Unicode support for Java

Java char data types based on UTF-16 format. The Unicode standard has changed latter to more than 16 bits. Currently the range of legal code points is now U+0000 to U+10FFFF.

Basic Multilingual Plane

The set of characters from U+0000 to U+FFFF is sometimes referred to as the Basic Multilingual Plane.

supplementary characters

Characters whose code points are greater than U+FFFF are called supplementary characters.

Java platform represents uni code characters in UTF-16 format. Supplementary characters are represented as a pair of char values, the first from the high-surrogates range, (\uD800-\uDBFF), the second from the low-surrogates range (\uDC00-\uDFFF).

Note:

1. The methods that only accept a char value cannot support supplementary characters.
2. The methods that accept an int value support all Unicode characters, including supplementary characters.

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