What is the method for custom exception handling in Jav…

In Java, custom exception handling is achieved by creating a custom exception class. To create a custom exception class, one needs to inherit from the Exception class or its subclasses, and then override the constructor method and getMessage() method. Use the throw keyword to throw the custom exception where needed. In the calling code, use a try-catch block to catch and handle the custom exception. Below is an example:

// 自定义异常类
class MyException extends Exception {
    public MyException(String message) {
        super(message);
    }
}

// 使用自定义异常类
public class Main {
    public static void main(String[] args) {
        try {
            throw new MyException("This is a custom exception");
        } catch (MyException e) {
            System.out.println("Caught custom exception: " + e.getMessage());
        }
    }
}

In the example above, the MyException class inherits from the Exception class and defines a constructor method with a message parameter. In the main method, a custom exception is thrown using the throw keyword, caught and handled in a catch block. Finally, the message of the exception is printed.