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the `decimalformat` class in java is part of the `java.text` package and is used for formatting decimal numbers. it allows you to format numbers into a string representation with specific patterns, which can include grouping separators, decimal points, and various other formatting options.

key features of decimalformat:

1. **custom patterns**: you can specify a pattern for formatting numbers, such as the number of decimal places, the grouping of thousands, etc.
2. **localization**: you can format numbers according to different locale settings.
3. **rounding**: it provides options for rounding numbers when formatting.

basic pattern syntax

the patterns used in `decimalformat` consist of:
`0`: digit, shows a zero if absent.
``: digit, shows nothing if absent.
`.`: decimal point.
`,`: grouping separator.

example usage

here's a comprehensive tutorial with an example demonstrating how to use `decimalformat` in java.

step 1: import the package

you need to import the `java.text.decimalformat` class before using it.



step 2: create a decimalformat instance

you can create an instance of `decimalformat` using a pattern.



step 3: formatting numbers

you can format numbers using the `format()` method.

example code

here's a complete example that demonstrates various features of `decimalformat`.



explanation of the example

1. **basic formatting**: the `` symbol indicates that a digit will be displayed if it exists, and `,` is used for grouping thousands. the `.` is used for the decimal point.

2. **formatting for different locales**: by creating a `decimalformatsymbols` instance with a specific locale (in this case, germany), you can format numbers according to the conventions of that locale (e.g., using `.` as the decimal separator and `,` for thousands).

3. **rounding**: the pattern `"."` rounds the number to two decimal places.

4. **currency formatting**: the pattern `"$,0.00"` formats the number as a currency with a dollar sign.

conclusion ...

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