Java Programming In-Depth: Key Insights from《Java Core Technology》.rar
- In the realm of Java programming, extracting the fourth bit from the right of an integer 'n' involves bitwise operations. This can be achieved by computing (n & 8)/8 or (n & (1<<3)) >> 3. 2. Regarding shift operations, '>>>' signifies filling the preceding bits with zeros, while '>>' fills them with the sign bit. It's essential to note that Java lacks the left shift operator '<<'. 3. The right operand in shift operators must undergo modulo 32 computation (or modulo 64 for long variables). For instance, 1<<35 is equivalent to 1<<3, resulting in 8. 4. In floating-point operations, processors may utilize varying bit lengths for storage, truncating the final result within a 64-bit range to prevent exponent overflow. Methods adorned with 'Strictfp' demand rigorous floating-point operations for portability. 5. For cases where obtaining entirely predictable results is more crucial than raw performance, the usage of the 'StrictMath' class is recommended. 6. Valid conversion between numeric types in Java is an important consideration, as outlined on page 44 of 'Java Core Technology'. 7. Boolean values cannot undergo forced type conversion with any numeric type. Additionally, only string constants are shared, while expression constants do not share their results. '==' is used to determine whether two strings are in the same position.