Java IO.pdf - Nguyen Dang Binh

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<strong>Java</strong> I/O DES, triple DES (DESede), and password-based encryption (PBE). RSA's payware JSafe product has a security provider that provides the RSA, DES, DESede, RC2, RC4, and RC5 cipher algorithms. Ireland's Baltimore Technologies payware J/Crypto software has a security provider that provides the RSA, DES, DESede, RC2, RC4, and PBE cipher algorithms. Table 10.2 lists several of the available security providers and the algorithms they implement. Product (Company, Country) JDK U.S.) 1.2 (Sun, Table 10.2. Security Providers URL Digests Ciphers License http://java.sun.com/products/jdk/1.2/ JCE (Sun, U.S.) http://java.sun.com/products/jce/index.html JSafe (RSA Data Security, U.S.) http://www.rsa.com/rsa/products/jsafe/ IAIK-JCE (Institute for Applied Information http://wwwjce.iaik.tu-graz.ac.at/product/jce/index.php Processing and Communications, Austria) SHA, MD5 SHA, MD5 SHA, MD5 JCP CDK (JCP Computer http://www.jcp.co.uk/secProducts/security_cdk_index.html Services LTD, U.K.) SHA, MD5 Cryptix (the Internet) J/Crypto (Baltimore Technologies, Ireland) http://www.cryptix.org/ http://www.baltimore.ie/products/jcrypto/index.html Haval, MD2, MD4, MD5, RIPE- MD128, RIPE- MD160, SHA SHA, MD5 None Free Blowfish, DESede, DES, PBE DESede, DES, RC2, RC4, RC5 DESede, DES, IDEA, RC2, RC4 Free Payware Free for noncommercial use DESede, DES, Payware IDEA, RSA, RC4 Blowfish, CAST 5, DES, DESede, El Gamal, IDEA, Open Loki, source RC2, RC4, Safer, Speed, Square DESede, DES, RSA, RC4, PBE Per-copy or per-user royalty Most providers provide some unique algorithms. However, providers usually also include some algorithms already supplied by other providers. At compile time, you do not know which providers will be installed at runtime. Indeed, different people running your program are likely to have different providers available, especially if you ship internationally. Therefore, rather than using constructors, the Cipher class relies on two static getInstance() factory methods that return Cipher objects initialized to support particular transformations: 213
public static final Cipher getInstance(String transformation) throws NoSuchAlgorithmException, NoSuchPaddingException public static final Cipher getInstance(String transformation, String provider) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException <strong>Java</strong> I/O The first argument, transformation, is a string that names the algorithm, mode, and padding scheme to be used to encrypt or decrypt the data. Examples include "DES", "PBEWithMD5AndDES", and "DES/ECB/PKCS5Padding". The optional second argument to getInstance(), provider, names the preferred provider for the requested transformation. If more than one installed provider supports the transformation, the one named in the second argument will be used. Otherwise, an implementation will be selected from any available provider that supports the transformation. If you request a transformation from getInstance() that the provider does not support, a NoSuchAlgorithmException or NoSuchPaddingException will be thrown. If you request a provider that is not installed, a NoSuchProviderException is thrown. The transformation string always includes the name of a cryptographic algorithm: for example, DES. The standard names for common algorithms are listed in Table 10.3. Not all of these algorithms are guaranteed to be available. In fact, JDK 1.2 doesn't supply any of these. If you install JCE, you get access to Blowfish, DES, Triple DES, and PBEWithMD5AndDES. You'll need a third-party provider to use RSA, IDEA, RC2, or RC4. Table 10.3. JCE Standard Algorithm Names Name Algorithm The U.S. Federal government's Data Encryption Standard as defined by NIST in FIPS 46-1 and DES 46-2; a symmetric 64-bit block cipher that uses a 56-bit key; see DESede http://www.itl.nist.gov/div897/pubs/fip46-2.htm. DES e ncryption-d ecryption-e ncryption; triple DES; like DES, a 64-bit symmetric block cipher. DES encryption with one 56-bit key is followed by decryption with a different 56-bit key, which is followed by encryption with a third 56-bit key, effectively providing a 168-bit key space. It is considered possible that the NSA cannot penetrate this algorithm. PBEWithMD5 Password-Based Encryption as defined in RSA Laboratories, "PKCS #5: Password-Based Encryption Standard," Version 1.5, Nov. 1993; based on DES; also requires a salt; see AndDES http://www.rsa.com/rsalabs/pkcs/pkcs-5/index.html. PBEWithMD5 Password-Based Encryption as defined in RSA Laboratories, "PKCS #5: Password-Based Encryption Standard," version 1.5, Nov. 1993; based on DES; also requires a salt and an AndTripleDES initialization vector; see http://www.rsa.com/rsalabs/pkcs/pkcs-5/index.html. The patented Rivest, Shamir, and Adleman asymmetric cipher algorithm; RSA encryption as RSA defined in the RSA Laboratories Technical Note PKCS#1, http://www.rsa.com/rsalabs/pkcs/pkcs-1/index.html. It is considered possible that the NSA cannot penetrate this algorithm. [7] The patent expires in 2000. 7 I have a hunch (not necessarily shared by experts in the field) that RSA and similar algorithms will be broken someday by means much less computationally intensive than brute force search. RSA's strength rests on the difficulty of factoring a large number into two large primes. However, it is not known whether such factorization is fundamentally hard or whether we just don't yet know the right factoring algorithms. It seems obvious to me that there's a lot of structure in the prime numbers that has yet to be exploited or understood by number theorists. For instance, the Goldbach conjecture and the number of prime pairs are still unsolved questions. Therefore, I would not be surprised if far more efficient factorization algorithms are discovered. Any such algorithm would severely reduce the strength of encryption schemes like RSA. Furthermore, there's been an explosion of interest and research in quantum computing, following the discovery that RSA would be much more easily cracked by a quantum computer than by a traditional one. This does not seem to be the case for public-key encryption schemes based on something other than prime factorization, for instance, discrete logarithms or elliptic curves. 214
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Java I/O Elliotte Rusty Harold Publ
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III: Filter Streams ...............
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V: Appendixes .....................
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Preface Java I/O In many ways this
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Java I/O operations from moving byt
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Chapter 9 Chapter 10 Java I/O Chapt
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Chapter 17 Java I/O lining up the d
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Security Issues Java I/O I don't kn
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Java I/O Finally, although many of
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Part I: Basic I/O Java I/O 13
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Java I/O The word stream is derived
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Java I/O The java.util.jar package
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Java I/O For instance, according to
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Java I/O Java understands several d
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Java I/O commonly use an eight-bit
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Java I/O For the most part, these c
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Figure 1.1. An xterm console on Uni
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Java I/O If you absolutely must use
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Java I/O in Apple's Macintosh Runti
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Java I/O to work inside a web brows
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Java I/O bit pattern to a particula
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Java I/O The output is the same as
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OutputStream out = new NullOutputSt
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Figure 2.1. The StreamedTextArea co
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Java I/O When you call read(), you
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Java I/O try { byte[] b = new byte[
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Java I/O Once you have closed an in
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public class StreamCopier { } publi
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Chapter 4. File Streams Java I/O Un
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} } for (int i = 0; i < args.length
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Java I/O The FileOutputStream class
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Java I/O ASCII format is the defaul
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} } } Java I/O if (hex >= 16) Syste
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Java I/O Finally, many HTML files c
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Java I/O In particular, URL connect
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Java I/O Example 5.3 uses these ste
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Java I/O many available ports but o
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Java I/O inspecting the port. It kn
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} } } String response = "Hello " +
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} public void actionPerformed(Actio
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Chapter 6. Filter Streams Java I/O
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Java I/O output stream, out. Among
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Java I/O SourceFile???StringExtract
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6.3 Buffered Streams Java I/O Buffe
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public boolean markSupported() Java
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The compiler rewrites this complica
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public class TeeCopier { } public s
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} } try { FileInputStream fin = new
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} public int available() throws IOE
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public class HexFilter extends Dump
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} } StreamCopier.copy(in, out); in.
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Java I/O the java.io.DataOutput int
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Java I/O Although other schemes are
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} public static void main(String ar
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Java I/O Since Java has no unsigned
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dout.close(); } catch (IOException
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Java I/O The DataInputStream class
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Java I/O The readLine() method read
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7.7 Miscellaneous Methods Java I/O
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public synchronized void write(int
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** * Writes a 4 byte Java float to
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} * possible that this number is te
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*/ public byte readByte(int b) thro
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} Java I/O long byte4 = in.read();
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7.9 Thread Safety Java I/O The Litt
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public static void main(String[] ar
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Table 7.2. Command-Line Switches fo
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} protected void fill() throws IOEx
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Chapter 8. Streams in Memory Java I
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UDP Byte array input and output str
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} } try { // So that the buffer doe
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Java I/O Otherwise, these classes j
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} } catch (IOException e) { // prob
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Java I/O legally unencumbered—tha
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Java I/O if it doesn't, it will com
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Java I/O The first method fills the
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public class DirectDeflater { } pub
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9.1.2.1 Constructing inflaters Ther
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9.1.2.7 An example Java I/O Example
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Java I/O stream itself, without hav
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Java I/O Each inflater input stream
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Java I/O This writes all remaining
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} } } FileOutputStream fout = new F
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} } } catch (IOException e) {System
Page 170 and 171: Java I/O Normally, the name argumen
Page 172 and 173: % java FancyZipLister temp.zip test
Page 174 and 175: Java I/O All high-order Unicode byt
Page 176 and 177: Java I/O the files to be stored in
Page 178 and 179: 9.3.3.2 Open the next zip entry Jav
Page 180 and 181: Java I/O Better checksum schemes us
Page 182 and 183: } } int b; while ((b = in.read()) !
Page 184 and 185: Java I/O example, under Unix, to ma
Page 186 and 187: Java I/O archive. If the signatures
Page 188 and 189: Java I/O public JarFile(String file
Page 190 and 191: Java I/O The java.util.jar.Attribut
Page 192 and 193: 9.5.7 Manifest Java I/O What the ja
Page 194 and 195: public ZipEntry getNextEntry() thro
Page 196 and 197: Java I/O so throw a java.lang.Unsup
Page 198 and 199: within the space of the next few li
Page 200 and 201: Chapter 10. Cryptographic Streams J
Page 202 and 203: Java I/O • It should be difficult
Page 204 and 205: Figure 10.1. The four steps to calc
Page 206 and 207: Java I/O you only want to detect si
Page 208 and 209: public void reset() Java I/O In pra
Page 210 and 211: Java I/O After each successful call
Page 212 and 213: } byte[] result = md.digest(); for
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Page 216 and 217: public class EasyFileDigest { publi
Page 218 and 219: Java I/O them your encryption (publ
Page 222 and 223: IDEA RC2 RC4 Blowfish Java I/O The
Page 224 and 225: Figure 10.2. Encrypting data Java I
Page 226 and 227: } } catch (NoSuchAlgorithmException
Page 228 and 229: } } Java I/O } catch (InvalidKeySpe
Page 230 and 231: SecretKey blowfishKey = blowfishKey
Page 232 and 233: Java I/O public final byte[] doFina
Page 234 and 235: Java I/O A CipherInputStream object
Page 236 and 237: 10.6.2 CipherOutputStream CipherOut
Page 238 and 239: } } byte[] newDigest = sha.digest()
Page 240 and 241: } } else if (args[firstFile].equals
Page 242 and 243: Java I/O Note how little we had to
Page 244 and 245: Chapter 11. Object Serialization Ja
Page 246 and 247: Java I/O To write an object onto a
Page 248 and 249: Java I/O Needless to say, this is a
Page 250 and 251: Java I/O java.awt.image.renderable
Page 252 and 253: Java I/O are not serializable, then
Page 254 and 255: 11.5.1.5 Making nonserializable fie
Page 256 and 257: Java I/O output streams, but DataIn
Page 258 and 259: Figure 11.2. The serialver GUI Java
Page 260 and 261: public SerializableZipFile(File fil
Page 262 and 263: public class NetworkWindow extends
Page 264 and 265: private void writeObject(ObjectOutp
Page 266 and 267: } } Vector v = (Vector) oin.readObj
Page 268 and 269: Java I/O the resolveClass() method
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Example 11.6. Person import java.ut
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public class SealedPoint { } public
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Chapter 12. Working with Files Java
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Java I/O not begin with an @. Under
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Java I/O placing a minus sign befor
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Java I/O rush to snap up all the go
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System Properties System properties
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Java I/O complete list of the ASCII
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Win32 index.html MacOS index.html N
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Java I/O The path argument should b
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Java I/O assume the array returned
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Example 12.2. Paths import java.io.
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String canonicalPath = f.getCanonic
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Java I/O The isHidden() method, onl
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12.3.4 Manipulating Files Java I/O
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fin.close(); src.delete(); Java I/O
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public int hashCode() public boolea
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public class DirList { } File direc
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12.4 Filename Filters Java I/O You
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} } for (int i = 0; i < htmlFiles.l
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public RandomAccessFile(File file,
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Java I/O • Do not parse pathnames
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Figure 13.2. Motif standard Open di
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Java I/O Example 13.1 is a program
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} } // Work around annoying AWT non
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} // Clean up our windows, they won
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13.2.2 Displaying File Choosers Jav
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13.2.5 Custom Dialogs Java I/O File
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Figure 13.4. The choosable file fil
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Example 13.7. JavaChooser import ja
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13.2.7 Selecting Directories Java I
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public void setFileView(fileView) p
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13.2.12.1 Action events Java I/O Wh
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public TextFilePreview(JFileChooser
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13.3 File Viewer, Part 6 Java I/O W
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} } } theView.setText(""); OutputSt
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} } return deflated.isSelected(); p
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Java I/O Chapter 14. Multilingual C
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Java I/O the upper 128 characters o
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makeBlock("Telugu", 0x0C00, 0x0C7F)
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} } for (int i = 0; i < names.lengt
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14.3 Unicode Escapes Java I/O Curre
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0 0 0 0 0 x10 x9 x8 x7 x6 x5 x4 x3
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Character g = new Character('g'); C
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Java I/O two Latin letters. In uppe
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Java I/O tie, and a few similar cha
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Java I/O The most common type of ch
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Java I/O encoding into a new file c
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Java I/O String openingLineInUnicod
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Java I/O For example, given some Wr
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The flush() and close() methods flu
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15.4 The InputStreamReader Class Th
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Java I/O Similarly, to write text i
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Java I/O These methods behave like
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Java I/O Since string objects are i
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This class has three constructors t
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Do not use the newLine() method if
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Example 15.5. The cat Program impor
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There are four constructors in this
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PipedReader pr = new PipedReader();
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Example 15.7. SourceReader package
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Java I/O question is what to do if
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Java I/O numeric data. If they choo
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} public boolean isText() { if (thi
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default: } } else { LittleEndianInp
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public void init() { } this.addWind
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Chapter 16. Formatted I/O with java
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Java I/O variable salary 12 places
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Hebrew Hebrew Israel iw Hungarian R
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For example: Java I/O NumberFormat
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public void setMaximumIntegerDigits
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Java I/O Like other aspects of text
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Example 16.5. PercentTable import j
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Java I/O align the decimal points i
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Figure 16.1. The PrettiestTable app
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Java I/O This whole class is just a
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Java I/O Most number formats are in
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public int getMultiplier() public v
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Arabic (Saudi Arabia) Arabic (Sudan
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Slovak #,##0.### -1 234,56 #,##0.00
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16.6.2.1 Utility methods Java I/O F
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** * Concrete class for formatting
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} String integerField = digits.subs
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Chapter 17. The Java Communications
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javax.comm.CommPortIdentifier@be4c9
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} } } switch(com.getPortType()) { c
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Java I/O In this example, you see t
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17.2.5 Registering Ports For comple
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} public void run() { } try { byte[
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Java I/O The output buffer size is
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Java I/O Here's the results for bot
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Java I/O If the requested values ar
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Figure 17.1. PC DB-25 serial port t
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public abstract void setRTS(boolean
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Java I/O Steps 1 and 2 should be fa
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Java I/O standard messages on other
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Java I/O serial port events: when t
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17.5.5.3 Step 3 Java I/O In many ci
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Appendix A. Additional Resources Ja
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A.5 Data Compression Java I/O Java
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Java I/O "Developing International
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Appendix B. Character Sets Java I/O
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151 epa (end of guarded area) 183
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Java I/O Cp857 DOS ASCII plus Turki
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Java I/O As extensive as this list
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