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The third JDK 5.0 annotation is @Override. Use of this annotation tells the compiler that the method is supposed to be overriding a method in the superclass. The compiler will warn you if it doesn t. This will catch common mistakes, such as a method with the wrong case for example, hashcode() versus hashCode(). In such a case, a quick scan through the code may look right, and the compiler won t complain at compilation time. Only after your resultant program produces odd results when hashCode() should be called does the problem of the incorrect case in your method reveal itself. Well, it doesn t exactly reveal itself, but you know something is wrong, and you have to hunt down the problem. By using the annotation, errors of this nature will be caught much sooner in the development process. Listing 10-3 shows a program with a poorly overridden method.

General Default, same as General Fixed Point, 4 dec places Currency Sci. Notation, 3 dec places Hexadecimal integer

The Regional and Language Options applet of the Windows Control Panel can affect the resulting formats of some of the specifiers. For example, the currency symbol of the country or region specified will be used by the currency format specifier. Table 25-2 summarizes the nine standard numeric format specifiers. The first column lists the name of the specifier followed by the specifier characters. If the specifier characters have different output depending on their case, they are marked case sensitive. Table 25-2. Standard Numeric Format Specifiers

public class Over { public void overrideMe() { } } class SubOver extends Over { @Override public void overrideme() { } }

A repetition is described with the appended label for every, followed by a condition. for every: Print Control \= Double Space; access: Report Original Line

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Formats the value as a currency, using a currency symbol. Precision specifier: The number of decimal places. Sample: Console.WriteLine("{0 :C}", 12.5); Output: $12.50

Notice the poorly capitalized method without camelcase for the m in me. Had the source code not included the @Override annotation, the compiler would not have complained, producing a SubOver class with an overrideme() method. Any call to the overrideMe() method of SubOver would then result in the version in the parent class being called instead.

A string of decimal digits, with a negative sign, if appropriate. Can be used only with integral types. Precision specifier: The minimum number of digits to use in the output string. If the number has fewer digits, it will be padded with 0s on the left. Sample: Console.WriteLine("{0 :D4}", 12); Output: 0012

Instead of a resource access, the Rrepetitions notation can be an arithmetic operator and incrementation amount or a nonreturn interval reference. for every: Column Counter \> Line Width; source: Column Counter + 1

A string of decimal digits with a decimal point. Can also include a negative sign, if appropriate. Precision specifier: The number of decimal places. Sample: Console.WriteLine("{0 :F4}", 12.3456789); Output: 12.3457

However, because of the @Override, you learn at compile time that there are problems, as shown in the following snippet:

A compact fixed-point representation or a scientific notation representation, depending on the value. This is the default, if no specifier is listed. Precision specifier: Depends on the value. Sample: Console.WriteLine("{0 :G4}", 12.3456789); Output: 12.35

Specific usages and incrementations can have immediate follow-up steps. Each of these starts with the keyphrase follow up. component: Source Code; source: Empty Layout Message; for: Source Code = Not Written follow up; part: Source Code

> javac Over.java Over.java:6: method does not override a method from its superclass @Override ^ 1 error

A string of hexadecimal digits. The hex digits A through F will match the case of the specifier. Precision specifier: The minimum number of digits to use in the output string. If the number has fewer digits, it will be padded with 0s on the left. Sample: Console.WriteLine("{0 :x}", 180026); Output: 2bf3a

Similar to fixed-point representation, but includes separators between each group of three digits, starting at the decimal point and going left. Precision specifier: The number of decimal places. Sample: Console.WriteLine("{0 :N2}", 12345678.54321); Output: 12,345,678.54

Thus, you can fix the problem sooner and more cheaply because it is identified much earlier in the process.

Status monitoring has two forms: single statement monitoring and multiple statement monitoring. The multiple form starts with the keyphrase monitor on for an on or the keyphrase monitor off for an off, and the single form starts with the keyphrase monitor next. These keyphrases can be the keywords on, off, and next, respectively. monitor next; part: Unexpected End of File; for: status = End of File and on; part: Unexpected End of File; for: End of File and off; for: End of File

A string that represents percent. The number is multiplied by 100. Precision specifier: The number of decimal places.

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