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respectively A copy of these values are assigned to the arguments correctAns and totalQuestions by Java The values 70 and 100 appear twice in memory once for the calcGrade() method, and the other for the main() method
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class Demo { public static void main (String args[]) { float a; int b = 70, c = 100; a = calcGrade (b, c); Systemoutprintln("Your grade is: " + a); } static float calcGrade(int correctAns, int totalQuestions) { return (correctAns / totalQuestions) * 100; } }
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Command-Line Arguments
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A command-line argument is data that is passed to your Java program from the command line when you run the program The command line is also called the command prompt (You can display the command prompt in Windows by selecting Start | Programs | Accessories | Command Prompt) Sometimes programmers use a command-line argument to override a default setting in the Java program For example, a Java program might use the system s date as today s date throughout the program unless a date is passed in a command-line argument, which overrides the default date A Java program receives data from the command line in the main() method s argument list You probably noticed the main() method s argument list in examples throughout this book, as shown here:
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void main (String args[])
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The main() method s argument list consists of one argument, which is a reference to an array of String objects called args You ll learn about String objects in 7 For now, think of a String object as one or more words, such as Bob Smith or 121 Main Street As you ll recall from the previous chapter, a reference to an array isn t an array Instead, it is something that points to the memory address that contains the first element of the array Data passed to a program is placed in memory, and the memory address of the first data element is assigned to the args reference You ve seen this done previously in this chapter when an array is passed to a method
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CHAPTER 6 Methods and Polymorphism
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The number of data elements placed on the command line determines the number of array elements in the args array You can determine the number of array elements by using the length member of the array, which you learned about in the previous chapter The following example will refresh your memory on how this is done:
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class Demo { public static void main (String args[]) { Systemoutprintln(" The number of command line arguments is: } }
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" + argslength);
Data passed on the command line is assigned to each of the args array elements, and you can access that data from within your program by referencing the array element the same way you reference any array element (see 5) Let s see how this is done The following example begins by determining whether there are any command-line arguments If there aren t any, an appropriate message is displayed If there are, a for loop is used to display each element of the array pointed to by the args reference
class Demo { public static void main (String args[]) { if ( argslength > 0) { for (int x = 0; x < argslength; x++) { Systemoutprintln( "Command line argument " + x + " : " + args[x]); } } else { Systemoutprintln( "There are no command line arguments"); } } }
Passing Command-Line Arguments
Now that you know how to use command-line arguments within your program, let s turn our attention to how arguments are passed from the command line to your program If you are using Windows, you may not have had the opportunity to use the command line because many programs running in Windows are started by doubleclicking an icon or selecting the program from a menu
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