Compiler Preferences:

Menu:

Edit - Reset to last default values:
This will change the entries in the window to the current default values.

Edit - Save as default values:
This will make the current values specified in the window the default values.

Compiler Options:

These options are the same as for the basic java compiler in your JDK. Read the correspondig section in your JDK documentation for further information.

Error Options:

Show all errors:
All errors encountered by the java compiler will be sent to the error table in the compile window.

Show one error per class:
Only one error per class will be put into the error table.

Show only one error:
Only one single error will be put into the error table. Compilation will stop after the first compilation error is reported by the compiler.

Classpath:

Using this editable list, you set the classpath for the current project. Use '+', '-' and the arrows to add and delete data or to change the position in the list. If you open the context menu, you'll get other options:

Sort:
Sorts the list alphabetically.

Clear:
Empties the list.

Add using file requester:
Pops up a file chooser which lets you select a file on your hard disk.

Add using package requester:
Pops up a dialog containing all the classpath entries in your system's default classpath.