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Toggle navigationJavamex: Java Tutorials
* Threads
* Java Threading
* Concurrency
* BlockingQueue
* BlockingQueue example: a background logger thread
* ConcurrentHashMap scalability (vs synchronized hash maps)
* Double-checked Locking
* Double-checked Locking
* Java 'final' keyword
* Java 'final' keyword
* Performance of Java 'final'
* Performance of Java 'final'
* The notifyAll() method in Java
* Strings and text in Java
* Synchronizing singletons using the Java class loader
* Tutorial: Synchronization and concurrency in Java 5
* Problems with the Java 1.4 synchronization model
* Synchronization under the hood, and why Java 5 improves it
* The Atomic classes in Java
* The Atomic classes in Java: atomic arrays
* The Atomic classes in Java: AtomicInteger and AtomicLong
* The Atomic classes in Java: AtomicReference
* The Atomic classes in Java: atomic field updaters
* Copy-on-write collections in Java (CopyOnWriteArrayList etc)
* Atomic structures and collections in Java 5: ConcurrentHashMap
* Introduction to queues in Java 5
* Queues in Java 5: the Queue interface
* Atomic structures and collections in Java 5
* Explicit locks in Java 5
* Explicit locks in Java: pre-Java 5 implementation
* Explicit locks: introduction to the Lock interface
* The Java Semaphore class
* The Java Semaphore class: controlling a resource pool
* The synchronized keyword in Java: using a synchronized block
* The synchronized keyword in Java: synchronization with main memory
* Avoiding synchronization with ThreadLocal
* Avoiding synchronization with ThreadLocal (example: sharing Calendar
objects)
* When to use ThreadLocal
* The final keyword in Java
* Synchronization "piggybacking" in Java
* Using blocking queues in Java 5 (in preference to wait/notify)
* The Java BlockingQueue (producer-consumer pattern)
* Safe omission of synchronization
* Synchronization methods in Java
* The volatile keyword in Java
* Dangers of the volatile keyword in Java
* The volatile keyword in Java 5
* Typical use of the volatile keyword in Java
* When to use 'volatile' in Java?
* Using wait(), notify() and notifyAll() in Java
* Using wait() and notify() in Java
* Volatile arrays in Java
* How to use wait()/notify() in Java
* When to use wait()/notify() in Java
* Concurrency
* Programming with Threads in Java
* Thread scheduling
* Coordinating threads with CountDownLatch
* Co-ordinating threads with a CyclicBarrier
* Concordinating threads with a CyclicBarrier: error handling
* Concordinating threads with a CyclicBarrier: parallel sort (1)
* Concordinating threads with a CyclicBarrier: parallel sort (2)
* Concordinating threads with a CyclicBarrier: parallel sort (3)
* Concordinating threads with a CyclicBarrier: parallel sort (4)
* Deadlock and how to prevent it
* How threads work: more details
* Threading with Swing: SwingUtilities.invokeLater
* Thread priorities
* What is Java 'thread priority'?
* Processes and ProcessBuilder in Java
* Processes in Java
* Thread.sleep
* Bugs and issues with Thread.sleep
* Stopping a thread
* Threading with Swing
* Thread interruption in Java
* Thread interruption in Java (ctd)
* Thread methods in Java
* Thread pools in Java
* Controlling the queue with ThreadPoolExecutor
* Constructing Threads and Runnables in Java
* Synchronization and thread safety in Java
* Thread scheduling
* Thread scheduling (ctd): quanta and switching
* Thread scheduling implications in Java
* ThreadPoolExecutor
* Frequent Java threading questions
* The Thread.yield() method
* Collections
* Introductions to Collections (data structures) in Java
* Implementing a hash table in Java with a 64-bit hash function
* Implementing a hash table in Java with a 64-bit hash function (ctd)
* Bloom filters in Java
* Bloom filters: the false positive rate
* Bloom filters: the false positive rate (analysis)
* Bloom filters: the false positive rate (ctd)
* Bloom filters in Java: example implementation
* ConcurrentSkipListMap
* Java Collections: overriding hashCode() and equals()
* Advanced use of hash codes in Java
* Advanced use of hash codes in Java: duplicate elimination
* Advanced use of hash codes in Java: duplicate elimination with a BitSet
* Advanced use of hash codes in Java: keying on hash code
* Advanced use of hash codes in Java: statistics
* Advanced use of hash codes in Java: doing away with the keys
* Writing a hash function in Java: guide to implementing hashCode()
* How the Java String hash function works
* How the Java String hash function works (2)
* Secure hash functions
* Strong and secure hash functions
* Strong (non-secure) hash functions
* Java Collections: introduction to hashing
* The mathematics of hash codes and hashing
* The mathematics of hash codes and hashing: hash code statistics
* Java Collections: hashing and hash maps
* Java Collections: maps
* PriorityQueue
* Example of PriorityQueue: doing a Heapsort
* Sorting data in Java: the compareTo() method of the Comparable interface
* Sorting data in Java: the Comparable interface
* Sorting data in Java: optimising the compareTo() method
* Specifying how to sort data in Java: Comparators
* Specifying how to sort data in Java: an example Comparator
* Implementing an Insertion Sort in Java
* Introduction to sorting data with Java collections
* Performance of the Java sorting algorithm
* Performance of the Java sorting algorithm (ctd)
* Sorting data in Java: how to sort a list of Strings or Integers
* A strong hash function in Java
* A strong hash function in Java: example hash function
* A strong hash function in Java: example hash function
* Introduction to using collections in Java
* Using collections in Java: enumerating items in a list
* Using collections in Java: sets
* Using collections in Java: maps and the HashMap
* Using collections in Java: making your classes work with hash maps and hash
sets
* I/O
* Introduction to Java I/O APIs
* Reading a line at a time from a character stream in Java
* ByteBuffer
* Reading and writing to a byteBuffer
* Reading and writing non-byte types in a byteBuffer
* Reading character streams in Java
* Listening for file system modifications
* WatchServuce: Listening for file system modifications
* Polling WatchService in a separate thread
* WatchServuce: Listening for file system modifications
* Introduction to Java input streams
* How big should my input buffer be?
* Buffering with Java input streams
* Error handling with Java input streams
* Introduction to networking in Java
* Direct buffers
* The Layout of a NIO buffer
* NIO Buffer performance
* Buffer data sources (and backing arrays)
* Introduction to buffers in Java NIO
* Reading and writing arrays to a NIO buffer
* Reading and writing primitive arrays to a NIO buffer
* NIO buffer types
* How to set the byte order of a NIO buffer
* NIO Channels
* Mapped buffers (file mapping)
* StreamCorruptedException
* Data compression using Deflater in Java
* The deflate algorithm: dictionary compression in the Deflater
* Huffman compression in the Deflater
* Configuring the Java Deflater: compression level and strategy
* How to compress data using Deflater in Java
* Transforming data to improve Deflater performance
* Reading GZIP files in Java
* Reading ZIP files in Java
* Reading ZIP files in Java: enumeration and metadata
* Problems with ZIP files in Java
* Introduction to networking
* A simple client and server in Java
* A simple client and server in Java: the "conversation" server-side
* XML/Web
* Introduction to XML in Java
* XML parsing in Java with XPath
* XML parsing in Java with XPath (ctd)
* Parsing XML with SAX: creating a DefaultHandler
* Parsing XML with SAX (in J2ME)
* Using XPath from a Java Applet
* AJAX programming: JavaScript event handlers
* Java and AJAX programming: introduction
* Java/AJAX programming: client-side web page manipulation
* AJAX programming: server-side Java
* AJAX programming: handling AJAX requests and responses from a Servlet
* AJAX programming: using the XMLHttpRequest object
* Java Servlets
* Setting the Content-Length header from a Java Servlet
* How to use Cookies with Java Servlets
* The Java Cookie class: writing cookies
* The Java Cookie class: reading cookies
* The HTTP GET and POST methods explained
* Reading HTTP request headers from a servlet: the referer header
* The user-agent HTTP header
* Setting the HTTP status (response) code from a Java Servlet
* Getting started with servlet development
* Keep-alive connections with Java Servlets
* Tuning keep-alive connections with Java Servlets
* Servlet programming: reading HTTP request parameters
* Reading HTTP request headers from a servlet
* Introduction to Java Servlets: How to pick a servlet hosting company
* How to pick a servlet hosting company: Servlet installation and logistical
issues
* How to pick a servlet hosting company: recommended resource quotas
* Handling sessions in a Servlet: introducing the Session API
* Session synchronization using the Servlet Session API
* Handling sessions in a Servlet
* Setting the buffer size on the Windows command window
* Math
* Mathematical operations in Java
* Basic floating point operations in Java: performance and implementation
* BigDecimal and BigInteger
* Operations and performance of BigDecimal and BigInteger
* Performance of the BigDecimal/BigInteger method()
* Math.exp() in Java
* Floating point primitives in Java
* Methods of the java.util.Math class
* Methods of the java.util.Math class (ctd)
* Karatsuba's algorithm for multiplication
* Generating random numbers in Java: the Java random class and beyond
* Sources of entropy
* Using random numbers for simulations: Random.nextGaussian()
* Random.nextGaussian
* Alternatives to java.util.Random
* Using java.util.Random
* How does java.util.Random work and how good is it?
* Subclassing java.util.Random
* Randomness of bits with LCGs
* 'java.lang.Random' falls "mainly in the planes"
* Multiply-with-carry (MWC) random number generators
* The Numerical Recipes ranom number generator in Java
* How to pick a random sample from a list
* The Java SecureRandom class
* Seeding random number generators
* Seeding random number generators: looking for entropy
* XORShift random number generators in Java
* Introduction to binary numbers
* Binary representation in computing and Java
* Bits and bytes: how computers (and Java) represent numbers
* Number storage in computing: bits and bytes
* Grouping bytes to make common data types and sizes
* Converting to/from hexadecimal in Java
* Crypto
* Java Cryptography
* AES and block ciphers in Java
* Asymmetric (public key) encryption in Java
* Block modes with Java ciphers
* Using block modes and initialisation vectors in Java
* Comparison of encryption ciphers in Java
* Collision attacks
* Encryption: introduction
* Secure hash functions in Java
* Secure hash functions in Java (ctd)
* The Initialisation Vector (IV)
* Encryption key size
* Encryption: keys
* Password-based encryption
* Password-based encryption
* Password-based encryption
* RSA encryption in Java: the RSA algorithm
* RSA encryption in Java
* RSA encryption in Java (ctd)
* RSA key lengths
* Symmetric-key encryption in Java
* Removing the 128-bit key restriction
* DB
* SQL Database access from Java
* Closing JDBC resources
* Connecting to a SQL database with JDBC
* Using prepared statements with JDBC
* Retrieving data from a ResultSet with JDBC
* Executing a statement on a SQL database with JDBC
* How to
* Java programming tutorial: arrays
* Java programming tutorial: arrays (2)
* Java programming tutorial: arrays (sorting)
* Java programming tutorial: using 'if ... else'
* Java programming tutorial: for loops
* Java programming tutorial: nested 'for' loops
* Java programming tutorial: 'if' statements
* Java programming tutorial for beginners
* Combining conditions: logical operators
* Java programming tutorial: objects
* Java programming tutorial: variable names
* Java programming tutorial: variables
* How to get started with Java
* From BASIC to Java: an intrudction to Java for BASIC programmers
* Java for BASIC programmers: event-driven programming
* Java for BASIC programmers: libraries and OS access
* Java for BASIC programmers: speed
* Java for BASIC programmers: development process
* From C to Java: an introduction to Java for C programmers
* Java for C programmers: memory management
* Java for C programmers: lack of pointers
* Java for C programmers: error handling
* Java for C programmers: class libraries
* Java for C programmers: deployment model
* How to get started with Java
* Getting started with Java in NetBeans: adding your first line of Java code
* Getting started with Java in NetBeans
* Profiling
* Java 5 profiling facilities
* How to profile threads in Java 5: putting getThreadInfo() in a loop
* How to profile threads in Java 5: using the ThreadMXBean
* Thread profiling in Java 5: basic thread profiling methodology
* Thread profiling in Java 5: Synchronization issues
* Thread profiling in Java 5: Synchronization issues (2)
* Memory usage in Java
* How to calculate the memory usage of a Java array
* Saving memory used by Java strings: a one-byte-per-character CharSequence
implementation
* Instrumentation: querying the memory usage of a Java object
* Memory usage of Java objects: general guide
* Memory usage of Java Strings and string-related objects
* Memory usage of Java Strings and string-related objects
* How to save memory occupied by Java Strings
* Optimisations made by the Hotspot JIT Compiler
* Getting started with JNI
* The Java Native Interface (JNI)
* JNI data types
* The overhead of native calls in Java
* Regex
* Introduction to regular expressions in Java
* Java regular expressions: capturing groups
* Java regular expressions: alternatives in capturing groups
* Character classes in Java regular expressions
* Using the dot in Java regular expressions
* Using named character classes in Java regular expressions
* Regular expression example: determining IP location from the referrer
string
* Regular expression example: determining IP location from a Google referrer
string
* Regular expression example: determining IP location from a Google referrer
string (2)
* Regular expression example: using multiple expressions to determine IP
location from a referrer string
* Regular expression example: scraping HTML data
* Matching against multi-line strings with Java regular expressions
* Java regular expressions: using non-capturing groups to organise regular
expressions
* Using the Java Pattern and Matcher classes
* When to use the Java Pattern and Matcher classes
* Repititon operators in Java regular expressions
* Repititon operators in Java regular expressions: greedy vs reluctant
* Search and replace with Java regular expressions
* Search and replace with Java regular expressions: using Matcher.find()
* Splitting or tokenising a string with Java regular expressions
* Performance of string tokenisation with Java regular expressions
* Basic regular expressions in Java: using String.matches()
* Thread-safety with regular expressions in Java
* UI
* Swing: User Interfaces in Java
* Anonymous inner classes
* Java Applets
* Java Applets: the JApplet class
* Java Applets
* Swing components gallery
* Basic Swing concepts: events and listeners
* Using JCheckBox
* Using JComponent
* JPanel and Box
* Introduction to Swing layouts
* Coping with different screen sizes
* Text fields and labels
* Giving your Java application a Windows look and feel
* Internationalisation and localisation
* The Java Collator class
* graphics
* Basic image creation in Java with BufferedImage
* Performance of different BufferedImage types
* Saving a BufferedImage as a PNG, JPEG etc
* Setting individual pixels on a BufferedImage
* Overview of digital audio
* Overview of digital audio: sampling
* Overview of digital audio: sampling
* JavaSound: Dealing with audio in Java
* Basic JavaSound concepts: mixers and lines
* Basic JavaSound concepts: mixers and lines (ctd)
* Techniques
* Introduction to the Java reflection API
* Calling a method via reflection in Java: details
* Listing system properties and environment variables in Java
* Reading system properties and environment variables in Java
* Recursion in Java
* How recursion works
* Recursion in Java: memory constraints
* How to return multiple values/objects from a Java method?
* Introductions to Exceptions and error handling in Java
* Exceptions in Java: when to catch and when to throw?
* Exceptions in Java: the 'finally' block
* The exception hierarchy in Java
* Introducing Exceptions in Java
* Recasting exceptions in Java
* When to recast exceptions in Java
* Throwing an exception in Java
* Exceptions in Java: the throws declaration
* Exceptions in Java: the try/catch block
* How uncaught exceptions are handled in Java GUI applications
* How uncaught exceptions are handled in Java
* Unchecked exceptions in Java
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Lambdas in Java
Introduction to lambdas and Streams in Java: introduced in Java 8, see how these
bring more flexibility and and conciseness to your code.
Java lambdas tutorial
Using Threads in Java
An introduction to "raw" threads in Java, looking at the Thread and Runnable
classes and issues such as thread safety. See also: Java and threading
performance on Apple Silicon (M1) vs Intel i7.
Java threads tutorial
Synchronization and concurrency in Java
Aspects of synchronization and concurrency in Java that go beyond basic thread
programming, including how to balance thread-safety and performance
requirements.
Java concurrency tutorial
Java Collections
Java's Collections framework provides a range of key classes for organising data
in memory. How to hash maps work? When should you pick a list versus a set
versus a queue...? How do you ensure your code is thread-safe?
Java collections tutorial
Exceptions in Java
How to use exceptions to manage error flow in Java: how do you throw and catch
exceptions? When do you use the different exception classes? Which exceptions
can be thrown by the JVM?
Java exceptions tutorial
Java mathematics
Doing math in Java: an overview to using math primitives and utility classes.
How do different maths operations perform in Java? How do you perform arbitrary
precision arithmetic?
Java maths tutorial
Random numbers in Java
How to generate random numbers in Java. What are the limitations of
java.lang.Random and when is it not suitable? When and how should you use
ThreadLocalRandom?
Java random tutorial
Java memory usage
How to calculate or query the memory usage of Java objects. How much memory do
strings and other objects take up in Java?
Java memory usage
Java cryptography tutorial
An overview of the main encryption and authentication facilities offered by
Java. How do you encrypt data and files in Java? Which algorithm should you use?
Which key length should you pick?
Java cryptography tutorial
Java I/O
The standard Java I/O libraries: how to read and write to files, sockets; how to
improve Java I/O performance.
Java I/O tutorial
Regular expressions in Java
Tutorial on using regular expressions in Java, including basic expressions with
the String.matches() method plus performance considerations.
Java regex tutorial
JDBC tutorial: database access in Java
How to access databases at a lower level in Java using the JDBC API.
Read JDBC tutorial
Java profiling
Performance profiling in Java: using Java's built-in profiling facilities to
find bottlenecks in your production code.
Java profiling tutorial
Java Servlets
Java Servlets provide a framework for serving dynamic web pages supported by
many cloud services.
Java Servlets tutorial
Data compression in Java
How to use the standard Java compression libraries, including some more advanced
techniques.
Java compression tutorial
Java user interfaces with Swing
How to use Swing, Java's rich and extensible user interface library.
Read tutorial
The Java equivalent of...
Section on how to immitate in Java certain features of other languages, notably
C and C++.
Java equivalents tutorial
How to fix...
What to do with those awkward OutOfMemoryErrors, StackOverflowErrors...
Read tutorial