Create a system with three classes (one of which is a test driver):

1. Create a CodeBot class (

CodeBot.java

) that has two

private

fields: className and

code (both are of type String).

o

Create a

no-arg

constructor that hard-codes the class name (e.g., Hello) and

initializes the code field with a string that represents a simple Java class that

displays something (e.g, hello, world) to standard output (e.g.,

"public

class Hello { public static void main(String[] args) {

System.out.println(\"hello, world\");}}").

o

Create another constructor that requires that the class name and code are

provided by the caller (i.e., a constructor with two String parameters).

o

Both constructors should call the private saveCode method (see below) to

save the code to the file system as part of constructing a CodeBot object.

o

Create a private helper method named saveCode that is based on Listing 12.14

on page 477 (Liang, 10th edition). This method should have a void return type

and result in a file being written in your projects root directory.

o

Create a public compile method that accepts no input arguments. If the class

name is not found in the code, the method will throw a CompilationException

with the message Class name must be found in code. Otherwise, it will print

out a message: The program

className.java

has compiled successfully.

2. Create a CompilationException class (

CompilationException.java

) that is a subclass

of Exception (i.e., a custom checked exception).

3. Create a CodeBotTest class (

CodeBotTest.java

) that instantiates a CodeBot object

using the no-arg constructor and then call the compile method. It should then create

another CodeBot object using the other constructor with className = Hello2 and

code =

"public class { public static void main(String[] args) {

System.out.println(\"hello, world\");}}"

and then call the compile method.

Here is a sample run:

Program Hello.java has compiled successfully.

Exception in thread "main" CompilationException: Class name must be found in code.

at CodeBot.compile(CodeBot.java:33)

at CodeBotTest.main(CodeBotTest.java:7)

The second time you run your program, it should print out the following message:

File Hello.java already exists.

If you want to generate the output in the sample run above again, you need to delete the

files -

Hello.java & Hello2.java

- and re-run your program.