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The Java Lesson 3: Identifiers and primitive data types
Wednesday, February 11, 2004 (00:00:00)
Posted by jalex
1. Identifiers in Java | 2. Primitive data types in Java
Identifiers and primitive data types
Uses of identifiers
To name a variable (a data area
that takes on different values during processing)
To name a method (a module of
To name a class (a definition
from which objects can be constructed)
To label a statement (for later
Rules for identifiers
It must not be a
It must begin with a letter,
dollar sign ( $ ), or
underscore ( _ )
Subsequent characters may be
letters, dollar signs, underscores, or digits
Case matters. For example, the
three identifiers MAIN,
Main, and main are different.
Examples of valid
Are not enforced by the
compiler but make it easier to read and maintain Java code
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).
Begin variable names, method
names, and labels with a lower case letter. For example, totalAmount, hoursWorked, employeeName, calcBonus, and main.
Begin class names with a
capital letter. For example, Person, Customer, SalesRep, and Part.
Names of constants should be
all capitals. For example, TAX_RATE, COMMISSION, and DEPOSIT_CODE.