jutil
Class IOUtils

java.lang.Object
  jutil.IOUtils

public class IOUtils
extends java.lang.Object

Utilities for console and file I/O.

Field Summary

static java.io.PrintWriter	stderr Represents standard error stream; default destination is console window unless redirected at the command line.
static java.io.BufferedReader	stdin Represents standard input stream; default source is keyboard unless redirected at the command line.
static java.io.PrintWriter	stdout Represents standard output stream; default destination is console window unless redirected at the command line.

Constructor Summary

IOUtils()

Method Summary

static void	error(java.lang.String gripe) Prints an error message to stderr.
static java.io.BufferedReader	makeReader(java.lang.String fname) A factory for turning file names into character input streams.
static java.io.PrintWriter	makeWriter(java.lang.String fname) A factory for turning file names into character output streams.
static void	print(java.io.PrintWriter writer, java.lang.String msg) Prints a message to a character output stream without a newline.
static void	print(java.lang.String msg) Prints a message to stdout without a newline.
static void	println(java.io.PrintWriter writer, java.lang.String msg) Prints a message to a character output stream with a newline.
static void	println(java.lang.String msg) Prints a message to stdout with a newline.
static java.lang.String	readLine() Reads a line from stdin without throwing an exception.
static java.lang.String	readLine(java.io.BufferedReader reader) Reads a line from a reader without throwing an exception.
static void	seriousError(java.lang.String gripe) Prints an error message to stdout then terminates the application.
static java.util.StringTokenizer	tokenize(java.lang.String tokens) Parses a string into a sequence of tokens.

Methods inherited from class java.lang.Object

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

Field Detail

stdin

public static final java.io.BufferedReader stdin

Represents standard input stream; default source is keyboard unless redirected at the command line.

stdout

public static final java.io.PrintWriter stdout

Represents standard output stream; default destination is console window unless redirected at the command line.

stderr

public static final java.io.PrintWriter stderr

Represents standard error stream; default destination is console window unless redirected at the command line.

Constructor Detail

IOUtils

public IOUtils()

Method Detail

makeWriter

public static java.io.PrintWriter makeWriter(java.lang.String fname)

A factory for turning file names into character output streams.

Parameters:

fname - the name of the file to be written

Returns:

a character output stream

makeReader

public static java.io.BufferedReader makeReader(java.lang.String fname)

A factory for turning file names into character input streams.

Parameters:

fname - The name of the text file to be read.

Returns:

a character input stream

readLine

public static java.lang.String readLine(java.io.BufferedReader reader)

Reads a line from a reader without throwing an exception. A line is terminated by a newline char.

Parameters:

reader - a character input stream

Returns:

next line from the reader

readLine

public static java.lang.String readLine()

Reads a line from stdin without throwing an exception.

Returns:

next line from stdout

print

public static void print(java.io.PrintWriter writer,
                         java.lang.String msg)

Prints a message to a character output stream without a newline.

Parameters:

writer - a file output stream

msg - the message displayed

println

public static void println(java.io.PrintWriter writer,
                           java.lang.String msg)

Prints a message to a character output stream with a newline.

Parameters:

writer - a file output stream

msg - the message displayed

print

public static void print(java.lang.String msg)

Prints a message to stdout without a newline.

Parameters:

msg - the message displayed

println

public static void println(java.lang.String msg)

Prints a message to stdout with a newline.

Parameters:

msg - the message displayed

tokenize

public static java.util.StringTokenizer tokenize(java.lang.String tokens)

Parses a string into a sequence of tokens. A token is a string containing no white space.

Parameters:

tokens - the string to be parsed

Returns:

a sequence of tokens.

error

public static void error(java.lang.String gripe)

Prints an error message to stderr.

Parameters:

gripe - the error message

seriousError

public static void seriousError(java.lang.String gripe)

Prints an error message to stdout then terminates the application.

Parameters:

gripe - the error message