visual basic 2008 barcode generator Bitwise Shift Operators in Java

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Bitwise Shift Operators
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So far in this chapter, you learned that the value of a bit can be changed by using the AND bitwise operator and the OR bitwise operators to compare the values of two bits Another way to change the value of a bit is to use bit shifting Bit shifting is the technique of moving (shifting) a bit to either the left or the right position in a binary number Let s see how this works using the following binary number This is equivalent to the decimal value 15:
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We can change the value of each bit by shifting each bit to the right In doing so, the rightmost bit is removed from the value and the leftmost bit is replaced with a zero Here s the new value that results from shifting bits to the right This is equivalent to the decimal value 7:
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Keep in mind that the numeric value of these bits typically is irrelevant to an application that uses bitwise operators For example, you won t shift bits to change a value from 15 to 7 In some applications, such as in network communications, programmers use a bit as a flag rather than a numeric value A bit might be turned on (1) to signify that the program is ready to transmit a message, and a bit can be turned off (0), implying that the program isn t going to transmit a message
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Java has three bitwise operators used to shift bits:
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Left shift (<<) operator Signed right shift (>>) operator Unsigned right shift (>>>) operator
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The left shift operator moves bits one position to the left, dropping the leftmost bit and replacing the rightmost bit with a zero Here how this works Let s shift the following number one bit to the left:
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Here s the value after shifting is completed This is equivalent to the decimal value 30:
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The following example illustrates how to use the bitwise left shift operator in a Java program This example begins by declaring two ints One is initialized to the decimal value 15, and the other is initialized to 0 Next, the left shift operator is used to shift bits to the left The left shift operator requires two operands The left operand contains the value whose bits are being shifted The right operand is an integer that tells Java how many places to shift the bits This example shifts the bits left one position; however, you can change the left operand to any integer If your application needs to shift bits two places, then replace 1 in this statement with 2 After bits are shifted, the resulting value is assigned to a variable and then displayed on the screen
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class Demo { public static void main (String args[]) { int a = 15, c = 0; c = a << 1; Systemoutprintln (" a << 1 = " + c); } }
Two right shift operators are available in Java These are the signed right shift operator (>>) and the unsigned right shift operator (>>>) Both of these operators shift bits to the right by one position, which leaves the leftmost bit position empty The signed right shift operator fills the empty position with a bit whose value represents the sign If the value is a positive number, then the leftmost position is filled with a 0 If the value is a negative number, then the leftmost position is filled with a 1 The signed right shift operator uses the same sign as is used in the value before the bits are shifted Let s use the signed right shift operator to change the value of the following binary value The value of the leftmost bit is significant in this example because
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