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far by reading the value of Automobile.countOfCars. The dot notation says to return the value of countOfCars from the Automobile class. The most common use of static variables is for class constants. If you read the Javadoc for the class StreamTokenizer, for example, you will see a set of four class constants that are declared static. These constants are TT_EOF, TT_EOL, TT_NUMBER, and TT_WORD. These constants represent the possible values (the token types) that a StreamTokenizer will return when it extracts a token (a String, a number, or an EndOfFile/EndOfLine flag) from an InputStream. Another example from Java is the class Color, which defines a long list of static constants used to represent commonly used colors. Aside from using static variables for class constants, it is generally wise to avoid static variables unless you have a special reason to use them (as, for example, a need to keep a count of all the objects created). The reason is that, typically, many objects can modify a static variable, and over time the probability of some new class taking such liberties will grow. Discovering the cause of unexpected behavior related to static variables can be difficult. Static methods likewise are associated with a class as a whole, and are accessible from any object simply by referencing the class name that provides the static method. For instance, the Java class Integer has a set of static methods related to integer numbers. One is the static method Integer.valueOf(String), which returns a Java Integer object when passed a String that properly represents an integer number. The Java Math class provides many more examples of static methods. Any object can take advantage of the static methods in the Math class to compute a transcendental function, square root, log, etc. The object using the routine must simply reference the class name, followed by the dot notation, and the name of the static method; for example, Math.sqrt(X) will return the square root of X. Unless there is a special reason to do so, such as providing a library of functions as the Math class does, it is better practice to avoid static methods. The reason is the same as for static variables; the shared code provides more opportunity for unexpected side effects to occur. The exception to this rule is the Java program s main() method. The JVM must find a public static method called main in the class being executed. Visual Basic .NET uses the term shared instead of static, and the word shared is a better description of the concept. The term static has been used in several ways in different programming languages. For instance, a static variable in a C procedure (C is a procedural language, not an OO language) is one whose address does not change between executions of the procedure. While other variables in the procedure get pushed onto and popped off the stack dynamically, a static variable in C gets allocated to a fixed memory location, and so the address associated with the variable name remains static. Static variables in C are used for things like counters, when one must keep track of the number of times a procedure has been executed. A static variable will allow the count to persist between calls to the procedure. For OO programming, and specifically for Java, think of static members as shared members. Static members are accessible to all. Understand how they differ from instance members, and use static members only when they satisfy a need that a corresponding instance member cannot. SCRIPTING LANGUAGES Today there is a large set of programming languages collectively referred to as scripting languages. The original idea of a script was a set of operating system commands placed in a file. When a user executes the script file, the set of commands in the file is executed in order. This notion of a script is still heavily used. Scripts are very useful for automating routine tasks which otherwise would require a person to sit at a keyboard and type the same commands again and again. Here is an example from the author s experience. This script is for a Unix computer. The script runs a grading program against an output file for a student s project, then runs the student s original program against a smaller extract file as a second test, and finally prints a set of documents for the student. The script automates the execution of a set of commands by accepting a set of parameters in the command line, and then using the values of those variables to construct the appropriate commands and execute them. When using the script, the user types gradeP followed by six character strings giving the name of the student s output file, the comments file to be created, etc., and at last the student s name:
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