Java IO.pdf - Nguyen Dang Binh

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Example 16.5. PercentTable import java.text.*; import java.util.*; public class PercentTable { public static void main(String[] args) { Java I/O NumberFormat percentFormat = NumberFormat.getPercentInstance(Locale.ENGLISH); } } for (double d = 0.0; d
16.4 Specifying Width with FieldPosition Java I/O The Java core API does not include any classes that pad numbers with spaces like the traditional I/O APIs in Fortran, C, and other languages. Part of the reason is that it's no longer a valid assumption that all output is written in a monospaced font on a VT-100 terminal. Therefore, spaces are insufficient to line up numbers in tables. Ideally, if you're writing tabular data in a GUI, you can use a real table component like JTable in the Java foundation classes. If that's not possible, you can measure the width of the string using a FontMetrics object and offset the position at which you draw the string. And if you are outputting to a terminal or a monospaced font, then you can manually prefix the string with the right number of spaces. The java.text.FieldPosition class separates strings into their component parts, called fields. (This is another unfortunate example of an overloaded term. These fields have nothing to do with the fields of a Java class.) For example, a typical date string can be separated into 18 fields including era, year, month, day, date, hour, minute, second, and so on. Of course, not all of these may be present in any given string. For example, 1999 CE includes only a year and an era field. The different fields that can be parsed are represented as public final static int fields (there's that annoying overloading again) in the corresponding format class. The java.text.DateFormat class defines these kinds of fields as mnemonic constants: public static final int ERA_FIELD public static final int YEAR_FIELD public static final int MONTH_FIELD public static final int DATE_FIELD public static final int HOUR_OF_DAY1_FIELD public static final int HOUR_OF_DAY0_FIELD public static final int MINUTE_FIELD public static final int SECOND_FIELD public static final int MILLISECOND_FIELD public static final int DAY_OF_WEEK_FIELD public static final int DAY_OF_YEAR_FIELD public static final int DAY_OF_WEEK_IN_MONTH_FIELD public static final int WEEK_OF_YEAR_FIELD public static final int WEEK_OF_MONTH_FIELD public static final int AM_PM_FIELD public static final int HOUR1_FIELD public static final int HOUR0_FIELD public static final int TIMEZONE_FIELD Number formats are a little simpler. They are divided into only two fields, the integer field and the fraction field. These are represented by the mnemonic constants NumberFormat.INTEGER_FIELD and NumberFormat.FRACTION_FIELD: public static final int INTEGER_FIELD public static final int FRACTION_FIELD The integer field is everything before the decimal point. The fraction field is everything after the decimal point. For instance, the string "-156.32" has an integer field of "-156" and a fraction field of "32". The java.text.FieldPosition class identifies the boundaries of each field in the numeric string. You can then manually add the right number of monospaced characters or pixels to 408
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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
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Java I/O Normally, the name argumen
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% java FancyZipLister temp.zip test
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Java I/O All high-order Unicode byt
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Java I/O the files to be stored in
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9.3.3.2 Open the next zip entry Jav
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Java I/O Better checksum schemes us
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} } int b; while ((b = in.read()) !
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Java I/O example, under Unix, to ma
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Java I/O archive. If the signatures
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Java I/O public JarFile(String file
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Java I/O The java.util.jar.Attribut
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9.5.7 Manifest Java I/O What the ja
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public ZipEntry getNextEntry() thro
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Java I/O so throw a java.lang.Unsup
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within the space of the next few li
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Chapter 10. Cryptographic Streams J
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Java I/O • It should be difficult
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Figure 10.1. The four steps to calc
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Java I/O you only want to detect si
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public void reset() Java I/O In pra
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Java I/O After each successful call
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} byte[] result = md.digest(); for
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} } catch (Exception e) {System.err
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public class EasyFileDigest { publi
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Java I/O them your encryption (publ
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Java I/O DES, triple DES (DESede),
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IDEA RC2 RC4 Blowfish Java I/O The
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Figure 10.2. Encrypting data Java I
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} } catch (NoSuchAlgorithmException
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} } Java I/O } catch (InvalidKeySpe
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SecretKey blowfishKey = blowfishKey
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Java I/O public final byte[] doFina
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Java I/O A CipherInputStream object
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10.6.2 CipherOutputStream CipherOut
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} } byte[] newDigest = sha.digest()
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} } else if (args[firstFile].equals
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Java I/O Note how little we had to
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Chapter 11. Object Serialization Ja
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Java I/O To write an object onto a
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Java I/O Needless to say, this is a
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Java I/O java.awt.image.renderable
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Java I/O are not serializable, then
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11.5.1.5 Making nonserializable fie
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Java I/O output streams, but DataIn
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Figure 11.2. The serialver GUI Java
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public SerializableZipFile(File fil
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public class NetworkWindow extends
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private void writeObject(ObjectOutp
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} } Vector v = (Vector) oin.readObj
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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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Page 366 and 367: Java I/O String openingLineInUnicod
Page 368 and 369: Java I/O For example, given some Wr
Page 370 and 371: The flush() and close() methods flu
Page 372 and 373: 15.4 The InputStreamReader Class Th
Page 374 and 375: Java I/O Similarly, to write text i
Page 376 and 377: Java I/O These methods behave like
Page 378 and 379: Java I/O Since string objects are i
Page 380 and 381: This class has three constructors t
Page 382 and 383: Do not use the newLine() method if
Page 384 and 385: Example 15.5. The cat Program impor
Page 386 and 387: There are four constructors in this
Page 388 and 389: PipedReader pr = new PipedReader();
Page 390 and 391: Example 15.7. SourceReader package
Page 392 and 393: Java I/O question is what to do if
Page 394 and 395: Java I/O numeric data. If they choo
Page 396 and 397: } public boolean isText() { if (thi
Page 398 and 399: default: } } else { LittleEndianInp
Page 400 and 401: public void init() { } this.addWind
Page 402 and 403: Chapter 16. Formatted I/O with java
Page 404 and 405: Java I/O variable salary 12 places
Page 406 and 407: Hebrew Hebrew Israel iw Hungarian R
Page 408 and 409: For example: Java I/O NumberFormat
Page 410 and 411: public void setMaximumIntegerDigits
Page 412 and 413: Java I/O Like other aspects of text
Page 416 and 417: Java I/O align the decimal points i
Page 418 and 419: Figure 16.1. The PrettiestTable app
Page 420 and 421: Java I/O This whole class is just a
Page 422 and 423: Java I/O Most number formats are in
Page 424 and 425: public int getMultiplier() public v
Page 426 and 427: Arabic (Saudi Arabia) Arabic (Sudan
Page 428 and 429: Slovak #,##0.### -1 234,56 #,##0.00
Page 430 and 431: 16.6.2.1 Utility methods Java I/O F
Page 432 and 433: ** * Concrete class for formatting
Page 434 and 435: } String integerField = digits.subs
Page 436 and 437: Chapter 17. The Java Communications
Page 438 and 439: javax.comm.CommPortIdentifier@be4c9
Page 440 and 441: } } } switch(com.getPortType()) { c
Page 442 and 443: Java I/O In this example, you see t
Page 444 and 445: 17.2.5 Registering Ports For comple
Page 446 and 447: } public void run() { } try { byte[
Page 448 and 449: Java I/O The output buffer size is
Page 450 and 451: Java I/O Here's the results for bot
Page 452 and 453: Java I/O If the requested values ar
Page 454 and 455: Figure 17.1. PC DB-25 serial port t
Page 456 and 457: public abstract void setRTS(boolean
Page 458 and 459: Java I/O Steps 1 and 2 should be fa
Page 460 and 461: Java I/O standard messages on other
Page 462 and 463: 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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