Class stdio

java.lang.Object
  |
  +--stdio

public class stdio

extends java.lang.Object

stdio defines static methods for using typed input from the console window. This class includes two methods for getting a line of input, two methods for handling (i.e. parsing) typed-in numbers, and a simple rounding method so that System.out.println won't print "0.33333333333333333" when you want to see "0.33".

Known uses: I have used this class successfully as a way to let my students produce command-line applications that they can run in a MS-DOS command line window. This lets them get started without first having to climb the learning curve for Java GUI programming (AWT and Swing).

Hints for use: Put stdio.java and stdio.class into your project folder and then use stdio in your project as you would use any other class.

Version 1.0

Constructor Summary

stdio()

Method Summary

static java.lang.String	getLine() returns line of typed input as a String.
static java.lang.String[]	getLineTokens() returns line of typed input as an array of Strings.
static java.lang.Double	parseDouble(java.lang.String s) attempts to parse input string into a Double.
static java.lang.Integer	parseInteger(java.lang.String s) attempts to parse input string into an Integer.
static double	round2(double x) rounds a double to 2 or fewer digits to the right of the decimal point

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

stdio

public stdio()

Method Detail

getLine

public static java.lang.String getLine()

returns line of typed input as a String. If the line is empty, returns a zero-length string.

getLineTokens

public static java.lang.String[] getLineTokens()

returns line of typed input as an array of Strings. Each String in the array contains one word of the input. If the line is empty, returns null.

parseDouble

public static java.lang.Double parseDouble(java.lang.String s)

attempts to parse input string into a Double. Returns null if it can't.

parseInteger

public static java.lang.Integer parseInteger(java.lang.String s)

attempts to parse input string into an Integer. Returns null if it can't.

round2

public static double round2(double x)

rounds a double to 2 or fewer digits to the right of the decimal point