2.编写一个自定义异常类，在另一个类中抛出至少三种异常并捕捉，要求其中一种异常是前面的自定义异常Java

自定义异常类 MyException：

public class MyException extends Exception {
    public MyException(String message) {
        super(message);
    }
}

另一个类中抛出三种异常并捕捉：

public class TestException {
    public static void main(String[] args) {
        try {
            // 抛出自定义异常
            throw new MyException("This is a custom exception.");

            // 抛出数组越界异常
            int[] arr = {1, 2, 3};
            System.out.println(arr[3]);

            // 抛出空指针异常
            String str = null;
            System.out.println(str.length());
        } catch (MyException e) {
            System.out.println("Caught MyException: " + e.getMessage());
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("Caught ArrayIndexOutOfBoundsException: " + e.getMessage());
        } catch (NullPointerException e) {
            System.out.println("Caught NullPointerException: " + e.getMessage());
        }
    }
}