The snippet library.

JavaGetting Started

Find what remains after division ↗

Java: Use the remainder operator to count items left after forming complete groups.

Java✓ Tested

JavaStream transformations

Flatten nested collections ↗

Java: Use flatMap to concatenate nested Java lists into one stream.

Java✓ Tested

JavaNumbers & dates

Format a decimal number ↗

Format a Java decimal with two digits and a fixed locale.

Java✓ Tested

JavaDates & time zones

Generate a half-open range of dates ↗

Java: datesUntil includes the starting date and excludes the end date.

Java✓ Tested

JavaStream transformations

Group strings by their length ↗

Java: Choose a TreeMap supplier when group keys must have deterministic order.

Java✓ Tested

JavaGetting Started

Handle three possible outcomes ↗

Java: Check high, normal and low values with an ordered conditional chain.

Java✓ Tested

JavaStream transformations

Index records by a unique key ↗

Java: Use toMap with an explicit merge rule so duplicate keys have defined behavior.

Java✓ Tested

JavaQueues & collection operations

Initialize a map entry only when absent ↗

Java: Use computeIfAbsent when creating a collection for a new key.

Java✓ Tested

JavaEncoding & structured values

Inspect components of a URI ↗

Java: Use URI parsing instead of splitting a URL at punctuation manually.

Java✓ Tested

JavaStrings

Join strings with a separator ↗

Build a Java string from several values using String.join.

Java✓ Tested

JavaStream transformations

Join transformed stream values ↗

Java: Use Collectors.joining after converting elements to strings.

Java✓ Tested

JavaFiles & paths

List regular files ↗

List immediate regular files in sorted order and close the Java directory stream.

Java✓ Tested