The method of basic data type conversion in java
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Recently, I have taken some time to extract some basic toolkits from lucene's open source code, which involves a lot of bit operations and data type conversions. Here is a summary of data type conversions. There are two types of basic data type conversion, the first is upward transformation, and the second is forced downward transformation.
1. Upward transformation is also called automatic promotion. It is easy to understand that wide data types can be compatible with narrow data types:
Byte-> short
Byte, short, char-> int
Byte, short, char, int-> long
Byte, short, char, int, long-> float
Byte, short, char, int, long, float-> double
Note: although byte is only 8 bytes long, it cannot be automatically promoted to char because char is an unsigned integer value, and short cannot be automatically converted to char by the same token.
When performing expression evaluation, byte, short, and char are automatically promoted to int type. On this basis, if there is a long value, it will be automatically promoted to long, if there is a float value, it will be automatically raised to float, and if there is a float value, it will be automatically raised to double.
2. The downward transition is also called forced conversion.
The cast for shaping is to truncate the high position and then represent the value according to the complement rule.
For double strong conversion to float and floating point strong conversion to plastic surgery seems to be more complex, because the work did not encounter this situation, so we will analyze it later.
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