Third, Java basic data types + operators

Third, Java basic data types + operators

1. Common Basic Data Types
   • Byte value range of one byte:-128 to 127
   • Short two-byte value range:-32768 to 32767
   • Int value range:-2147483648 to 2147483647
   • Long eight bytes value range :...
   • • Note: The number of bytes and value range of the basic data type are calculated from-(2 ^ (byte * 8-1) to (2 ^ (byte * 8-1) to-1.
2. Think about it:
   1. Int teest1 = 'A' + 'B ';
   2. Char Test2 = 'A' + 'B ';
   3. Char test3 = '中 ';
   • Conclusion: in Java, when char is computed, it is treated as the certificate corresponding to the ASCII code.
3. Thoughts:
   1. Int A = 3;
   2. Int B = a + 3.4f + 5.4;
   • Conclusion: When an integer and a double operation are performed, the calculation result is automatically converted to a high-precision operation.