Java Language
- Getting started with Java Language
- Awesome Book
- Awesome Community
- Awesome Course
- Awesome Tutorial
- Awesome YouTube
- 2D Graphics in Java
- Alternative Collections
- Annotations
- Apache Commons Lang
- AppDynamics and TIBCO BusinessWorks Instrumentation for Easy Integration
- Applets
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- Asserting
- Atomic Types
- Audio
- Autoboxing
- Basic Control Structures
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- C++ Comparison
- Calendar and its Subclasses
- Character encoding
- Choosing Collections
- Class - Java Reflection
- Classes and Objects
- Classloaders
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- Common Java Pitfalls
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- Interfaces
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- Java Agents
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- Java deployment
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- Java Memory Management
- Java Memory Model
- Java Native Access
- Java Native Interface
- Java Performance Tuning
- Java Pitfalls - Exception usage
- Java Pitfalls - Language syntax
- Java Pitfalls - Nulls and NullPointerException
- Java Pitfalls - Performance Issues
- Pitfall - Calling 'new String(String)' is inefficient
- Pitfall - Calling System.gc() is inefficient
- Pitfall - Efficiency concerns with regular expressions
- Pitfall - Interning strings so that you can use == is a bad idea
- Pitfall - Iterating a Map's keys can be inefficient
- Pitfall - Over-use of primitive wrapper types is inefficient
- Pitfall - Small reads / writes on unbuffered streams are inefficient
- Pitfall - String concatenation in a loop does not scale
- Pitfall - The overheads of creating log messages
- Pitfall - Using 'new' to create primitive wrapper instances is inefficient
- Pitfall - Using size() to test if a collection is empty is inefficient.
- Java Pitfalls - Threads and Concurrency
- Java plugin system implementations
- Java Print Service
- Java SE 7 Features
- Java SE 8 Features
- Java Sockets
- Java Virtual Machine (JVM)
- JavaBean
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- JMX
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- JShell
- JSON in Java
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- LinkedHashMap
- List vs SET
- Lists
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- LocalTime
- log4j / log4j2
- Logging (java.util.logging)
- Maps
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- Nashorn JavaScript engine
- Nested and Inner Classes
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- Non-Access Modifiers
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- Object Class Methods and Constructor
- Object Cloning
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- Oracle Official Code Standard
- Packages
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- Polymorphism
- Preferences
- Primitive Data Types
- Process
- Properties Class
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- Reference Data Types
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- Reflection API
- Regular Expressions
- Remote Method Invocation (RMI)
- Resources (on classpath)
- RSA Encryption
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- Security & Cryptography
- Security & Cryptography
- SecurityManager
- Serialization
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- Sets
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- Splitting a string into fixed length parts
- Stack-Walking API
- Streams
- String Tokenizer
- StringBuffer
- StringBuilder
- Strings
- sun.misc.Unsafe
- super keyword
- The Classpath
- The Java Command - 'java' and 'javaw'
- The java.util.Objects Class
- ThreadLocal
- TreeMap and TreeSet
- Type Conversion
- Unit Testing
- Using Other Scripting Languages in Java
- Using the static keyword
- Using ThreadPoolExecutor in MultiThreaded applications.
- Varargs (Variable Argument)
- Visibility (controlling access to members of a class)
- WeakHashMap
- XJC
- XML Parsing using the JAXP APIs
- XML XPath Evaluation
- XOM - XML Object Model
Java LanguageJava Pitfalls - Performance Issues
Introduction
This topic describes a number of "pitfalls" (i.e. mistakes that novice java programmers make) that relate to Java application performance.
Remarks
This topic describes some "micro" Java coding practices that are inefficient. In most cases, the inefficiencies are relatively small, but it is still worth avoiding them is possible.
Java Pitfalls - Performance Issues Related Examples
- Pitfall - Calling 'new String(String)' is inefficient
- Pitfall - Calling System.gc() is inefficient
- Pitfall - Efficiency concerns with regular expressions
- Pitfall - Interning strings so that you can use == is a bad idea
- Pitfall - Iterating a Map's keys can be inefficient
- Pitfall - Over-use of primitive wrapper types is inefficient
- Pitfall - Small reads / writes on unbuffered streams are inefficient
- Pitfall - String concatenation in a loop does not scale
- Pitfall - The overheads of creating log messages
- Pitfall - Using 'new' to create primitive wrapper instances is inefficient
- Pitfall - Using size() to test if a collection is empty is inefficient.
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