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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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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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Thrown exceptions are like returned arguments and are for instance part of interface to a method
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Exceptions are all (at some level in hierarchy) subclasses of Throwable class
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method1 {
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try {
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} catch (Exception3 e) {
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}
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}
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method2 throws Exception3 {
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}
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method3 throws Exception3 {
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call dividebyzeroorreadfileorsomething;
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}
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