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The language itself supports concept of an exception
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| 2 |
Java supports a hierarchical model of exceptions which allow and indeed require user to supply suitable handlers for any exception that can occur in a Java program
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| 3 |
Note exceptions that can occur in a method must either be caught (i.e. handled inside method) or thrown (i.e. returned to callee)
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| 4 |
Thrown exceptions are like returned arguments and are for instance part of interface to a method
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| 5 |
Exceptions are all (at some level in hierarchy) subclasses of Throwable class
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