You throw an exception by creating an instance of the exception class and passing it to the throw keyword. For example:
MyException ex = new MyException( "This is my exception" ); throw ex;
Or:
throw new MyException( "This is my exception" );
A2:
You handle an exception by call any method that can throw an exception in a try block and then catching the exception in a catch block. If the method accelerate() can throw a CarException then you would handle it as follows:
The try keyword denotes the start of a try block; the try block contains method calls that can throw exceptions and it exists to handle those exceptions.
A4:
java.lang.Throwable
A5:
Exceptions that derive from the java.lang.Exception class.
A6:
Exceptions that derive from the java.lang.RuntimeException class.
A7:
A subclass method can only throw exceptions that are explicitly defined in its super class's method's signature. The only caveat is that it can throw an exception that is of a class type that subclasses one of the super class method's exceptions.
A8:
The throws method is used in a method's signature to define the list of exceptions that the method can throw.
A9:
These are the steps:
Create a class that extends the java.lang.Exception class.
In a class that will throw this exception, create a method that lists the custom exception in its throws clause.
Somewhere in the method create an instance of the custom exception and throw it using the throw keyword.
A10:
Exceptions are classes because they need to be sent from one to another, possibly in a different process. The benefit to you is that you can define your own data and methods in the exception class to help better diagnose the root cause of the problem.
