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CHAPTER 5 Arrays
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import javautil*; class Demo { public static void main(String args[]) { int student1Grades []= new int[3]; student1Grades [0] = 90; student1Grades [1] = 80; student1Grades [2] = 70; int student2Grades []= new int[3]; student2Grades [0] = 90; student2Grades [1] = 80; student2Grades [2] = 70; if (Arraysequals(student1Grades, student2Grades)) Systemoutprintln("Match"); else Systemoutprintln("No Match"); } }
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This example declares two arrays, both containing student grades The equals() method is then called and passed the name of both arrays The value returned by the equals() method becomes the conditional expression for the if statement Remember that statements within an if statement are executed if the conditional expression is true; otherwise, statements within the else statement are executed An appropriate message is displayed on the screen, depending on the value returned by the equals() method Two special things happen in this example because we are using the equals() method The first thing is that the javautil package is imported into the program Many of the packages you ll be using come with your Java compiler Each package is given a name In this example, javautil is the name of the package we re using in this program You must import into your program the package that contains the classes your program uses; otherwise, you ll experience a compiler error This is because Java needs to know the class definition before you can use the class in your program The javautil package contains the definition of the Arrays class, which we use in this example Another special thing that is going on in this example is that the equals() method is called by referencing the name of the Arrays class The class name must precede the member of the class that you want to use in your program, and the class name and the name of the class member must be separated by a period, which is called a dot operator Think of this as telling Java, Use the equals() method that is defined in the Arrays class
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fill()
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The fill() method is a handy tool to use whenever you have to assign an initial value to an array that has a large number of array elements Suppose you ve declared an array of 2,000 integers and, following good programming practice, you decide to initialize each array element to zero Previously in this chapter, you learned the two ways to accomplish this First, you can assign an initial value when you declare the array However, you ll end up with a very long statement consisting of 2,000 zeros Alternatively, you can declare an array that has 2,000 elements and then write 2,000 statements to assign zero to each array element Neither of these options is appealing because both are time consuming and fraught with opportunities for you to make typographical errors The best solution is to have the fill() method assign zero to all those array elements The following example shows how this is done This example declares an array of 2,000 floats The fill() method is then called to initialize each element of the array The fill() method requires two arguments The first argument is the array name, and the second argument is the value that will be assigned to each array element It is critical that the initial value is of a data type that is compatible with the data type of the array; otherwise, you ll receive a compile error After the fill() method is finished, this program displays the value of each array element
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import javautil*; class Demo { public static void main(String args[]) { int studentIDs[] = new int [2000]; Arraysfill(studentIDs, 0); for (int i = 0; i < studentIDslength; i++) Systemoutprintln(studentIDs [i]); } }
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Sometimes you ll have a need to reset the value of a range of array elements rather than the value for the entire array Let s say that after initializing the array of 2,000 student IDs used in the previous example, you replaced the initialized value with real student IDs from a database However, in doing so, you realized that a range of 100 of those student IDs is wrong and must be reset to zero You have three ways of addressing this problem First, you could start over by using the fill() method to reset all the array elements to zero Second, you could manually reset the range of the 100 incorrect IDs to zero Third, you could use
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