java - Java int 总是 32 位吗？

Question

Java 的 int 是否始终是 32 位有符号整数？

Answer 1

是的，它在 The Java Language Specification 中定义.

来自 Section 4.2: Primitive Types and Values :

The integral types are byte, short, int, and long, whose values are 8-bit, 16-bit, 32-bit and 64-bit signed two's-complement integers, respectively, and char, whose values are 16-bit unsigned integers representing UTF-16 code units (§3.1).

另外来自 Section 4.2.1: Integral Types and Values :

The values of the integral types are integers in the following ranges:

• For byte, from -128 to 127, inclusive
• For short, from -32768 to 32767, inclusive
• For int, from -2147483648 to 2147483647, inclusive
• For long, from -9223372036854775808 to 9223372036854775807, inclusive
• For char, from '\u0000' to '\uffff' inclusive, that is, from 0 to 65535