The snippet library.

JavaNumbers & dates

Add days to a date ↗

Parse an ISO date and add calendar days using Java LocalDate.

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JavaFiles & paths

Append a line ↗

Append text to a Java file, creating it if necessary.

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JavaText validation & formatting

Build text efficiently in a loop ↗

Java: Append to StringBuilder when constructing a string incrementally.

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JavaEncoding & structured values

Calculate a SHA-256 content digest ↗

Java: Hash UTF-8 bytes and format the result as lowercase hexadecimal.

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JavaGetting Started

Calculate a simple total ↗

Java: Multiply a unit price by a quantity, then add a delivery fee.

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JavaPrecise numeric calculations

Calculate beyond the long integer range ↗

Java: Use BigInteger when a fixed-width primitive type would overflow.

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JavaStream transformations

Calculate several numeric stream statistics ↗

Java: Use summaryStatistics to calculate count, sum, minimum, maximum, and average in one pass.

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JavaGetting Started

Call a library function ↗

Java: Use a standard absolute-value function with a small negative number.

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JavaText validation & formatting

Check a filename suffix ↗

Java: Use endsWith for a case-sensitive literal suffix test.

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JavaText validation & formatting

Check a string prefix ↗

Java: Use startsWith to check a literal Java prefix without a regular expression.

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JavaStream transformations

Check any and all stream elements ↗

Java: Use short-circuiting match operations for predicates over a Java collection.

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JavaDates & time zones

Check the Gregorian leap-year rule ↗

Java: Use Year.isLeap rather than checking divisibility by four alone.

Java✓ Tested