Java type upgrade Convention

General Linux technology-Linux programming and kernel information. For details, see below. Type escalation Convention
In addition to raising byt and short types to int type, java defines several types of promotion rules for expressions (type promotion rules ). first, as described earlier, the values of all byte and short types are upgraded to int. secondly, if an operand is of the long type, the entire expression will be promoted to the long type; if an operand is of the float type, the entire expression will be promoted to the float type; if one of the operands is double, the calculation result is double.

The following program shows how each value in an expression is promoted to match the second parameter of their binary operators:

QUOTE: