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Note that we give the initial value 0 to both sum and count The value 0 has type int, which means that the implementation must convert it to type double in order to use it to initialize sum We could have avoided this conversion by initializing sum to 00 instead of 0, but it makes no practical difference in this context: Any competent implementation will do the conversion during compilation, so there is no run-time overhead, and the result will be exactly the same In this case, what's more important than the conversion is that we give these variables an initial value at all When we do not specify an initial value for a variable we are implicitly relying on default-initialization The initialization that happens by default depends on the type of the variable For objects of class type, the class itself says what initializer to use if there is not one specified For example, we noted in 11/10 that if we do not explicitly initialize a string, then the string is implicitly initialized to be empty No such implicit initialization happens for local variables of built-in type Local variables of built-in type that are not explicitly initialized are undefined, which means that the variable's value consists of whatever random garbage already happens to occupy the memory in which the variable is created It is illegal to do anything to an undefined value except to overwrite it with a valid value Many implementations do not detect the violations of this rule, and allow access to undefined values The result is almost always a crash or a wrong result, because whatever is in memory by happenstance is almost never a correct value; often it is a value that is

the foo property is assigned in the init target; and once assigned, it cannot be modified (the exception to this rule is the <antcall> task see Section 1915, <antcall> task, on page 706) Unfortunately, multiple assignments are quietly ignored and thus are quite a source of confusion

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To make a class immutable, follow these five rules: 1 Don't provide any methods that modify the object (known as mutators) 2 Ensure that no methods may be overridden This prevents careless or malicious subclasses from compromising the immutable behavior of the class Preventing method overrides is generally done by making the class final, but there are alternatives that we'll discuss later 3 Make all fields final This clearly expresses your intentions in a manner that is enforced by the system Also, it may be necessary to ensure correct behavior if a reference to a newly created instance is passed from one thread to another without synchronization, depending on the results of ongoing efforts to rework the memory model [Pugh01a] 4 Make all fields private This prevents clients from modifying fields directly While it is technically permissible for immutable classes to have public final fields containing primitive values or references to immutable objects, it is not recommended because it precludes changing the internal representation in a later release (Item 12) 5 Ensure exclusive access to any mutable components If your class has any fields that refer to mutable objects, ensure that clients of the class cannot obtain references to these objects Never initialize such a field to a client-provided object reference nor return the object reference from an accessor Make defensive copies (Item 24) in contructors, accessors, and readObject methods (Item 56) Many of the example classes in previous items are immutable One such class is PhoneNumber in Item 8, which has accessors for each attribute but no corresponding mutators Here is a slightly more complex example:

Buildfile: mutability_test_1xml init: [echo] [echo] test: [echo] [echo]

This document is created with the unregistered version of CHM2PDF Pilot invalid for the type Had we not given either sum or count an initial value, our program most likely would have failed The reason is that the first thing the program does with these variables is to use their values: The program reads count in order to increment it, and it reads sum in order to add its value to the one we just read By the same token, we do not bother to give an initial value to x, because the first thing we do with it is read into it, thereby obliterating any value we might have given it The only new aspect of the while statement is the form of its condition: // invariant: // we have read count grades so far, and // sum is the sum of the first count grades while (cin >> x) { ++count; sum += x; }

Properties are special in that they can be declared outside the scope of a target A property declared in such a manner is defined before any target is executed and is immutable For example, in the following build script:

<project name="Test" default="test" basedir=""> <property name="foo" value="xyz"/> <target name="test"> <echo message="foo=${foo}"/> <property name="foo" value="abc"/> <echo message="foo=${foo}"/> </target> </project>

We already know that the while loop executes so long as the condition cin >> x succeeds We'll explore the details of what it means to treat cin >> x as a condition in 311/39, but for now, what's important to know is that this condition succeeds if the most recent input request (ie, cin >> x) succeeded Inside the while, we use the increment and compound-assignment operators, both of which we used in 2 From the discussion there we know that ++count adds 1 to count, and that sum += x adds x to sum All that is left to explain is how the program does its output: streamsize prec = coutprecision(); cout

the foo property is assigned its value before the test target is executed, and its value is not changed by the second property task within the test target

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