Java: A Beginner’s Guide by Herbert Schildt

Author:Herbert Schildt [Schildt, Herbert]
Language: eng
Format: epub
Publisher: McGraw-Hill
Published: 2012-06-09T07:00:00+00:00

Try Blocks Can Be Nested

One try block can be nested within another. An exception generated within the inner try block that is not caught by a catch associated with that try is propagated to the outer try block. For example, here the ArrayIndexOutOfBoundsException is not caught by the inner catch, but by the outer catch:

In this example, an exception that can be handled by the inner try—in this case, a divide-by-zero error—allows the program to continue. However, an array boundary error is caught by the outer try, which causes the program to terminate.

Although certainly not the only reason for nested try statements, the preceding program makes an important point that can be generalized. Often nested try blocks are used to allow different categories of errors to be handled in different ways. Some types of errors are catastrophic and cannot be fixed. Some are minor and can be handled immediately. Many programmers use an outer try block to catch the most severe errors, allowing inner try blocks to handle less serious ones.

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