What is the Java’s internal represention for String? Modified UTF-8? UTF-16?

by

Java uses UTF-16 for the internal text representation

The representation for String and StringBuilder etc in Java is UTF-16

https://docs.oracle.com/javase/8/docs/technotes/guides/intl/overview.html

How is text represented in the Java platform?

The Java programming language is based on the Unicode character set, and several libraries implement the Unicode standard. The primitive data type char in the Java programming language is an unsigned 16-bit integer that can represent a Unicode code point in the range U+0000 to U+FFFF, or the code units of UTF-16. The various types and classes in the Java platform that represent character sequences – char[], implementations of java.lang.CharSequence (such as the String class), and implementations of java.text.CharacterIterator – are UTF-16 sequences.

At the JVM level, if you are using -XX:+UseCompressedStrings (which is default for some updates of Java 6) The actual in-memory representation can be 8-bit, ISO-8859-1 but only for strings which do not need UTF-16 encoding.

http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html

and supports a non-standard modification of UTF-8 for string serialization.

Serialized Strings use UTF-8 by default.

And how many bytes does Java use for a char in memory?

A char is always two bytes, if you ignore the need for padding in an Object.

Note: a code point (which allows character > 65535) can use one or two characters, i.e. 2 or 4 bytes.

More Related Contents:

  1. Binary to text in Java
  2. Unable to print russian characters
  3. Java Encode file to Base64 string To match with other encoded string
  4. How to get UTF-8 working in Java webapps?
  5. How to convert Strings to and from UTF8 byte arrays in Java
  6. Java properties UTF-8 encoding in Eclipse
  7. “unmappable character for encoding” warning in Java
  8. Java – Convert String to valid URI object
  9. “Unmappable character for encoding UTF-8” error
  10. Guessing the encoding of text represented as byte[] in Java
  11. IntelliJ IDEA incorrect encoding in console output
  12. File was loaded in the wrong encoding:’UTF-8′ in IntelliJ IDEA
  13. Difference between UTF-8 and UTF-16?
  14. Java BufferedWriter object with utf-8
  15. Java 8 UTF-8 encoding issue (java bug?)
  16. How can I safely encode a string in Java to use as a filename?
  17. Check if a String is valid UTF-8 encoded in Java
  18. How does Java store UTF-16 characters in its 16-bit char type?
  19. cyrillic in windows Console(java) System.out.println();
  20. Byte and char conversion in Java
  21. How to replace � in a string
  22. HttpServletRequest UTF-8 Encoding [duplicate]
  23. Should source code be saved in UTF-8 format
  24. Why is Java BufferedReader() not reading Arabic and Chinese characters correctly?
  25. How to determine if a String contains invalid encoded characters
  26. Producing valid XML with Java and UTF-8 encoding
  27. Why does byteArray have a length of 22 instead of 20?
  28. Java ByteBuffer to String
  29. Remove a specific string from an array of string
  30. Why StringJoiner when we already have StringBuilder?

Leave a Comment