The snippet library.

JavaQueues & collection operations

Retrieve the smallest queued value first ↗

Java: PriorityQueue poll removes the smallest value under the natural ordering.

Java✓ Tested

JavaRecords & reliable control flow

Return a value from a switch expression ↗

Java: Use an exhaustive switch expression with a fallback for other input values.

Java✓ Tested

JavaPrecise numeric calculations

Round a decimal with an explicit rule ↗

Java: Construct BigDecimal from text to avoid importing a binary floating-point approximation.

Java✓ Tested

JavaRecords & reliable control flow

Run a task on an executor and close it ↗

Java: Java 21 ExecutorService supports try-with-resources to shut down after submitted work.

Java✓ Tested

JavaRecords & reliable control flow

Run cleanup after a handled exception ↗

Java: A finally block executes whether the protected operation succeeds or fails.

Java✓ Tested

JavaGetting Started

Run your first program ↗

Java: Start with a complete program that prints one line. Follow the run instructions below.

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JavaCollections

Sort a list ↗

Sort a mutable Java list in natural ascending order.

Java✓ Tested

JavaStrings

Split comma-separated text ↗

Split a simple comma-separated string into individual Java values.

Java✓ Tested

JavaGetting Started

Store a value in a named variable ↗

Java: Give a value a descriptive name and print it.

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JavaNumbers & dates

Sum integer values ↗

Reduce a Java integer stream to its sum.

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JavaStream transformations

Take a page from a stream ↗

Java: Use skip and limit with a known stable input order.

Java✓ Tested

JavaQueues & collection operations

Take an immutable list snapshot ↗

Java: List.copyOf protects the snapshot from later changes to the source list.

Java✓ Tested