visual basic 2008 barcode generator The Argument List in Java

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The Argument List
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Now that you know how to define a method, let s take a closer look at the method argument list Previously you learned that some methods require data in order to perform a task and that the data is supplied by the statement that calls the method This data is referred to as an argument and is passed to a method in the form of an argument list Think of an argument list as the collection of data a method needs to perform a task The statement that calls the method places data between the parentheses of the method call, as shown in this example, which passes two integer literals to the calcGrade() method defined in the previous section of this chapter:
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calcGrade(70, 100)
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Some programmers call data passed to a method a parameter list Each data element in the parameter list is referred to as a parameter Therefore, 70 and 100, collectively, comprise the parameter list, and each is a parameter Other programmers use
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CHAPTER 6 Methods and Polymorphism
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the terms argument list and arguments as synonymous for parameter list and parameters We ll use the terms argument list and arguments throughout this book You have three things to remember when using an argument list First, the data passed to a method by the statement must be compatible with the data type of the method s argument list, as specified in the method definition Second, the order in which data is passed to a method must be the same order as the method s argument list Third, you must pass the method the correct number of arguments That is, the number of arguments in the argument list in the method definition must be the same as the number of data elements passed to the method Failure to do these three things might result in a compiler error or cause the method to process erroneous data For example, switching the position of the data passed to the calcGrade() method results in the method calculating an erroneous grade
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Elements of an Argument List
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An argument list consists of two elements: the argument data type and the argument name An argument data type is the same as a data type of a variable It tells Java the amount of memory to reserve for the argument and the kind of data that will be stored there An argument name is similar to a variable name It is an alias for the memory address that contains the data passed by the statement that calls the method You use the argument name within the method the same as you use a variable name
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How an Argument List Works
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Before data is passed to a method, it is stored in memory When the method is called, Java allocates memory based on the data types of the arguments specified in the method definition Java then makes available to the method the data passed by the statement that called the method Data is made available to a method in two way: pass by value and pass by reference Pass by value makes a copy of the data available to the method That is, Java makes a copy of the data passed to the method and stores the copy in memory that is allocated for the argument Statements with the method can change the value of the data passed to it, but that change isn t available to the statement that called the method because each has its own copy of the data The following is an example of how data is passed by value to a method This example declares three ints One stores the value returned by the method, and the other two store values passed to the method, which are initialized to 70 and 100,
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