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Java, A Beginner’s Guide, 5th Edition by Herbert Schildt

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The Consequences of an Uncaught Exception

Catching one of Java’s standard exceptions, as the preceding program does, has a side benefit: It prevents abnormal program termination. When an exception is thrown, it must be caught by some piece of code, somewhere. In general, if your program does not catch an exception, then it will be caught by the JVM. The trouble is that the JVM’s default exception handler terminates execution and displays a stack trace and error message. For example, in this version of the preceding example, the index out-of-bounds exception is not caught by the program.

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When the array index error occurs, execution is halted, ...

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