Dot installation study memo 01

Question memo about [Introduction to Java 8 # 31 Let's handle exception handling]

Question 1. Suddenly it starts with the following inheritance, but is the Exception class (?) Predefined in Java?  class MyException extends Exception Understanding 1. That's right. Reference: https://qiita.com/k4h4shi/items/2c39edaeef1c92f6644a     http://www.itsenka.com/contents/development/java/exception.html

Question 2. What are "throw" and "catch"? Understanding 2. Exceptions used in combination with try. Reference: https://www.sejuku.net/blog/26344

Question 3. What is ArithmeticException? Understanding 3. Illegal arithmetic (division by zero, etc.) This is also predefined (?) You can write it suddenly.

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