Exercise 4: Creating a Simple Bank Package (Level 1 & 2)

Exercise 4: Creating a Simple Bank Package (Level 3)

In this exercise, you will create a development environment for the Banking project with src and classes directories. You will also place the Account class and TestAccount program into packages. These are the level 3 instructions, which provide additional hints with code snippets.

Preparation

There is no preparation for this exercise.

Task 1 - Creating the Development Directories

Create the development environment directories for the source and class files as described in "Development" on slide 22 of Module 2.

mkdir src\com\mybank\domain
mkdir src\com\mybank\test
mkdir classes

Task 2 - Modifying the `Account` Class

Using a text editor, modify the Account.java source file and place the class in the appropriate package. Add the following statement to the top of the Account.java source file:

package com.mybank.domain;

Move the Account.java source file into the appropriate development subdirectory.

move Account.java src\com\mybank\domain

Task 3 - Modifying the `TestAccount` Program

Using a text editor, modify the TestAccount.java source file, place the program in the appropriate package, and include the appropriate imported classes. Add the following package and import statements to the top of the TestAccount.java source file:

package com.mybank.test;
import com.mybank.domain.Account;

Move the TestAccount.java source file into the appropriate development subdirectory.

move TestAccount.java src\com\mybank\test

Task 4 - Cleaning Up the Project Directory

Remove all class files and any backup files created by your text editor.

del *.class

Task 5 - Compiling the TestAccount Program

On the command line, use the javac command to compile the test program and the Account class

cd src
javac -d ../classes com/mybank/test/TestAccount.java
.

Task 6 - Running the TestAccount Program

On the command line, use the java command to run the test program.

javac -classpath ../classes com.mybank.test.TestAccount

The code has not changed, so you should still see the following output:

The final balance is 147.0