Bitwise Operators in Java

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Bitwise Operators
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AND OR XOR NOT
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& | ^ !
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Produces 1 only if both bits are 1. Produces 1 if either bit is 1. Produces 1 if exactly one of the bits is 1. Inverts every bit.
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1100 & 0110 == 0100 1100 | 0110 == 1110 1100 ^ 0110 == 1010 ! 0110 == 1001
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Make sure that you don t mix up the binary and logical operators like & and &&. You should also know that all bitwise operations are commutative: the two operands can be in either order. Bitwise logic can be used in combination with bit masks, sequences of bits crafted to zero in on the bits that you want. To do this, you take advantage of the ways that the bitwise rules interact with 0 and 1. For example, AND a sequence with all 1s, and you get the same sequence back.
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//if the original bit is 1 1 & 1 == 1 //if the original bit is 0 1 & 0 == 0 //so a whole series AND 1s is the same 101100 & 111111 == 101100
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Likewise, AND a sequence with 0s, and you get 0s back, because both bits must be 1 to output a 1, and you know that one of them is 0.
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0 & 1 == 0 0 & 0 == 0 101100 & 000000 == 000000
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You can keep the bits you want and zero out the rest by applying a bit mask.
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//say you want the first three bits 101100 & 111000 == 101000 //everything else was set to 0
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13: Binary Data and ByteArrays
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Example 13-3 uses a bit mask to pull just the green value out of an ARGB pixel.
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EXAMPLE 13-3
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http://actionscriptbible.com/ch13/ex3
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Isolating Values with Bit Masks
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package { import com.actionscriptbible.Example; public class ch13ex3 extends Example { public function ch13ex3() { var rgb:uint = 0xd41153; var g:uint = rgb & 0x00ff00; //remember, f is 15 is 1111. g >>= 8; //you still have to move the bits down trace16(g); //0x11 } public function trace16(n:uint):void { trace("0x" + n.toString(16)); } } }
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Besides the int and uint classes, which are limited to 4 bytes, ActionScript 3.0 provides several classes that support binary operations. These classes have the added bene t of being designed for binary operations, so they are much more convenient to work with than an int. The most important of these classes is ByteArray, which encapsulates a variable-sized binary string. You can think of this as a chunk of memory to which you have access at the byte level. In addition, there are a number of related classes: URLStream and Socket. These give low-level binary access to an HTTP request in progress, or a socket connection to a server ( 28, Communicating with Remote Services ). Regardless of the destination of the bytes, however, you can understand how to read and write them thus, to use all these classes by understanding the common binary stream interfaces IDataInput and IDataOutput. All the concrete classes mentioned ByteArray, URLStream, and Socket implement both of these interfaces. A read-only stream, like a URLStream, would only implement IDataInput. A read-write stream, like Socket, implements both. Quite simply, any time you access binary data, you do so in the same way. The IDataInput and IDataOutput interfaces declare methods that let you read and write objects to a binary stream. With these methods, you can let Flash Player do the work of encoding and decoding various types of data to binary, rather than writing each bit yourself. These methods come in sets, shown in Table 13-2.
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Part II: Core ActionScript 3.0 Data Types
TABLE 13-2
Methods of IDataInput and IDataOutput
IDataInput IDataOutput Notes
readBoolean() readByte() readUnsignedByte() readShort() readUnsignedShort() readInt() readUnsignedInt() readFloat() readDouble() readUTF()
writeBoolean() writeByte() writeUnsignedByte() writeShort() writeUnsignedShort() writeInt() writeUnsignedInt() writeFloat() writeDouble() writeUTF()
Read or write a single byte; 0x00 is false and any other value is true. Read or write a single byte as an int. Read or write a single byte as a uint. Read or write a short integer (16 bits) as an int. Read or write a short integer (16 bits) as a uint. Read or write an integer (32 bits) as an int. Read or write an unsigned integer (32 bits) as a uint. Read or write a single-precision oating point number (32 bits) as a Number. Read or write a double precision oating point number (64 bits) as a Number. Read or write a UTF-8 encoded string pre xed by the length of the string as an unsigned short integer so that no delimiters are needed. Read or write a UTF-8 encoded string with no pre x. readUTFBytes() takes a length parameter specifying the length of the string to read. Read or write a string in any string encoding, passed as a parameter, such as us-ascii or iso-8859-1. The full list of supported character sets can be found in the AS3LR. Read or write raw binary as a ByteArray. Read or write an ActionScript object using AMF encoding. Specify AMF0 or AMF3 using the objectEncoding parameter.
readUTFBytes()
writeUTFBytes()
readMultiByte()
writeMultiByte()
readBytes() readObject()
writeBytes() writeObject()