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CHAPTER 5 Arrays
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control variable For each turn around the loop, the control variable is typically incremented using the incremental operator A for loop is a perfect way to step through array elements because with each iteration of the for loop, Java is told to move to the next array element The conditional expression is set to evaluate false when the last array element is accessed by Java And to do that, you must include the size of the array in the conditional expression Programmers also call the size of the array, the length of the array You have two ways in which to reference the length of an array You can explicitly place the length into the conditional expression, and you can reference the length data member of the array object Before exploring the length data member, let s examine the explicit way of specifying the length of an array The following example shows how to use a for loop to access each array element Notice that the length of the array is explicitly included in the for loop s conditional expression This example declares an array of three elements Therefore, the length of the array is 3 It also initializes the array
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class demo { public static void main (String args[]) { int myGrades[] = { 90, 70, 80 }; for (int x = 0; x < 3; x++ ) { Systemoutprintln("The value of array element x is " + myGrades[x]); } } }
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The for loop is then used to walk Java through each element of the array, printing the value of each array element on the screen The control variable is used as the index for each array element The for loop continues until the value of x is equal to the length of the array, at which time Java breaks out of the loop and the program ends Now that you have an idea of how to use a for loop to step through elements of an array, let s modify the previous example to use the length data member instead of explicitly placing the length of the array in the conditional expression of the for loop If you are familiar with other programming languages, such as C, you might become a little confused about the length data member, because an array in some programming languages does not have any methods associated with it An array in other programming languages is a collection of variables of a specified data type Java treats an array as an instance of a class, which is called an object You ll learn about classes in 7 For now, think of a class as a cookie cutter that defines data and methods A cookie cutter isn t a cookie Therefore, a class isn t real data and methods That is, memory isn t reserved for the data and methods associated with a class
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When you press a cookie cutter into dough and then remove the cookie cutter, what remains is a real cookie (although you still need to bake it) When you declare an object of a class, what remains is a real object That is, memory is reserved for the data and methods associated with the object of the class Therefore, when you declare an array, Java treats the array as if you declared an object of an array that has data members Later in this chapter, we ll explore the methods associated with an array object An array has data members: the array elements and the length data member The value of the length data member is the length of the array You can reference the length data member in your program any time you need to refer to the length of the array Let s see how this works The next example is a modification of the previous example where the length data member of the array is used in the conditional expression in place of explicitly specifying the length of the array Notice that you use the array name to reference the length data member
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class Demo { public static void main (String args[]) { int myGrades[] = { 90, 70, 80 }; for (int x = 0; x < myGradeslength; x++ ) { Systemoutprintln("The value of array element x is " + myGrades[x]); } } }
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