The following example has two arguments: one is a String and the other is an integer.
The formatted string can contain multiple arguments of different types. Let’s start by looking at a String formatted with several arguments. Strings can be formatted in very much the same way as for numbers and will use many of the same flags. Prefix for date and time conversion characters This is not an exhaustive list, for you must consult the Java documentation. To round-up the conversion characters I have talked about I have constructed a summary table. The values within square brackets are optional, the only required elements of a format string are the percentage character % and a conversion character. The format specifier for general, character, and numeric types have the following syntax: Include a sign (+ or – ) with this argument To round-up what I have talked about so far I have prepared a table summarising the flags. a lowercase x results in a lowercase X in the output number. The case of the X determines the case of the X in the output number i.e. An octal number 0144 String.format("An hex number %x", 100) String.format("An octal number %#o", 100) String.format("An octal number %o", 100) There are two formatting options for displaying Octal and Hexadecimal numbers: with a leading 0 or 0x or without any leading characters. Note that the number of spaces to the left in not 10, but the width of the number is 10 with the remaining space after the number filled with the space character to make the number characters long. String.format("A left-justified number ", 42) The number can be displayed justify to the left and with a given width. Note that the number of zeros in not 10, but the width of the number is 10 with the remaining space after the number filled with zeros to make the number 10 digit long. String.format("A padded number %010d", 42) Padding a number with zeros is done with the 0 flag and by specifying the width. Temperature of Jupiter -145 Celsius Padding a number with zeros Temperature of the Sun +5,778 K String.format("Temperature of Jupiter %,+d Celsius", -145) String.format("Temperature of the Sun %,+d K", 5778) Use the + character to include a positive or negative sign. Absolute zero is (273.15) degrees Celsius Include positive or negative sign String.format("Absolute zero is %(.2f degrees Celsius", -273.15f) Use the ( character to indicate that negative numbers should be enclosed in parenthesis.
Let’s have quick look at other number formatting options. The comma is locale-specific so the dot (.) separator would be used in regions that use that character to group numbers. To add a number separator include the comma character after the % placeholder. The Bag costs $12.99 Add Number Separator
#STRING FORMATTER JAVA EXAMPLE CODE#
To format a number to a given number of decimal places specify the number of places after the % placeholder character as shown in the following code snippet. Notice how the number is not formatted as a currency two-decimal number. In the following example, the formatted String consists of a String and a floating point primitive. More than one placeholder can be replaced at a time. The format() method returns a String containing the message Hello Alex. In the code snippet below the placeholder, %s is replaced by the name Alex. Formatting data will always start with a percent sign ( %) followed by the formatting semantics. It can contain both String literals information that isn’t associated with any arguments and argument-specific formatting data. The “format string” is used to format the values in the argument list. They both behave exactly the same way and have the same signature. The format() method is a static method of the String.class and the printf() method is a method of the static. There are two methods that provide String formatting behavior: format() and printf(). This article is as much for you as it is an aide memoir for myself. Although it is complete, it is not very user-friendly, so I thought I would try and write a clearer version. The Java Documentation of String formatting is not the easiest to read and understand if you are not familiar with String formatting or just want a quick solution.
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