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1000 Java Tips ebook
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Easy Learn Java: Programming Articles, Examples and Tips - Page 167
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1060 Stories (530 Pages, 2 Per Page)
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The Java Lesson 3: Identifiers and primitive data types
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1. Identifiers in Java | 2. Primitive data types in Java
Identifiers and primitive data types
Uses of identifiers
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To name a variable (a data area
that takes on different values during processing)
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To name a method (a module of
code)
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To name a class (a definition
from which objects can be constructed)
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To label a statement (for later
referencing)
Rules for identifiers
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It must not be a
Java keyword
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It must begin with a letter,
dollar sign ( $ ), or
underscore ( _ )
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Subsequent characters may be
letters, dollar signs, underscores, or digits
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Case matters. For example, the
three identifiers MAIN,
Main, and main are different.
Examples of valid
identifiers
yearlyGrossPay
_2002_Budget
JuneActual
$totalAmtDue
Programming
conventions
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Are not enforced by the
compiler but make it easier to read and maintain Java code
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Most programmers use "camel
caps" (such as firstQuarterSalesTotal) to handle long identifiers that appear
to contain multiple words. Some use undercores (like first_Quarter_Sales_Totals).
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Begin variable names, method
names, and labels with a lower case letter. For example, totalAmount, hoursWorked, employeeName, calcBonus, and main.
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Begin class names with a
capital letter. For example, Person, Customer, SalesRep, and Part.
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Names of constants should be
all capitals. For example, TAX_RATE, COMMISSION, and DEPOSIT_CODE.
16 comments |   | Score: 4
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Posted by jalex on Wednesday, February 11, 2004 (00:00:00) (23053 reads)
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