1.2 and Reserved Words 绪Keyword 论The following keywords are primitives: byte An 8-bit integer (signed).
double A 64-bit floating-point number (signed). float A 32-bit floating-point number (signed). int A 32-bit integer (signed).
long A 64-bit integer (signed). short A 16-bit integer (signed). char A single Unicode character (16-bit unsigned) (Unicode字符， 16位无符号) boolean A value indicating true or false.
Java Programming, spring, 2012