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Java Demystified
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In order to run a program from the command line and pass it command-line arguments, you ll need to display a command line on the screen You do this in Windows by selecting Start | Programs | Accessories | Command Prompt in many versions of Windows We ll use the example in the previous section to illustrate how to pass a commandline argument Type the following on the command line and press ENTER to run the program:
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Here s what is happening: The first word, java, is used to run the Java Virtual Machine The second word, demo, is the name of the Java program, which is the program shown in the previous section The third word, Amber, is the commandline argument When you press ENTER, your operating system runs the Java Virtual Machine and passes it the name of your program and the command-line argument The Java Virtual Machine then uses the command-line argument as it executes your program You can pass multiple command-line arguments to your program by typing them on the command line and separating them with a space Arguments are assigned to the args array in the order in which those arguments appear on the command line For example, the first argument is assigned to the first array element, the second argument is assigned to the second array element, and so on The following command line shows you how to use multiple command-line arguments Notice there are two command-line arguments: Amber and Joanne When the program runs, Amber is assigned to args[0] and Joanne is assigned to args[1]
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There might be an occasion when you need to pass a command-line argument that consists of two or more words, such as Amber Leigh There s a problem These words are separated by a space, which will confuse Java because it interprets these words as two command-line arguments instead of as one command-line argument The solution to this problem is to place all the words that comprise the commandline argument within double quotation marks This causes Java to interpret the space as part of the argument rather than the beginning of a new argument The following command line illustrates how this is done There are two command-line arguments in this example ("Amber Leigh" and Joanne):
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On other occasions, you may want quotation marks to be part of the command-line argument For example, the command-line argument might be "Amber" including the quotation marks The problem is that the operating system shell interprets the
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CHAPTER 6 Methods and Polymorphism
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quotation marks as a signal to make everything between them the command-line argument excluding the quotation marks The solution is to precede each quotation mark with a backslash (\) The backslash tells the operating system shell that the quotation mark is part of the commandline argument The following command-line argument shows you how this works When the program runs, args[0] is assigned "Amber" and args[1] is assigned Joanne
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Calling a Method
Previously in this chapter, you saw how to call a method within a statement You simply use the method name followed by any arguments The arguments must be contained within parentheses Empty parentheses are used if the method doesn t require any arguments You need to consider a number of factors when calling a method We ll discuss those factors in this section The first thing to consider is that Java is case sensitive Therefore, you must be careful to use exactly the name of the method that appears in the method definition when calling it Otherwise, Java will think you want to use a different method, and it will then display a compiler error if that method isn t found Second, make sure you include all the arguments in the method call that are found in the method definition The method call must have the same number of arguments Arguments passed by the method call must be of a data type that is compatible with arguments in the method definition Also, those arguments must appear in the method call in the same order as the arguments appear in the method definition You ll receive a compiler error if there is a mismatch of arguments Some methods return a value; however, the statement that calls the method can ignore the return value without experiencing a compile error Here s a modified version of the example used earlier in this chapter to call a method to calculate a grade:
class Demo { public static void main (String args[]) { float rawTest[] = {70,100}; calcGrade (rawTest); } static float calcGrade (float test[]) { return (test[0]/test[1]) * 100; } }
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