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The keywords const and goto are reserved but not used In the early days of Java, several other keywords were reserved for possible future use However, the current specification for Java only defines the keywords shown in Table 2-1 In addition to the keywords, Java reserves the following: true, false, and null These are values defined by Java You may not use these words for the names of variables, classes, and so on
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The sample programs shown in this chapter make use of two of Java s built-in methods: println( ) and print( ) As mentioned, these methods are members of the System class, which is a class predefined by Java that is automatically included in your programs In the larger view, the Java environment relies on several built-in class libraries that contain many built-in methods that provide support for such things as I/O, string handling, networking, and graphics The standard classes also provide support for windowed output Thus, Java as a totality is a combination of the Java language itself, plus its standard classes As you will see, the class libraries provide much of the functionality that comes with Java Indeed, part of becoming a Java programmer is learning to use the standard Java classes Throughout Part I of this book, various elements of the standard library classes and methods are described as needed In Part II, the class libraries are described in detail
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Data Types, Variables, and Arrays
his chapter examines three of Java s most fundamental elements: data types, variables, and arrays As with all modern programming languages, Java supports several types of data You may use these types to declare variables and to create arrays As you will see, Java s approach to these items is clean, efficient, and cohesive
Java Is a Strongly Typed Language
It is important to state at the outset that Java is a strongly typed language Indeed, part of Java s safety and robustness comes from this fact Let s see what this means First, every variable has a type, every expression has a type, and every type is strictly defined Second, all assignments, whether explicit or via parameter passing in method calls, are checked for type compatibility There are no automatic coercions or conversions of conflicting types as in some languages The Java compiler checks all expressions and parameters to ensure that the types are compatible Any type mismatches are errors that must be corrected before the compiler will finish compiling the class
The Primitive Types
Java defines eight primitive types of data: byte, short, int, long, char, float, double, and boolean The primitive types are also commonly referred to as simple types, and both terms will be used in this book These can be put in four groups:
Integers This group includes byte, short, int, and long, which are for whole-valued signed numbers Floating-point numbers This group includes float and double, which represent numbers with fractional precision
Part I:
The Java Language
Characters This group includes char, which represents symbols in a character set, like letters and numbers Boolean This group includes boolean, which is a special type for representing true/false values
You can use these types as-is, or to construct arrays or your own class types Thus, they form the basis for all other types of data that you can create The primitive types represent single values not complex objects Although Java is otherwise completely object-oriented, the primitive types are not They are analogous to the simple types found in most other non object-oriented languages The reason for this is efficiency Making the primitive types into objects would have degraded performance too much The primitive types are defined to have an explicit range and mathematical behavior Languages such as C and C++ allow the size of an integer to vary based upon the dictates of the execution environment However, Java is different Because of Java s portability requirement, all data types have a strictly defined range For example, an int is always 32 bits, regardless of the particular platform This allows programs to be written that are guaranteed to run without porting on any machine architecture While strictly specifying the size of an integer may cause a small loss of performance in some environments, it is necessary in order to achieve portability Let s look at each type of data in turn
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