceptional condition occurs. To throw an exception, you use the throw keyword followed by an instance of the exception class.
For example, the following code throws an ArithmeticException when the denominator of a fraction is zero:
```java public static void main(String[] args) { int numerator = 10; int denominator = 0;
try { int fraction = numerator / denominator; } catch (ArithmeticException e) { System.out.println("An error occurred: " + e.getMessage()); } } ```
When this code is executed, the ArithmeticException is thrown and caught by the catch block. The catch block prints the error message to the console.
Related Questions
- What is the difference between a checked exception and an unchecked exception? Checked exceptions must be handled or declared in the method signature, while unchecked exceptions do not.
- How can you create your own custom exception class?
You can create a custom exception class by extending the
Exceptionclass. - What is the purpose of the
finallyblock? Thefinallyblock is used to execute code that should always be executed, regardless of whether an exception is thrown or not. - How can you rethrow an exception?
You can rethrow an exception by using the
throwkeyword followed by the exception object. - What are the benefits of using exceptions? Exceptions provide a way to handle errors gracefully and to prevent your program from crashing.
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