core java

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CONTENTS INCLUDE:
n Java Keywords
n Standard Java Packages
n Character Escape Sequences
n Collections and Common Algorithms
n Regular Expressions
n JAR Files
This refcard gives you an overview of key aspects of the Java
language and cheat sheets on the core library (formatted
output, collections, regular expressions, logging, properties)
as well as the most commonly used tools (javac, java, jar).
Core Java
By Cay S. Horstmann
Java Keywords, continued
About CORE JAVA
Java Keywords
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Keyword Description Example
abstract an abstract class or
method
abstract class Writable {
public abstract void write(Writer out);
public void save(String filename) { ... }
}
assert with assertions enabled,
throws an error if
condition not fulfilled
assert param != null;
Note: Run with -ea to enable assertions
boolean the Boolean type with
values true and false
boolean more = false;
break breaks out of a switch
or loop
while ((ch = in.next()) != -1) {
if (ch == 'n') break;
process(ch);
}
Note: Also see switch
byte the 8-bit integer type byte b = -1; // Not the same as 0xFF
Note: Be careful with bytes < 0
case a case of a switch see switch
catch the clause of a try block
catching an exception
see try
char the Unicode character
type
char input = 'Q';
class defines a class type class Person {
private String name;
public Person(String aName) {
name = aName;
}
public void print() {
System.out.println(name);
}
}
const not used
continue continues at the end of
a loop
while ((ch = in.next()) != -1) {
if (ch == ' ') continue;
process(ch);
}
default the default clause of a
switch
see switch
do the top of a do/while
loop
do {
ch = in.next();
} while (ch == ' ');
double the double-precision
floating-number type
double oneHalf = 0.5;
else the else clause of an if
statement
see if
enum an enumerated type enum Mood { SAD, HAPPY };
extends defines the parent class
of a class
class Student extends Person {
private int id;
public Student(String name, int anId) { ... }
public void print() { ... }
}
final a constant, or a class or
method that cannot be
overridden
public static final int DEFAULT_ID = 0;
finally the part of a try block
that is always executed
see try
float the single-precision
floating-point type
float oneHalf = 0.5F;
for a loop type for (int i = 10; i >= 0; i--)
System.out.println(i);
for (String s : line.split("s+"))
System.out.println(s);
Note: In the “generalized” for loop, the expression
after the : must be an array or an Iterable
goto not used
if a conditional statement if (input == 'Q')
System.exit(0);
else
more = true;
implements defines the interface(s)
that a class implements
class Student
implements Printable {
...
}
import imports a package import java.util.ArrayList;
import com.dzone.refcardz.*;
instanceof tests if an object is an
instance of a class
if (fred instanceof Student)
value = ((Student) fred).getId();
Note: null instanceof T is always false
int the 32-bit integer type int value = 0;
interface an abstract type with
methods that a class can
implement
interface Printable {
void print();
}
long the 64-bit long integer
type
long worldPopulation = 6710044745L;
native a method implemented
by the host system
new allocates a new object
or array
Person fred = new Person("Fred");
null a null reference Person optional = null;
package a package of classes package com.dzone.refcardz;
private a feature that is
accessible only by
methods of this class
see class
protected a feature that is accessible
only by methods of this
class, its children, and
other classes in the same
package
class Student {
protected int id;
...
}
#24

Core Java
2
Primitive types
Java Keywords, continued
public a feature that is
accessible by methods
of all classes
see class
return returns from a method int getId() { return id; }
short the 16-bit integer type short skirtLength = 24;
static a feature that is
unique to its class, not
to objects of its class
public class WriteUtil {
public static void write(Writable[] ws,
String filename);
public static final String DEFAULT_EXT = ".dat";
}
strictfp Use strict rules
for floating-point
computations
super invoke a superclass
constructor or method
public Student(String name, int anId) {
super(name); id = anId;
}
public void print() {
super.print();
System.out.println(id);
}
switch a selection statement switch (ch) {
case 'Q':
case 'q':
more = false; break;
case ' ';
break;
default:
process(ch); break;
}
Note: If you omit a break, processing continues
with the next case.
synchronized a method or code
block that is atomic to
a thread
public synchronized void addGrade(String gr) {
grades.add(gr);
}
this the implicit argument
of a method, or a
constructor of this class
public Student(String id) {this.id = id;}
public Student() { this(""); }
throw throws an exception if (param == null)
throw new IllegalArgumentException();
throws the exceptions that a
method can throw
public void print()
throws PrinterException, IOException
transient marks data that should
not be persistent
class Student {
private transient Data cachedData;
...
}
try a block of code that
traps exceptions
try {
try {
fred.print(out);
} catch (PrinterException ex) {
ex.printStackTrace();
}
} finally {
out.close();
}
void denotes a method
that returns no value
public void print() { ... }
volatile ensures that a field is
coherently accessed
by multiple threads
class Student {
private volatile int nextId;
...
}
while a loop while (in.hasNext())
process(in.next());
Operator Precedence
Operators with the
same precedence
Notes
[] . () (method call) Left to right
! ~ ++ -- + (unary) –
(unary) () (cast) new
Right to left ~ flips each bit of a number
* / % Left to right Be careful when using % with negative
numbers. -a % b == -(a % b), but a
% -b == a % b. For example, -7 % 4
== -3, 7 % -4 == 3.
+ - Left to right
<< >> >>> Left to right >> is arithmetic shift (n >> 1 == n / 2 for
positive and negative numbers), >>> is logical
shift (adding 0 to the highest bits). The right
hand side is reduced modulo 32 if the left hand
side is an int or modulo 64 if the left hand side
is a long. For example, 1 << 35 == 1 << 3.
< <= > >= instanceof Left to right null instanceof T is always false
== != Left to right Checks for identity. Use equals to check for
structural equality.
& Left to right Bitwise AND; no lazy evaluation with bool
arguments
^ Left to right Bitwise XOR
| Left to right Bitwise OR; no lazy evaluation with bool
arguments
&& Left to right
|| Left to right
?: Right to left
= += -= *= /= %= &=
|= ^= <<= >>= >>>=
Right to left
Type Size Range Notes
int 4 bytes –2,147,483,648 to 2,147,483, 647
(just over 2 billion)
The wrapper type is Integer.
Use BigInteger for arbitrary
precision integers.
short 2 bytes –32,768 to 32,767
long 8 bytes –9,223,372,036,854,775,808 to
9,223,372,036,854,775,807
Literals end with L (e.g. 1L).
byte 1 byte –128 to 127 Note that the range is not
0 ... 255.
float 4 bytes approximately
±3.40282347E+38F (6–7
significant decimal digits)
Literals end with F (e.g. 0.5F)
double 8 bytes approximately
±1.79769313486231570E+308
(15 significant decimal digits)
Use BigDecimal for arbitrary
precision floating-point
numbers.
char 2 bytes u0000 to uFFFF The wrapper type is
Character. Unicode
characters > U+FFFF require
two char values.
boolean true or false
Standard Java Packages
java.applet Applets (Java programs that run inside a web page)
java.awt Graphics and graphical user interfaces
java.beans Support for JavaBeans components (classes with properties and
event listeners)
java.io Input and output
java.lang Language support
java.math Arbitrary-precision numbers
java.net Networking
java.nio “New” (memory-mapped) I/O
java.rmi Remote method invocations
java.security Security support
java.sql Database support
java.text Internationalized formatting of text and numbers
java.util Utilities (including data structures, concurrency, regular expressions,
and logging)
Legal conversions between primitive types
Dotted arrows denote conversions that may lose precision.

3
Formatted output with printf
Typical usage
System.out.printf("%4d %8.2f", quantity, price);
String str = String.format("%4d %8.2f", quantity, price);
Each format specifier has the following form. See the tables for
flags and conversion characters.
Flags
Flag Description Example
+ Prints sign for positive and negative numbers +3333.33
space Adds a space before positive numbers | 3333.33|
0 Adds leading zeroes 003333.33
- Left-justifies field |3333.33 |
( Encloses negative number in parentheses (3333.33)
, Adds group separators 3,333.33
# (for f format) Always includes a decimal point 3,333.
# (for x or o
Adds 0x or 0 prefix 0xcafe
format)
$ Specifies the index of the argument to be formatted;
for example, %1$d %1$x prints the first argument in
decimal and hexadecimal
Conversion characters
Formatted output with MessageFormat
Collections and common algorithms
ArrayList An indexed sequence that grows and shrinks dynamically
LinkedList An ordered sequence that allows efficient insertions and removal at
ArrayDeque A double-ended queue that is implemented as a circular array
HashSet An unordered collection that rejects duplicates
TreeSet A sorted set
EnumSet A set of enumerated type values
LinkedHashSet A set that remembers the order in which elements were inserted
PriorityQueue A collection that allows efficient removal of the smallest element
HashMap A data structure that stores key/value associations
TreeMap A map in which the keys are sorted
EnumMap A map in which the keys belong to an enumerated type
LinkedHashMap A map that remembers the order in which entries were added
WeakHashMap A map with values that can be reclaimed by the garbage collector if
List<String> strs = new ArrayList<String>(); Collect strings
strs.add("Hello"); strs.add("World!"); Add strings
for (String str : strs) System.out.println(str); Do something with all elements
Remove elements that match a
condition. The remove method
removes the element returned by
the preceding call to next.
strs.addAll(strColl); Add all strings from another
strs.addAll(Arrays.asList(args)) Add all strings from an array of
strings. Arrays.asList makes a
List wrapper for an array
strs.removeAll(coll); Remove all elements of another
collection. Uses equals for
comparison
Get or set an element at a
specified index
Insert or remove an element at
a specified index, shifting the
elements with higher index values
Convert from collection to array
Convert from array to list. Use
the varargs form to make a small
collection.
Sort a list by the natural order of
the elements, or with a custom
comparator.
Make a map that is traversed in
insertion order (requires hashCode
for key type). Use a TreeMap to
traverse in sort order (requires that
key type is comparable).
Iterate through all entries of the
map
Get or set a value for a given key
Core Java
→
Typical usage:
String msg = MessageFormat.format("On {1, date,
long}, a {0} caused {2,number,currency} of damage.",
"hurricane", new GregorianCalendar(2009, 0, 15).
getTime(), 1.0E8);
Yields "On January 1, 1999, a hurricane caused
$100,000,000 of damage"
n The nth item is denoted by {n,format,subformat} with
optional formats and subformats shown below
n {0} is the first item
n The following table shows the available formats
n Use single quotes for quoting, for example '{' for a literal
left curly brace
n Use '' for a literal single quote
159 9F
< Formats the same value as the previous specification;
for example, %d %<x prints the same number in decimal
and hexadecimal
159 9F
Conversion
Character
Description Example
d Decimal integer 159
x Hexadecimal integer 9f
o Octal integer 237
f Fixed-point floating-point 15.9
e Exponential floating-point 1.59e+01
g General floating-point (the shorter of e and f)
a Hexadecimal floating-point 0x1.fccdp3
s String Hello
c Character H
b boolean true
h Hash code 42628b2
tx Date and time See the next table
% The percent symbol %
n The platform-dependent line separator
any location
they are not used elsewhere
IdentityHashMap A map with keys that are compared by ==, not equals
Common Tasks
in the collection
Iterator<String> iter = strs.iterator();
while (iter.hasNext()) {
String str = iter.next();
if (someCondition(str)) iter.remove();
collection of strings
if (0 <= i && i < strs.size()) {
str = strs.get(i);
strs.set(i, "Hello");
strs.insert(i, "Hello");
str = strs.remove(i);
String[] arr = new String[strs.size()];
strs.toArray(arr);
String[] arr = ...;
List<String> lst = Arrays.asList(arr);
lst = Arrays.asList("foo", "bar", "baz");
List<String> lst = ...;
lst.sort();
lst.sort(new Comparator<String>() {
public int compare(String a, String b) {
return a.length() - b.length();
}
Map<String, Person> map = new
LinkedHashMap<String, Person>();
for (Map.Entry<String, Person> entry :
map.entrySet()) {
String key = entry.getKey();
Person value = entry.getValue();
...
Person key = map.get(str); // null if not found
map.put(key, value);
Character escape sequences
}
}
}
}
b backspace u0008
t tab u0009
n newline u000A
f form feed u000C
r carriage return u000D
" double quote
' single quote
backslash
uhhhh (hhhh is a hex number between 0000 and FFFF) The UTF-16 code point with value hhhh
ooo (ooo is an octal number between 0 and 377) The character with octal value ooo
Note: Unlike in C/C++, xhh is not allowed

4
Regular Expression Formatted Output with MessageFormat, continued Syntax, continued
short 1/15/09
long January 15, 2009
full Thursday, January 15, 2009
short 3:45 PM
long 3:45:00 PM PST
full 3:45:00 PM PST
Core Java
Predefined Character Class Names
Flags for matching
The pattern matching can be adjusted with flags, for example:
Pattern pattern = Pattern.compile(patternString,
Pattern.CASE_INSENSITIVE + Pattern.UNICODE_CASE)
Format Subformat Example
number none 1,234.567
integer 1,235
currency $1,234.57
percent 123,457%
date none or medium Jan 15, 2009
time none or medium 3:45:00 PM
choice List of choices, separated by |. Each choice has
n a lower bound (use -u221E for -∞)
n a relational operator: < for “less than”, # or
u2264 for ≤
n a message format string
For example, {1,choice,0#no houses|1#one
house|2#{1} houses}
Regular Expressions
Characters
c The character c
unnnn, xnn,
0n, 0nn,
0nnn
The code unit with the given hex or octal value
t, n, r,
f, a, e
The control characters tab, newline, return, form feed, alert, and escape
cc The control character corresponding to the character c
Character Classes
[C1C2 . . .] Union: Any of the characters represented by C1C2 , . . .
The Ci are characters, character ranges c1-c2, or character classes.
Example: [a-zA-Z0-9_]
[^C1C2 . . .] Complement: Characters not represented by any of C1C2 , . . .
Example: [^0-9]
[C1&&C2 &&. . .] Intersection: Characters represented by all of C1C2 , . . .
Example: [A-f&&[^G-`]]
Predefined Character Classes
. Any character except line terminators (or any character if the DOTALL
flag is set)
d A digit [0-9]
D A nondigit [^0-9]
s A whitespace character [ tnrfx0B]
S A nonwhitespace character
w A word character [a-zA-Z0-9_]
W A nonword character
p{name} A named character class—see table below
P{name} The complement of a named character class
Boundary Matchers
^ $ Beginning, end of input (or beginning, end of line in multiline mode)
b A word boundary
B A nonword boundary
A Beginning of input
z End of input
Z End of input except final line terminator
G End of previous match
Quantifiers
X? Optional X
X* X, 0 or more times
X+ X, 1 or more times
X{n} X{n,} X{n,m} X n times, at least n times, between n and m times
Quantifier Suffixes
? Turn default (greedy) match into reluctant match
+ Turn default (greedy) match into reluctant match
Set Operations
XY Any string from X, followed by any string from Y
X |Y Any string from X or Y
Grouping
(X) Capture the string matching X as a group
g The match of the gth group
Escapes
c The character c (must not be an alphabetic character)
Q . . . E Quote . . . verbatim
(? . . . ) Special construct—see API notes of Pattern class
Lower ASCII lower case [a-z]
Upper ASCII upper case [A-Z]
Alpha ASCII alphabetic [A-Za-z]
Digit ASCII digits [0-9]
Alnum ASCII alphabetic or digit [A-Za-z0-9]
XDigit Hex digits [0-9A-Fa-f]
Print or Graph Printable ASCII character [x21-x7E]
Punct ASCII nonalpha or digit [p{Print}&&P{Alnum}]
ASCII All ASCII [x00-x7F]
Cntrl ASCII Control character [x00-x1F]
Blank Space or tab [ t]
Space Whitespace [ tnrf0x0B]
javaLowerCase Lower case, as determined by Character.isLowerCase()
javaUpperCase Upper case, as determined by Character.isUpperCase()
javaWhitespace White space, as determined by Character.isWhiteSpace()
javaMirrored Mirrored, as determined by Character.isMirrored()
InBlock Block is the name of a Unicode character block, with spaces
removed, such as BasicLatin or Mongolian.
Category or InCategory Category is the name of a Unicode character category such
as L (letter) or Sc (currency symbol).
Flag Description
CASE_INSENSITIVE Match characters independently of the letter case. By default,
this flag takes only US ASCII characters into account.
UNICODE_CASE When used in combination with CASE_INSENSITIVE, use Unicode
letter case for matching.
MULTILINE ^ and $ match the beginning and end of a line, not the entire input.
UNIX_LINES Only 'n' is recognized as a line terminator when matching ^
and $ in multiline mode.
DOTALL When using this flag, the . symbol matches all characters,
including line terminators.
CANON_EQ Takes canonical equivalence of Unicode characters into account.
For example, u followed by ¨ (diaeresis) matches ü.
LITERAL The input string that specifies the pattern is treated as a sequence
of literal characters, without special meanings for . [ ] etc.
Common Tasks
Regular Expression Syntax
no house
one house
5 houses
String[] words = str.split("s+"); Split a string along white
space boundaries
Pattern pattern = Pattern.compile("[0-9]+");
Matcher matcher = pattern.matcher(str);
String result = matcher.replaceAll("#");
Replace all matches.
Here we replace all digit
sequences with a #.
Pattern pattern = Pattern.compile("[0-9]+");
while (matcher.find()) {
process(str.substring(matcher.start(), matcher.end()));
}
Find all matches.
Pattern pattern = Pattern.compile(
"(1?[0-9]):([0-5][0-9])[ap]m");
for (int i = 1; i <= matcher.groupCount(); i++) {
process(matcher.group(i));
}
Find all groups (indicated
by parentheses in the
pattern). Here we find
the hours and minutes
in a date.

5
Property files
JAR Files
Get a logger for a category
logger.info("Connection successful."); Logs a message of level FINE.
Available levels are SEVERE,
WARNING,INFO,CONFIG,FINE,
FINER, FINEST, with
corresponding methods severe,
warning, and so on.
Logs the stack trace of a
Throwable
logger.setLevel(Level.FINE); Sets the logging level to FINE.
By default, the logging level is
INFO, and less severe logging
messages are not logged.
Adds a file handler for saving the
log records in a file. See the table
below for the naming pattern. This
handler uses a simple formatter
instead of the XML formatter that
is the default for file handlers.
Core Java
n Contain name/value pairs, separated by =, :, or whitespace
n Whitespace around the name or before the start of the
value is ignored
n Lines can be continued by placing an as the last character;
leading whitespace on the continuation line is ignored
button1.tooltip = This is a long
tooltip text.
n t n f r uxxxx escapes are recognized (but not b
or octal escapes)
n Files are assumed to be encoded in ISO 8859-1; use
native2ascii to encode non-ASCII characters into
Unicode escapes
n Blank lines and lines starting with # or ! are ignored
Typical usage:
Properties props = new Properties();
props.load(new FileInputStream("prog.properties"));
String value = props.getProperty("button1.tooltip");
// null if not present
Also used for resource bundles:
ResourceBundle bundle = ResourceBundle.getBundle("prog");
// Searches for prog_en_US.properties,
// prog_en.properties, etc.
String value = bundle.getString("button1.tooltip");
n Used for storing applications, code libraries
n By default, class files and other resources are stored in
ZIP file format
n META-INF/MANIFEST.MF contains JAR metadata
n META-INF/services can contain service provider
configuration
n Use the jar utility to make JAR files
jar Utility Options
Option Description
c Creates a new or empty archive and adds files to it. If any of the specified file
names are directories, the jar program processes them recursively.
C Temporarily changes the directory. For example,
jar cvfC myprog.jar classes *.class
changes to the classes subdirectory to add class files.
e Creates a Main-Class entry in the manifest
jar cvfe myprog.jar com.mycom.mypkg.MainClass files
f Specifies the JAR file name as the second command-line argument. If this
parameter is missing, jar will write the result to standard output (when creating a
JAR file) or read it from standard input (when extracting or tabulating a JAR file).
i Creates an index file (for speeding up lookups in a large archive)
m Adds a manifest to the JAR file.
jar cvfm myprog.jar mymanifest.mf files
M Does not create a manifest file for the entries.
t Displays the table of contents.
jar tvf myprog.jar
u Updates an existing JAR file
jar uf myprog.jar com/mycom/mypkg/SomeClass.class
v Generates verbose output.
x Extracts files. If you supply one or more file names, only those files are
extracted. Otherwise, all files are extracted.
jar xf myprog.jar
O Stores without ZIP compression
LOGGING
Common Tasks
Logger logger =
Logger.getLogger("com.mycompany.myprog.mycategory");
logger.log(Level.SEVERE, "Unexpected exception",
throwable);
Handler handler = new FileHandler("%h/myapp.log",
SIZE_LIMIT, LOG_ROTATION_COUNT);
handler.setFormatter(new SimpleFormatter());
logger.addHandler(handler);
Logging Configuration Files
The logging configuration can be configured through a logging
configuration file, by default jre/lib/logging.properties.
Another file can be specified with the system property java.
util.logging.config.file when starting the virtual machine.
(Note that the LogManager runs before main.)
Configuration Property Description Default
loggerName.level The logging level of the logger by the
given name
None; the logger
inherits the handler
from its parent
handlers A whitespace or comma-separated list
of class names for the root logger. An
instance is created for each class name,
using the default constructor.
java.util.logging.
ConsoleHandler
loggerName.handlers A whitespace or comma-separated list
of class names for the given logger
None
loggerName.
useParenthandlers
false if the parent logger's handlers
(and ultimately the root logger's
handlers) should not be used
true
config A whitespace or comma-separated list
of class names for initialization.
None
java.util.logging.
FileHandler.level
java.util.logging.
ConsoleHandler.level
The default handler level Level.ALL for
FileHandler,
Level.INFO for
ConsoleHandler
java.util.logging.
FileHandler.formatter
java.util.logging.
ConsoleHandler.formatter
The class name of the default filter None
java.util.logging.
FileHandler.formatter
java.util.logging.
ConsoleHandler.formatter
The class name of the default formatter java.util.logging.
XMLFormatter for
FileHandler,
java.util.logging.
SimpleFormatter for
ConsoleHandler
java.util.logging.
FileHandler.encoding
java.util.logging.
ConsoleHandler.encoding
The default encoding default platform
encoding
java.util.logging.
FileHandler.limit
The default limit for rotating log files,
in bytes
0 (No limit), but set
to 50000 in jre/lib/
logging.properties
java.util.logging.
FileHandler.count
The default number of rotated log files 1
java.util.logging.
FileHandler.pattern
The default naming pattern for log files.
The following tokens are replaced when
the file is created:
%h/java%u.log
java.util.logging.
FileHandler.append
The default append mode for file loggers;
true to append to an existing log file
false
Token Description
/ Path separator
%t System temporary directory
%h Value of user.home system property
%g The generation number of rotated logs
%u A unique number for resolving
naming conflicts
%% The % character

Core Java
6
Common javac Options Common java Options
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Option Purpose
-cp or -classpath Sets the class path, used to search for class files. The class path is a
list of directories, JAR files, or expressions of the form directory/'*'
(Unix) or directory* (Windows). The latter refers to all JAR files
in the given directory. Class path items are separated by : (Unix)
or ; (Windows). If no class path is specified, it is set to the current
directory. If a class path is specified, the current directory is not
automatically included—add a . item if you want to include it.
-sourcepath Sets the path used to search for source files. If source and class files
are present for a given file, the source is compiled if it is newer. If no
source path is specified, it is set to the current directory.
-d Sets the path used to place the class files. Use this option to separate
.java and .class files.
-source Sets the source level. Valid values are 1.3, 1.4, 1.5, 1.6, 5, 6
-deprecation Gives detail information about the use of deprecated features
-Xlint:unchecked Gives detail information about unchecked type conversion warnings
Copyright © 2008 DZone, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by means electronic, mechanical, photocopying,
or otherwise, without prior written permission of the publisher. Reference: Core Java, Volume I and Core Java, Volume II, Cay S. Horstmann and Gary Cornell, Sun Microsystems Press, 1996-2007.
Version 1.0
$7.95
ISBN-13: 978-1-934238-26-4
ISBN-10: 1-934238-26-0
9 781934 238264
5 0 7 9 5
ABOUT THE AUTHOR
Core Java, now in
its 8th edition, is a
no-nonsense tutorial
and reliable reference
into all aspects of
Java SE 6.
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Cay S. Horstmann
Cay S. Horstmann has written many books on C++, Java and object-oriented
development, is the series editor for Core Books at Prentice-Hall
and a frequent speaker at computer industry conferences. For four years,
Cay was VP and CTO of an Internet startup that went from 3 people in a
tiny office to a public company. He is now a computer science professor
at San Jose State University. He was elected Java Champion in 2005.
Publications
n Core Java, with Gary Cornell (Sun Microsystems Press 1996–2007)
n Core JavaServer Faces, with David Geary (Sun Microsystems Press 2004–2006)
n Big Java (John Wiley & Sons 2001–2007)
Web Site Blog
http://horstmann.com http://weblogs.java.net/blog/cayhorstmann
Option Purpose
-cp or -classpath Sets the class path, used to search for class files. See the previous
table for details. Note that javac can succeed when java fails if the
current directory is on the source path but not the class path.
-ea or
-enableassertions
Enable assertions. By default, assertions are disabled.
-Dproperty=value Sets a system property that can be retrieved by System.
getProperty(String)
-jar Runs a program contained in a JAR file whose manifest has a
Main-Class entry. When this option is used, the class path is ignored.
-verbose Shows the classes that are loaded. This option may be useful to
debug class loading problems.
-Xmssize
-Xmxsize
Sets the initial or maximum heap size. The size is a value in bytes.
Add a suffix k or m for kilobytes or megabytes, for example, -Xmx10m
Get More FREE Refcardz. Visit refcardz.com now!
Core Seam
Core CSS: Part III
Hibernate Search
Equinox
EMF
XML
JSP Expression Language
ALM Best Practices
HTML and XHTML
Available:
Essential Ruby
Essential MySQL
JUnit and EasyMock
Getting Started with MyEclipse
Spring Annotations
Core Java
Core CSS: Part II
PHP
Getting Started with JPA
JavaServer Faces
Core CSS: Part I
Struts2
Core .NET
Very First Steps in Flex
C#
Groovy
NetBeans IDE 6.1 Java Editor
RSS and Atom
GlassFish Application Server
Silverlight 2
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Design Patterns
Published June 2008
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