1Z0-803 Question #219: Real Exam Question with Answer & Explanation

Question

Options

• AAssertionError, ArrayIndexOutOfBoundsException, ArithmeticException
• BAssertionError, IOError, IOException
• CArithmeticException, FileNotFoundException, NumberFormatException
• DFileNotFoundException, IOException, SQLException
• EArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException

Explanation

Not B: IOError and IOException are both checked errors. Not C, not D, not E: FileNotFoundException is a checked error. Checked exceptions: - represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files) - are subclasses of Exception - a method is obliged to establish a policy for all checked exceptions thrown by its implementation (either pass the checked exception further up the stack, or handle it somehow) Unchecked exceptions: - represent defects in the program (bugs) - often invalid arguments passed to a non-private method. To quote from The Java Programming Language, by Gosling, Arnold, and Holmes: "Unchecked runtime exceptions represent conditions that, generally speaking, reflect errors in your program's logic and cannot be reasonably recovered from at run time." - are subclasses of RuntimeException, and are usually implemented using IllegalArgumentException, NullPointerException, or IllegalStateException - method is not obliged to establish a policy for the unchecked exceptions thrown by its implementation (and they almost always do not do so)

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