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## corejava
Class Format

    java.lang.Object
      corejava.Format

public class Format
extends Object

A class for formatting numbers that follows `printf` conventions. Also implements C-like `atoi` and `atof` functions

Version:
  1.22 2002-11-16

Constructor Summary
`Format(String s)` Formats the number following `printf` conventions.

Method Summary
`static double` | `atof(String s)` Converts a string of digits to a `double`
`static int` | `atoi(String s)` Converts a string of digits (decimal, octal or hex) to an integer
`static long` | `atol(String s)` Converts a string of digits (decimal, octal or hex) to a long integer
`String` | `format(char c)` Formats a character into a string (like sprintf in C)
`String` | `format(double x)` Formats a `double` into a string (like sprintf in C)
`String` | `format(int x)` Formats an integer into a string (like sprintf in C)
`String` | `format(long x)` Formats a long integer into a string (like sprintf in C)
`String` | `format(String s)` Formats a string into a larger string (like sprintf in C)
`static void` | `main(String[] a)` a test stub for the format class
`static void` | `printf(String fmt, char x)` prints a formatted number following printf conventions
`static void` | `printf(String fmt, double x)` prints a formatted number following printf conventions
`static void` | `printf(String fmt, int x)` prints a formatted number following printf conventions
`static void` | `printf(String fmt, long x)` prints a formatted number following printf conventions
`static void` | `printf(String fmt, String x)` prints a formatted number following printf conventions

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Format

    public Format(String s)

  Formats the number following `printf` conventions. Main limitation: Can only handle one format parameter at a time Use multiple Format objects to format more than one number

Parameters:
  `s` - the format string following printf conventions The string has a prefix, a format code and a suffix. The prefix and suffix become part of the formatted output. The format code directs the formatting of the (single) parameter to be formatted. The code has the following structure
  - a % (required)
  - a modifier (optional)
    +
      forces display of + for positive numbers
    0
      show leading zeroes
    -
      align left in the field
    space
      prepend a space in front of positive numbers
    #
      use "alternate" format. Add 0 or 0x for octal or hexadecimal numbers. Don't suppress trailing zeroes in general floating point format.
  - an integer denoting field width (optional)
  - a period followed by an integer denoting precision (optional)
  - a format descriptor (required)
    f
      floating point number in fixed format
    e, E
      floating point number in exponential notation (scientific format). The E format results in an uppercase E for the exponent (1.14130E+003), the e format in a lowercase e.
    g, G
      floating point number in general format (fixed format for small numbers, exponential format for large numbers). Trailing zeroes are suppressed. The G format results in an uppercase E for the exponent (if any), the g format in a lowercase e.
    d, i
      integer in decimal
    x
      integer in hexadecimal
    o
      integer in octal
    s
      string
    c
      character
Throws:
  `IllegalArgumentException` - if bad format

Method Detail

### printf

    public static void printf(String fmt,
                              double x)

  prints a formatted number following printf conventions

  Parameters:
    `fmt` - the format string
    `x` - the double to print

### printf

    public static void printf(String fmt,
                              int x)

  prints a formatted number following printf conventions

  Parameters:
    `fmt` - the format string
    `x` - the int to print

### printf

    public static void printf(String fmt,
                              long x)

  prints a formatted number following printf conventions

  Parameters:
    `fmt` - the format string
    `x` - the long to print

### printf

    public static void printf(String fmt,
                              char x)

  prints a formatted number following printf conventions

  Parameters:
    `fmt` - the format string
    `x` - the character to print

### printf

    public static void printf(String fmt,
                              String x)

  prints a formatted number following printf conventions

  Parameters:
    `fmt` - the format string
    `x` - a string to print

### atoi

    public static int atoi(String s)

  Converts a string of digits (decimal, octal or hex) to an integer

  Parameters:
    `s` - a string
  Returns:
    the numeric value of the prefix of s representing a base 10 integer

### atol

    public static long atol(String s)

  Converts a string of digits (decimal, octal or hex) to a long integer

  Parameters:
    `s` - a string
  Returns:
    the numeric value of the prefix of s representing a base 10 integer

### atof

    public static double atof(String s)

  Converts a string of digits to a `double`

  Parameters:
    `s` - a string

### format

    public String format(double x)

  Formats a `double` into a string (like sprintf in C)

  Parameters:
    `x` - the number to format
  Returns:
    the formatted string
  Throws:
    `IllegalArgumentException` - if bad argument

### format

    public String format(int x)

  Formats an integer into a string (like sprintf in C)

  Parameters:
    `x` - the number to format
  Returns:
    the formatted string

### format

    public String format(long x)

  Formats a long integer into a string (like sprintf in C)

  Parameters:
    `x` - the number to format
  Returns:
    the formatted string

### format

    public String format(char c)

  Formats a character into a string (like sprintf in C)

  Returns:
    the formatted string

### format

    public String format(String s)

  Formats a string into a larger string (like sprintf in C)

  Returns:
    the formatted string

### main

    public static void main(String[] a)

  a test stub for the format class

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