Integral Types and Values

Type

The values of the integral types of the Java Virtual Machine are:

For byte, from -128 to 127 (-2^7 to 2^7 - 1), inclusiveFor short, from -32768 to 32767 (-2^15 to 2^15 - 1), inclusiveFor int, from -2147483648 to 2147483647 (-2^31 to 2^31 - 1), inclusiveFor long, from -9223372036854775808 to 9223372036854775807 (-2^63 to 2^63 - 1), inclusiveFor char, from 0 to 65535 inclusive

FQA

1. 1000 0000 1 是符号位
2. char为UTF-8编码。2^16，此时没有符号位