1.What type of exceptions must be explicitly declared in a throws clause of a method? 2. In question 3 of the Chapter 6 Self Test, you created a Stack class. Add custom exceptions to your class that...

1.What type of exceptions must be explicitly declared in a throws clause of a method? 2. In question 3 of the Chapter 6 Self Test, you created a Stack class. Add custom exceptions to your class that report stack full and stack empty conditions. 3. What are the three ways that an exception can be generated? 4. What are the two direct subclasses of Throwable? 5 What is the multi-catch feature?