Chapter 20 Java Utilities Package and Bit Manipulation (Web design seattle)
Chapter 20 Java Utilities Package and Bit Manipulation 1189 Fig. 20.11 Fig. 20.11 Demonstrating the bitwise shift operators (part 5 of 5). The left shift operator (<<) shifts the bits of its left operand to the left by the number of bits specified in its right operand (performed at line 58 in the program). Bits vacated to the right are replaced with 0s; 1s shifted off the left are lost. The first four output windows of Fig. 20.11 demonstrate the left shift operator. Starting with the value 1, the left shift button was pressed twice, resulting in the values 2 and 4, respectively. The fourth output window shows the result of value1being shifted 31 times. Note that the result is a negative value. That is because a 1 in the high-order bit is used to indicate a negative value in an integer. The right shift operator with sign extension (>>) shifts the bits of its left operand to the right by the number of bits specified in its right operand (performed at line 78 in the program). Performing a right shift causes the vacated bits at the left to be replaced by 0s if the number is positive or 1s if the number is negative. Any 1s shifted off the right are lost. The fifth and sixth output windows show the results of right shifting (with sign extension) the value in the fourth output window two times. The right shift operator with zero extension (>>>) shifts the bits of its left operand to the right by the number of bits specified in its right operand (performed at line 98 in the program). Performing a right shift causes the vacated bits at the left to be replaced by 0s. Any 1s shifted off the right are lost. The eighth and ninth output windows show the results of right shifting (with zero extension) the value in the seventh output window two times. Each bitwise operator (except the bitwise complement operator) has a corresponding assignment operator. These bitwise assignment operators are shown in Fig. 20.12.
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