Java automatic type conversion and coercion type conversion

1. Small data types can be automatically converted into large-capacity data types (Note: Capacity Osashi is a large range of data type representations. )
2. Automatic data type conversion:
Cast: Transformation
The long type can be automatically converted to float but may lose precision.
Conversion of type int to char requires a forced transformation.
But the char-to-int is not required to cast.
3. Type promotion issues in expressions.

Java automatic type conversion and coercion type conversion