What is the difference between Compact Strings and Compressed Strings in Java 9?

Compressed StringsIntroduced in Java 9 to replace Java 6’s Compressionstring. Its implementation uses byte[] arrays instead of char[] arrays, and introduces a new field encoder to identify whether it is LATIN1 or >UTF16 format, while Compression String has been introduced in Java 6, it is possible to use bytes[]each A one-byte array of characters, and continues with a char[] array of two bytes per character, which could previously be opened with -XX: UseCompressedStrings. p>

Unlike compressed strings, compressed strings do not require unpacking or repacking. Therefore, compact strings provide better performance at runtime.

CompressionString is not enabled by default in Java 6 > and needs to be set explicitly using the following command

<strong>XX:+UseCompressedStrings</strong>

Compact Strings Enabled by default in Java 9, use the following command

<strong>+XX:-CompactStrings</strong>

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