princeton.introcs

Class StdIn

java.lang.Object

princeton.introcs.StdIn

public final class StdIn
extends Object

Standard input. This class provides methods for reading strings and numbers from standard input.

The Locale used is: language = English, country = US. This is consistent with the formatting conventions with Java floating-point literals, command-line arguments (via Double.parseDouble()) and standard output (via System.out.print()). It ensures that standard input works with the input files used in the textbook.

For additional documentation, see Section 1.5 of Introduction to Programming in Java: An Interdisciplinary Approach by Robert Sedgewick and Kevin Wayne.

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	hasNextLine() Does standard input have a next line?
static boolean	isEmpty() Is there only whitespace left on standard input?
static void	main(String[] args) Unit test
static String	readAll() Return rest of input from standard input
static boolean	readBoolean() Return next boolean from standard input, allowing "true" or "1" for true, and "false" or "0" for false
static byte	readByte() Return next byte from standard input
static char	readChar() Return next char from standard input
static double	readDouble() Return next double from standard input
static double[]	readDoubles() Read rest of input as array of doubles
static float	readFloat() Return next float from standard input
static int	readInt() Return next int from standard input
static int[]	readInts() Read rest of input as array of ints
static String	readLine() Return rest of line from standard input
static long	readLong() Return next long from standard input
static short	readShort() Return next short from standard input
static String	readString() Return next string from standard input
static String[]	readStrings() Read rest of input as array of strings

Methods inherited from class java.lang.Object

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

Method Detail

isEmpty

public static boolean isEmpty()

Is there only whitespace left on standard input?

readString

public static String readString()

Return next string from standard input

readInt

public static int readInt()

Return next int from standard input

readDouble

public static double readDouble()

Return next double from standard input

readFloat

public static float readFloat()

Return next float from standard input

readShort

public static short readShort()

Return next short from standard input

readLong

public static long readLong()

Return next long from standard input

readByte

public static byte readByte()

Return next byte from standard input

readBoolean

public static boolean readBoolean()

Return next boolean from standard input, allowing "true" or "1" for true, and "false" or "0" for false

hasNextLine

public static boolean hasNextLine()

Does standard input have a next line?

readLine

public static String readLine()

Return rest of line from standard input

readChar

public static char readChar()

Return next char from standard input

readAll

public static String readAll()

Return rest of input from standard input

readInts

public static int[] readInts()

Read rest of input as array of ints

readDoubles

public static double[] readDoubles()

Read rest of input as array of doubles

readStrings

public static String[] readStrings()

Read rest of input as array of strings

main

public static void main(String[] args)

Unit test