由于java语言规则或jvm，添加字节转换为int?

A compiler encodes loads of literal values of types byte and short using Java Virtual Machine instructions that sign-extend those values to values of type int at compile-time or run-time. Loads of literal values of types boolean and char are encoded using instructions that zero-extend the literal to a value of type int at compile-time or run-time. [..]. Thus, most operations on values of actual types boolean, byte, char, and short are correctly performed by instructions operating on values of computational type int.

该部分也说明了这背后的原因:

The reason behind this is also specified in that section:

由于Java虚拟机的一个字节的操作码大小，编码类型为操作码的地方在它的指令集的设计压力.如果每个输入指令支持的所有Java虚拟机的运行时间数据类型的，会有更多的指令比可以在<代码>字节来表示.[...] 可以根据需要使用单独的指令在不受支持和支持的数据类型之间进行转换.

Given the Java Virtual Machine's one-byte opcode size, encoding types into opcodes places pressure on the design of its instruction set. If each typed instruction supported all of the Java Virtual Machine's run-time data types, there would be more instructions than could be represented in a byte. [...] Separate instructions can be used to convert between unsupported and supported data types as necessary.

有关所有指令集可用于各种类型的详细信息，您可以浏览该部分中的表格.

For the details on what all instruction sets are available for various types, you can go through the table in that section.

还有一个表指定实际类型到JVM计算类型的映射:

There is also a table specifying the mapping of actual type to the JVM computational type:

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