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Introduction & Overview
Read a summary of the section's main ideas. Choose from Basic, Medium, or Detailed.
Quick Overview
Standard
In this section, we focus on the 'throw' keyword in Java, which allows developers to manually raise exceptions, providing control over error handling. An example of raising an ArithmeticException is presented to illustrate its usage.
Detailed
Using throw to Manually Raise Exception in Java
In Java, exceptions can be raised manually using the throw keyword. This is particularly useful when you want to enforce specific conditions in your code and handle them as exceptions. By raising exceptions manually, you can provide more meaningful error messages to users and enhance the robustness of your application.
Key Points
- To raise an exception manually, you use the syntax `throw new ExceptionType(
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Definition of throw
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throw new ExceptionType("message");
Detailed Explanation
The throw statement in Java is used to manually raise an exception. This means you can create an exception and signal that something unexpected has occurred within your code. The exception being thrown can either be a built-in Java exception or a custom exception that you define yourself.
Examples & Analogies
Imagine you're a teacher. If a student doesnβt follow the class rules, you might give them a warning. Similarly, using throw, you tell the program: 'Thereβs a problem here!' just like you would alert a student about their behavior.
Example of Using throw
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public class ThrowExample {
public static void main(String[] args) {
int age = 15;
if (age < 18) {
throw new ArithmeticException("You are underaged!");
}
}
}
Detailed Explanation
In this example, we have a class named ThrowExample. Inside the main method, there's a variable age set to 15. The code checks if age is less than 18. If it is, it raises an ArithmeticException with a message saying, 'You are underaged!'. This is an example of how you can raise exceptions to enforce certain rules in your program.
Examples & Analogies
Think of this like a bouncer at a club checking IDs. If someone tries to enter who is underage, the bouncer won't let them in and may point out, 'You are underaged!' Just as the bouncer takes action to ensure no one underage enters, our code takes action to prevent invalid situations.
Understanding the Output
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π§Ύ Output:
Exception in thread "main" java.lang.ArithmeticException: You are underaged!
Detailed Explanation
When the throw statement is executed in the previous example, the program does not continue its normal flow. Instead, it raises the ArithmeticException which indicates that the code has encountered a problem due to the 'underage' condition. The output gives a clear message about what went wrong, helping developers or users to understand the issue.
Examples & Analogies
This is akin to receiving a rejection note when you attempt to get into the club. The note specifies why you were turned away; in our case, the note clearly states 'You are underaged!', enabling you to understand what needs to be resolved.