visual basic 2008 barcode generator Passing an Array to a Method in Java

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Passing an Array to a Method
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As you learned in 1, a method is a block of statements that is identified by a unique name You call the name of the method in your program whenever you want to execute those statements Sometimes a method requires data in order to execute those statements That data is provided to the method by the program when the method is called This is called passing data to the method Let s say you have a method that calculates a grade based on the number of correct answers and the number of questions asked on the test This method needs two data elements in order to calculate the grade: the number of correct answers and the total number of questions on the test Both of these are provided to the method by the program that calls the method
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CHAPTER 5 Arrays
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Data required by a method is called an argument that is contained in an argument list An argument list consists of data elements, each represented as data type and name, which is very similar to the way you declare a variable Sometimes a method returns data to the program that called the method This is called a return value For example, the method that calculated the grade probably returns the grade to the program that asked for the grade to be calculated Now that you have an understanding of how a method works, let s see how you can pass an array to a method The first step is to define a method that will receive the array This is shown in the following example:
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class Demo { public static void main (String args[]) { float grade; float rawTest[] = {70,100}; grade = gradeCalc(rawTest); Systemoutprintln("Your grade is: " + grade ); } static float gradeCalc(float test[]) { return (test[0]/test[1]) * 100; } }
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The method is called gradeCalc() and is defined below the main() method The purpose of the gradeCalc() method is to calculate a grade based on the number of responses the student correctly gave on the test and the number of test questions Both these values are stored in elements of an array that is passed to the gradeCalc() method After the calculation is completed, the grade is returned by the gradeCalc() method Let s see how this program works The program begins in the main() method by declaring a float variable and an array called rawTest The array has two array elements that store two float values The first array element is the number of correct answers The second array element is the number of questions on the test Notice that the array is initialized when it is declared The program then calls the gradeCalc() method The gradeCalc() method expects to receive a reference to the array that contains the data necessary to calculate the grade You place the name of the array between parentheses in order to pass an array to a method Let s follow the array into the definition of the gradeCalc() method The argument of the gradeCalc() method consists of float test[] Notice that this doesn t declare the length of an array Instead, it declares a reference to an array,
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which is similar to the reference that is declared when you dynamically declare an array Think of a reference as a pointer to the first address of the block of memory that contains the array It just so happens that the name of an array is also a pointer to the address of the block of memory that contains the array Therefore, the argument is assigned the pointer to the array The gradeCalc() method then uses each element of the array to calculate the grade The result of the calculation is then returned to the statement in the main() method that called the gradeCalc() method The grade returned by gradeCalc() is then assigned to the variable a, which is then displayed on the screen
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