Take a copy of the above program, rename the class and...

Name: Problem 2, Chapter 4: An Introduction to Network Programming with Java
Uploaded: 2022-02-07T07:38:40-08:00
Duration: 5 min 47 s
Channel: Harriet O'Brien
Description: Take a copy of the above program, rename the class and modify the appropriate line so that the program accepts input from the standard input stream (i.e., using a Scanner around the standard input stream, System.in). Then use redirection to feed the values from your payroll text file into your program (displaying the contents as before).

Take a copy of the above program, rename the class and modify the appropriate line so that the program accepts input from the standard input stream (i.e., using a Scanner around the standard input stream, System.in). Then use redirection to feed the values from your payroll text file into your program (displaying the contents as before).

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Key Concepts

Standard Input Stream

The standard input stream (System.in in Java) is a pre-connected input source provided by the operating system for reading byte data. It is generally used when an application needs to read information from the keyboard or other input sources. By wrapping System.in with classes like Scanner, developers can easily parse and process user inputs or redirected file inputs.

Scanner Class

The Scanner class in Java is a utility that simplifies parsing primitive types and strings using regular expressions. It is often used to read input from various streams including System.in. Instead of manually handling input characters, Scanner provides methods like next(), nextInt(), nextLine(), which facilitate easy conversion and extraction of tokens from the input stream.

Input Redirection

Input redirection is a technique used during program execution that directs the contents of a file to the standard input stream (System.in) of a program. This allows a file to serve as the input source instead of directly typing values into the console. Redirection is typically implemented at the command line, using syntax like 'java Program < inputfile', which makes testing and processing of bulk data more efficient.

Transcript

00:01 In this video, we will program a financial application that takes an employee's name.

00:05 A number of hours worked in a week, hourly pay rate, federal tax withholding rate, and state tax withholding rate, and prints a payroll statement for this person.

00:16 I've already outlined the class as well as the main method within it.

00:19 I've also already imported java .utile .scanner since we'll be taking user input.

00:24 First thing we can go ahead and do is go into the main method and create a new scanner object.

00:31 We can pass in system .n, the predefined object, which is the standard input stream.

00:40 Next, we'll want to use system .out .println to prompt the user to enter employee's name.

01:07 Next, we'll save that as name, the string value input, next line.

01:21 Next, we'll want to prompt the user to tell us the number of hours worked in a week.

01:28 After this, we can store this as a double.

01:32 Hours equals input.

01:34 Next, we will want to prompt the user to enter our hourly pay rate.

01:47 We can save this as a double called rate as well.

01:52 Input, next double.

01:58 We'll also want to prompt our user to enter the effect.

02:02 Federal tax withholding rate.

02:07 Again, we'll save this as a double...

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