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Two-Minute Drill
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TWO-MINUTE DRILL
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Here are some of the key points from each certification objective in 4. You might want to loop through them several times, but only if you re interested in passing the exam.
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Writing Code Using if and switch Statements The if statement must have all expressions enclosed by at least one pair of
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parentheses.
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The only legal argument to an if statement is a boolean, so the if test can be
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only on an expression that resolves to a boolean or a boolean variable.
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Watch out for boolean assignments (=) that can be mistaken for boolean
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equality (==) tests:
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boolean x = false; if (x = true) { } // an assignment, so x will always be true!
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Curly braces are optional for if blocks that have only one conditional
statement. But watch out for misleading indentations.
Switch statements can evaluate only the byte, short, int, and char
data types. You can t say
long s = 30; switch(s) { }
The case argument must be a literal or final variable! You cannot have
a case that includes a non-final variable, or a range of values.
If the condition in a switch statement matches a case value, execution will run
through all code in the switch following the matching case statement until a break or the end of the switch statement is encountered. In other words, the matching case is just the entry point into the case block, but unless there s a break statement, the matching case is not the only case code that runs.
The default keyword should be used in a switch statement if you want
to execute some code when none of the case values match the conditional value.
The default block can be located anywhere in the switch block, so if no case
matches, the default block will be entered, and if the default does not contain a break, then code will continue to execute (fall-through) to the end of the switch or until the break statement is encountered.
4: Flow Control, Exceptions, and Assertions
Writing Code Using Loops A for statement does not require any arguments in the declaration, but has
three parts: declaration and/or initialization, boolean evaluation, and the iteration expression.
If a variable is incremented or evaluated within a for loop, it must be declared
before the loop, or within for loop declaration.
A variable declared (not just initialized) within the for loop declaration cannot
be accessed outside the for loop (in other words, code below the for loop won t be able to use the variable).
You can initialize more than one variable in the first part of the for loop
declaration; each variable initialization must be separated by a comma.
You cannot use a number (old C-style language construct) or anything that
does not evaluate to a boolean value as a condition for an if statement or looping construct. You can t, for example, say:
if (x) unless x is a boolean variable.
The do-while loop will enter the body of the loop at least once, even if the
test condition is not met.
Using break and continue An unlabeled break statement will cause the current iteration of the
innermost looping construct to stop and the next line of code following the loop to be executed.
An unlabeled continue statement will cause the current iteration of the
innermost loop to stop, and the condition of that loop to be checked, and if the condition is met, perform the loop again.
If the break statement or the continue statement is labeled, it will
cause similar action to occur on the labeled loop, not the innermost loop.
If a continue statement is used in a for loop, the iteration statement is
executed, and the condition is checked again.
Catching an Exception Using try and catch Exceptions come in two flavors: checked and unchecked.
Two-Minute Drill
Checked exceptions include all subtypes of Exception, excluding classes that
extend RuntimeException.
Checked exceptions are subject to the handle or declare rule; any method that
might throw a checked exception (including methods that invoke methods that can throw a checked exception) must either declare the exception using the throws keyword, or handle the exception with an appropriate try/catch.
Subtypes of Error or RuntimeException are unchecked, so the compiler
doesn t enforce the handle or declare rule. You re free to handle them, and you re free to declare them, but the compiler doesn t care one way or the other.
If you use an optional finally block, it will always be invoked, regardless
of whether an exception in the corresponding try is thrown or not, and regardless of whether a thrown exception is caught or not.
The only exception to the finally-will-always-be-called rule is that a finally
will not be invoked if the JVM shuts down. That could happen if code from the try or catch blocks calls System.exit(), in which case the JVM will not start your finally block.
Just because finally is invoked does not mean it will complete.
Code in the finally block could itself raise an exception or issue a System.exit().
Uncaught exceptions propagate back through the call stack, starting from
the method where the exception is thrown and ending with either the first method that has a corresponding catch for that exception type or a JVM shutdown (which happens if the exception gets to main(), and main() is ducking the exception by declaring it).
You can create your own exceptions, normally by extending Exception or one
of its subtypes. Your exception will then be considered a checked exception, and the compiler will enforce the handle or declare rule for that exception.
All catch blocks must be ordered from most specific to most general.
For example, if you have a catch clause for both IOException and Exception, you must put the catch for IOException first (in order, top to bottom in your code). Otherwise, the IOException would be caught by catch(Exception e), because a catch argument can catch the specified exception or any of its subtypes! The compiler will stop you from defining catch clauses that can never be reached (because it sees that the more specific exception will be caught first by the more general catch).
4: Flow Control, Exceptions, and Assertions
Working with the Assertion Mechanism Assertions give you a way to test your assumptions during development and
debugging.
Assertions are typically enabled during testing but disabled during deployment. You can use assert as a keyword (as of version 1.4) or an identifier, but
not both together. To compile older code that uses assert as an identifier (for example, a method name), use the -source 1.3 command-line flag to javac.
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