Data Types in Java

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Any character except
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align < left > right ^ center = pad
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between sign and digits for numbers
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sign + force sign; - sign if needed; space or - as appropriate
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pre x ints with 0b, 0o, or 0x
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0-pad numbers
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width
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Minimum eld width
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, precision type
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Maximum eld width for strings; number of decimal places for oatingpoint numbers ints b, c, d, n, o, x, X; floats e, E, f, g, G, n, use commas for grouping
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Figure 26 The general form of a format speci cation
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>>> "{0:25}"format(s) # minimum width 25 'The sword of truth ' >>> "{0:>25}"format(s) # right align, minimum width 25 ' The sword of truth' >>> "{0:^25}"format(s) # center align, minimum width 25 ' The sword of truth ' >>> "{0:-^25}"format(s) # - fill, center align, minimum width 25 '---The sword of truth----' >>> "{0:<25}"format(s) # fill, left align, minimum width 25 'The sword of truth' >>> "{0:10}"format(s) # maximum width 10 'The sword '
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In the penultimate example we had to specify the left alignment (even though this is the default) If we left out the <, we would have :25, and this simply means a maximum eld width of 25 characters As we noted earlier, it is possible to have replacement elds inside format speci cations This makes it possible to have computed formats Here, for example, are two ways of setting a string s maximum width using a maxwidth variable:
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>>> maxwidth = 12 >>> "{0}"format(s[:maxwidth]) 'The sword of' >>> "{0:{1}}"format(s, maxwidth) 'The sword of'
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The rst approach uses standard string slicing; the second uses an inner replacement eld
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The grouping comma was introduced with Python 31
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Strings
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For integers, the format speci cation allows us to control the ll character, the alignment within the eld, the sign, whether to use a nonlocale-aware comma separator to group digits (from Python 31), the minimum eld width, and the number base An integer format speci cation begins with a colon, after which we can have an optional pair of characters a ll character (which may not be }) and an alignment character (< for left align, ^ for center, > for right align, and = for the lling to be done between the sign and the number) Next is an optional sign character: + forces the output of the sign, - outputs the sign only for negative numbers, and a space outputs a space for positive numbers and a - sign for negative numbers Then comes an optional minimum width integer this can be preceded by a # character to get the base pre x output (for binary, octal, and hexadecimal numbers), and by a 0 to get 0-padding Then, from Python 31, comes an optional comma if present this will cause the number s digits to be grouped into threes with a comma separating each group If we want the output in a base other than decimal we must add a type character b for binary, o for octal, x for lowercase hexadecimal, and X for uppercase hexadecimal, although for completeness, d for decimal integer is also allowed There are two other type characters: c, which means that the Unicode character corresponding to the integer should be output, and n, which outputs numbers in a localesensitive way (Note that if n is used, using , doesn t make sense) We can get 0-padding in two different ways:
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>>> "{0:0=12}"format(8749203) '000008749203' >>> "{0:0=12}"format(-8749203) '-00008749203' >>> "{0:012}"format(8749203) '000008749203' >>> "{0:012}"format(-8749203) '-00008749203' # 0 fill, minimum width 12 # 0 fill, minimum width 12 # 0-pad and minimum width 12 # 0-pad and minimum width 12
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The rst two examples have a ll character of 0 and ll between the sign and the number itself (=) The second two examples have a minimum width of 12 and 0-padding Here are some alignment examples:
>>> "{0:*<15}"format(18340427) '18340427*******' >>> "{0:*>15}"format(18340427) '*******18340427' >>> "{0:*^15}"format(18340427) '***18340427****' >>> "{0:*^15}"format(-18340427) '***-18340427***' # * fill, left align, min width 15 # * fill, right align, min width 15 # * fill, center align, min width 15 # * fill, center align, min width 15