Char parsing and type variable size in Java

In Java, Unicode encoding is used by default, so char occupies two bytes .. C ++ occupies 1 byte ..

 

The size of bytes occupied by type variables is determined by the language standard and the compiling environment. If the size is defined in the language standard, it is determined by the standard, otherwise, it is determined by the compiling environment ..

For example, in VC, int occupies 4 bytes, while in TC, int occupies 2 bytes .. This is not clearly defined in language standards. Therefore, it is determined by the compiling environment .. The long type is clearly defined in the standard.