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Write code that proves a short-circuit operator is short-circuiting, and that a non-short-circuit operator isn t short-circuiting Write code that determines whether the integer value of args[0] is evenly divisible by the integer value of args[1] Write code that uses a ternary operator to populate a String with either success or failure based on whether args[0] can be parsed to an int Write code that demonstrates how postfix operators affect loop operations differently than prefix operators Write a program that adds two name-value pairs to javautil Properties: one pair via a command-line option and one via a method in Properties Next, print all the system s properties to verify that the two new properties were added Although difficult to prove, write code that creates instances of a class that are referred to by other instances, and yet are still eligible for garbage collection Create a class that has a method such that the first time the garbage collector attempts to collect a given instance, this method will keep the garbage collector from collecting that instance at that point Create code that passes primitives and reference variables into methods, demonstrating how pass by value works for primitives and reference variables Although not strictly on the exam, create a class and put it in a JAR file Create a second class that uses the class in the JAR file Write a class that uses a static import Write a class that lives in a package Write another class in another package that successfully uses methods from the first class

my $var; our $var; local $var;

If you want to specify more than one variable, then supply the names in parentheses,

my ($var, @var, %var);

34 Given:

and if you want to assign a value as well,

my ($var, $string) = (1,'hello');

If you forget to use parentheses, you get some strange effects:

2 3 4 5 6 7 8 9 10 11 12 public class Organic<E> { void react(E e) { } static void main(String[] args) { // Organic< extends Organic> compound = new Aliphatic<Organic>(); // Organic< super Aliphatic> compound = new Aliphatic<Organic>(); compoundreact(new Organic()); compoundreact(new Aliphatic()); compoundreact(new Hexane()); } } class Aliphatic<F> extends Organic<F> { } class Hexane<G> extends Aliphatic<G> { }

my $var, $string = 1,'hello';

The preceding line actually works like this:

6:

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Which, taken independently, are true (Choose all that apply) A If line 5 is uncommented, compilation fails due to an error at line 7 B If line 5 is uncommented, compilation fails due to an error at line 8 C If line 5 is uncommented, compilation fails due to an error at line 9 D If line 6 is uncommented, compilation fails due to an error at line 7 E If line 6 is uncommented, compilation fails due to an error at line 8 F If line 6 is uncommented, compilation fails due to an error at line 9 35 Given:

my $var; $string = 1; 'hello';

If you have warnings switched on, then you ll get an error, because the 'hello' is actually interpreted in a void context (since it doesn t actually do anything) In general, you ll see and use my more than other declarations, because it generally does what you expect when you declare variables in this way The our declaration is a relatively new invention (it was only introduced in Perl 56), and it allows you to declare a variable as being global and potentially usable by any other subroutine defined in your script Both my and our are examples of lexically scoped variables the difference is in the level at which the lexical scope is applied The local variable is really a dynamically scoped variable it effectively creates a copy of a global variable within the current scope It operates just like a lexically scoped variable; its effects disappear when the variable goes out of the current scope, with the variable returning to its original value instead of simply disappearing We ll look at the specific effects of each declaration in the following sections

Although the previous script will not display a visible error message, script execution will still stop at the point of error and statements subsequent to that point will not be executed (possibly leaving the user facing a blank screen) All error_ reporting() does is permit control over which errors are displayed; it doesn t prevent them from being generated in the first place It must also be noted that suppressing the display of fatal errors, as with E_NONE in the previous listing, is a Bad Thing It is poor programming practice to hide and ignore errors in this manner; it is far better and more professional to anticipate the likely errors ahead of time, and write defensive code that watches for them and handles them appropriately

The my keyword declares a variable to be scoped within the current block For the duration of the block, the new variable will take precedence over any previously scoped variable When the block ends, the variable goes out of scope You can easily demonstrate this with this script:

my $string = "We are the world"; print "$string\n"; myfunction(); print "$string\n"; sub myfunction { my $string = "We are the function"; print "$string\n"; mysub(); } sub mysub { print "$string\n"; }

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