ing execution. That way, new results can be computed each time the Class The Scanner
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1 ing execution. That way, new results can be computed each time the run, depending on the data that is entered. The Scanner Class The Scanner class, which is part of the standard Java class provides convenient methods for reading input values of types. The input could come from various sources, : typed interactively by the user or data stored in a file'. The
2 2.6 INTERACTIVE PROGRAMS --_J to parse a character string into separate pieces. Figure 2.7 methods provi,ded by the Scanner class. ~ a Scanner object in order to invoke its methods. Objects.._~ using the new operator. The following declaration creates a that reads input from the keyboard: scan = new Scanner (System. in); creates a variable called scan that represents a Scanner object itself is created by the new operator and a call to a special a constructor to set up the object. The Scanner constructor indicates the source of the input. The System. in object input stream, which by default is the keyboard. Creating new operator is discussed further in the next chapter. J otherwise, a Scanner object assumes that white space charac-.; characters, tabs, and new lines) are used to separate the eleme~ts of called tokens, from each other. These characters are called the input. The set of delimiters can be changed if the input tokens are separated.~--- other than white space. method of the Scanner class reads the next input token as a string it. Therefore, if the input consisted of a series of words separated by call to next would return the next word. The next-line method : ; end of the line is found, and returns it as one string. - -~ Echo, shown in Listing 2.8, simply reads a line of text typed by stores it in a variable that holds a character string, then echoes it back B ~7"~.J statement above the definition of the Echo class tells the program - program. The Scanner class is part "1 ava. util class library. The use of the import statement is discussed fur-, Chapter 3. Scanner methods such as nextint and nextdouble are provided to data of particular types. The GasMileage program, shown in Listing 2.9, miles traveled as an integer, and the number of gallons of fuel a double, then computes the gas mileage. you can see by the output of the GasMileage program, the calculation pro- a floating point result that is accurate to several decimal places. In the next ~~~pter we discuss classes that help us format our output in various ways, includ- Ing rounding a floating point value to a particular number of decimal places.
3 Scanner (InputStream source) Scanner (File source) Scanner (String source) Constructors: sets up the new scanner to scan values from the specified source. String next() Returns the next input token as a character string. String nextline() Returns all input remaining on the current line as a character string. boolean nextboolean() byte nextbyte() double nextdouble() float nextfloat() int nextint() long nextlong() short nextshort() Returns the next input token as the indicated type. Throws InputMismatchException if the next token is inconsistent with the type boolean hasnext() Rerurns true if the scanner has another token in its indur. Scanner usedelimiter (String pattern) Scanner usedelimiter (Pattern pattern) Sets the scanner's delimiting pattern. Pattern delimiter() Returns the pattern the scanner is currently using to match delimiters. String findinline (String pattern) String findinline (Pattern pattern).; Attempts to find the next occurrence of the specified pattern, ignoring delimiters.d ~1r:IIR~ '7 Some methods of the Scanner class
4 2.6 INTERACTIVE PROGRAMS 91.java,******************************************************* Author: Lewis/Loftus ---~ the use of the nextline method of the Scanner class a string from the user.,***************************************************** java.util.scanner; 'class )- i Echo :...Reads a character string from the user and prints it. ; static void main (String[] args) ~ message; : scan = new Scanner (System.in);.out.println ("Enter a line of text:"); message = scan.nextline()i System.out.println ("You entered: \"" + message + "\""); ".'- -, " a line of text: laser printer on stun! "Set your laser printer on stun!" object processes the input one token at a time, based on the methto read the data and the. delimiters used to separate the input values. ";;,,--> multiple values can be put on the sap1e line of input or can be sepacover multiple lines, as appropriate for the situation. : we use the Scanner class to read input from a data file and moddelimiters it uses to parse the data. Appendix H explores how to use the.. class to analyze its input using patterns called regular expressions.
5 Listing ******************************************************************** II GasMileage.java Author: LewislLoftus II II Demonstrates the use of the Scanner class to read numeric data. 11******************************************************************** import java.util.scanner; public class GasMileage II Calculates fuel efficiency '~ based on values entered by the II user. public II static void main (String[] ~ args) '. { int miles; double gallons, mpg; Scanner scan = new Scanner (System.in); System.aut.print ("Enter the number af miles: ")i miles = scan.nextint()i System.out.print ("Enter the gallons of fuel used: ")j gallons = scan.nextdouble()j mpg = miles / gallons; System. out. println ("Miles Per Gallon: " + mpg); } } Output Enter the number of miles: 328 Enter the gallons of fuel used: 11.2 Miles Per Gallon:
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