Java, A Beginner's Guide, 5th Edition, 5th Edition

A Closer Look at Throwable

Up to this point, we have been catching exceptions, but we haven’t been doing anything with the exception object itself. As the preceding examples all show, a catch clause specifies an exception type and a parameter. The parameter receives the exception object. Since all exceptions are subclasses of Throwable, all exceptions support the methods defined by Throwable. Several commonly used ones are shown in Table 9-1.

Table 9-1 Commonly Used Methods Defined by Throwable

 

Of the methods defined by Throwable, two of the most interesting are printStackTrace( ) and toString( ). You can display the standard error message ...