QUESTION 3:
Can the processor of a computer system directly execute source programs written in Java?
If so, you can still use these notes. Even if you have installed one of those programs you can probably do *exactly* what is described here. Plus, you have a much better editor and several other nice features. But you have to figure out how to use them.
If you have installed a commercial version of the Java software (such as JBuilder or Symantec Cafe) you will have a better environment than the one assumed here; read your software's documentation on how to use it. As part of your commercial software, you will probably automatically have the Java tools discussed in this chapter, so you can do exactly what is suggested here.
After installing Java (either from a CD or from a downloaded file) you will sometimes need to change the PATH environment variable of Windows NT, Windows 95, and Windows 98. The site at java.sun.com documents the needed changes.
If you have neither the Java Development Kit nor commercial software installed on your computer you can certainly read these notes, but (of course) you will not be able to write and run any Java code. Some of the pages in future chapters have sample programs written in JavaScript, a Java-like language that many web browsers can interpret. Other pages have interactive Java applets. However, for the best use of these notes, get a Java system and try out some of the programs.
Can the processor of a computer system directly execute source programs written in Java?