The jdb Debugger
jdb, the Java debugger, is a sophisticated tool that helps you find and fix bugs in Java programs. You can also use it to understand better what is taking place behind the scenes in the Java interpreter as a program is running. It has a large number of features, including some that might be beyond the expertise of a Java programmer who is new to the language.
You don't need to use the debugger to debug Java programs. This is fairly obvious, especially if you've been creating your own Java programs as you read this book. After the Java compiler generates an error, the most common response is to load the source code into an editor, find the line cited in the error message, and try to spot the problem. This dreaded compile-curse-find-fix ...
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