The snippet library.

JavaNumbers & dates

Parse an integer safely ↗

Handle invalid Java integer input with NumberFormatException.

Java✓ Tested

JavaStream transformations

Partition a collection by a predicate ↗

Java: Use partitioningBy to retain both matching and nonmatching values.

Java✓ Tested

JavaQueues & collection operations

Preserve map insertion order ↗

Java: Use LinkedHashMap when iteration should follow the order keys were first added.

Java✓ Tested

JavaGetting Started

Print a number with two decimal places ↗

Java: Format a small decimal value consistently for display.

Java✓ Tested

JavaFile operations & binary data

Process a text file one line at a time ↗

Java: Use a buffered reader to avoid loading a large file into memory.

Java✓ Tested

JavaText validation & formatting

Process the lines of an in-memory string ↗

Java: Use String.lines to handle common line terminators without retaining them.

Java✓ Tested

JavaEncoding & structured values

Read a big-endian integer from bytes ↗

Java: Set a byte order explicitly when handling a binary protocol.

Java✓ Tested

JavaFile operations & binary data

Read a file length in bytes ↗

Java: Files.size inspects metadata without loading the file into a Java string.

Java✓ Tested

JavaCollections

Read a map with a default ↗

Return a fallback when a Java map does not contain a key.

Java✓ Tested

JavaFiles & paths

Read a UTF-8 file ↗

Read a small UTF-8 file into a Java string.

Java✓ Tested

JavaDates & time zones

Read an ISO week year and week number ↗

Java: Use ISO week fields together because a week can belong to the previous calendar year.

Java✓ Tested

JavaGetting Started

Read one character from ASCII text ↗

Java: Use a valid zero-based index to read the first character.

Java✓ Tested