visual basic 2008 barcode generator Arrays in Java

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CHAPTER 5 Arrays
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must be compatible with the data type of the array; otherwise, you ll receive a compiler error The binarySearch() method returns an integer The integer can be a positive number or a negative number A positive number represents the index of the array element that contains the search value A negative number means that the search criterion isn t a value in the index The following example shows how to use the binarySearch() method in your program You ll notice that this example is nearly the same as the previous example, and it uses the same array and array element values Those values are sorted by the sort() method before the binarySearch() method is called Two arguments are passed to the binarySearch() method The first ar gument is the array name, and the second argument is the search criteria The binarySearch() method returns a 2 when this program runs because 2 represents the index of the array element that contains the value Clark The index is then displayed on the screen
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import javautil*; class Demo { public static void main(String args[]) { int index; String myArray[]= new String[4]; myArray [0] = "Mary"; myArray [1] = "Adam"; myArray [2] = "Clark"; myArray [3] = "Bob"; Arrayssort(myArray); index = ArraysbinarySearch(myArray, "Clark"); Systemoutprintln("Clark is in array element: " + index); } }
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Quiz
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1 What is an index 2 What is a reference to an array 3 What does the new operator return when an array is declared 4 What is the index of the first element of an array 5 How do you pass an array to a method
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6 How do you return an array from a method
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Java Demystified
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7 How do you determine the number of array elements of an array 8 What does the third parameter of the fill() method (the second version of the method) represent 9 What does it mean when the binarySearch() method returns a negative number 10 What is a package
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CHAPTER
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Methods and Polymorphism
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The best part of calling is plumber to fix a leaky pipe is that you don t have to fix the pipe yourself You don t even need to know how to fix a pipe Instead, you simply say, This pipe has a leak Fix it A few hours later, the plumber returns telling you that the pipe is fixed and presents you with the bill The plumber is like a method in a Java program because a programmer calls a method to perform a task, and then the method tells the programmer whether the task was successfully completed Fortunately, a method doesn t present the programmer with a bill In this chapter, you learn how to call a method from within your program and how to create your own methods
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Java Demystified
An Inside Look at Methods
A method is the part of a Java program that contains the logic to perform a task Each time you need the task performed, you simply call the method The method then does its thing and comes back and tells you that the task is completed Let s say your Java program displays a course registration form on the screen whenever a student needs to register for a course You can create a method to display the course registration form and then call the method whenever you need the form displayed The method handles all the steps necessary to display the form A major reason for using methods is to drastically reduce the number of duplicated statements in a program This can be seen in the example of the course registration form Suppose that 15 statements are needed to display the course registration form Also suppose that you didn t create a method to display the form This means you ll need to write 15 statements each time you want to display the course registration form a total of 150 statements if the form is displayed ten times in your program An alternative is to place these 15 statements in a method and then call the method ten times Those 15 statements are written once in your program, saving you from having to write 135 statements Another reason for using a method is to make it easy for you to maintain the program Changes are made in one place in the method You don t have to hunt down and change statements in all the places in your program Instead, you look in one place in your program and make the change once Using a method also reduces the risk of errors Typographical errors commonly occur when you type instructions into your program By reducing the number of statements that are repeated in a program, you also reduce number of opportunities for making typographical errors
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