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This code is correct, you will need to provide more context and details about what it means to not work right

My first instinct is to have you try a DELETE... WHERE IN (SELECT [from second table])
But on the MySQL documentation there was a comment that it wasn't working and he came up with his own solution....

If you are asking if you can put a try/catch block inside an "outer" catch block, the answer is yes.

A stack trace or specific error message would be very very helpful.

Most of your answers are correct.

However, 3b is wrong - a default constructor has no parameters.

As for 3f. Imagine a method where a color is passed into the method and if the car color the...

From code maintainability and understandability stand points it does make more sense to simply provide getters for the variables that you want to expose from the abstract class.

If you are looking to simply administer MySQL then phpMyAdmin (phpMyAdmin) is a good option. But if you are looking for something to build an actual front end (your post wasn't clear on that...

If you want help, you need to give a clearer description of the problem and preferably a stack trace

You will need to provide more context for your question. If you are looking for help with java, simply go to java.sun.com. If you are looking for the help documentation for this "Java Doctor" it...

Often the local directory is not in the classpath, to add it, simply add the following to your options: '-cp .'

This will force the classpath - which is the locations for which it will look for...