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Prepare the library for use
Once you have downloaded the zip file, you will need to extract the folder named bookClasses from the zip file and store it somewhere on your computer's disk.
Library documentation
When you examine the contents of the bookClasses folder, you will see that in addition to source code and compiled class files for thelibrary, the folder also contains javadoc documentation for the library in afolder named doc and some other material as well. Go to the doc folder and open the file named index.html in your browser to view the documentation.
Put the library on the classpath
You will need to put the path to the bookClasses folder on your classpath in order to incorporate classes from the library into yourprograms.
| Figure 4 . Putting the library on the classpath. |
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del *.class
javac -cp .;M:\bookClasses *.javajava -cp .;M:\bookClasses Prob01 |
Figure 4 shows three commands that you can execute at a Windows command prompt to
The commands shown in Figure 4 assume that the bookClasses folder is in the root directory on the M-drive. The bookClasses folder will likely be in a different location on your computer. They also assume thatyou are compiling and running a program having its main method in a class named Prob01 in a file named Prob01.java .
Be sure to include the period and the semicolon shown before the M in Figure 4 . This tells the Java compiler and the Java Virtual Machine to search first in the current folder before searching elsewhere on the disk for the required files.
You can also put the three commands in a batch file and run the batch file to avoid having to type the three commands each time you need to compile and runthe program. In that case, you should add a pause command following the other three commands.
Note that this batch file must be placed in the same folder that contains the file named Prob01.java , and that folder must be your "current directory. DO NOT attempt to execute the commands shown in Figure 4 from inside the bookClasses folder."
If you are using an IDE such as DrJava, JCreator, or JGrasp, see the instructions for the IDE to learn how to set the classpath in the IDE.
It is often useful to have the code for a simple program to test your system. This section presents two versions of the classical Hello World program. The first version is a simple text version that doesn't use Ericson's library.This version can be used to confirm that the Java Development Kit (JDK) is properly installed on your computer.
The second version is a graphic version that does require Ericson's library.This version can be used to confirm proper installation and use of the library.
The simple program shown in Listing 1 causes the words Text Hello World to be displayed on the standard output device when the program is compiled andexecuted.
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