![Java Tutorial](/java/images/java-mini-logo.jpg)
Java Tutorial
- Java - Home
- Java - Overview
- Java - History
- Java - Features
- Java vs C++
- Java Virtual Machine (JVM)
- Java - JDK vs JRE vs JVM
- Java - Hello World Program
- Java - Environment Setup
- Java - Basic Syntax
- Java - Variable Types
- Java - Data Types
- Java - Type Casting
- Java - Unicode System
- Java - Basic Operators
- Java - Comments
Java Control Statements
- Java - Loop Control
- Java - Decision Making
- Java - If-else
- Java - Switch
- Java - For Loops
- Java - For-Each Loops
- Java - While Loops
- Java - do-while Loops
- Java - Break
- Java - Continue
Object Oriented Programming
- Java - OOPs Concepts
- Java - Object & Classes
- Java - Class Attributes
- Java - Class Methods
- Java - Methods
- Java - Variables Scope
- Java - Constructors
- Java - Access Modifiers
- Java - Inheritance
- Java - Aggregation
- Java - Polymorphism
- Java - Overriding
- Java - Method Overloading
- Java - Dynamic Binding
- Java - Static Binding
- Java - Instance Initializer Block
- Java - Abstraction
- Java - Encapsulation
- Java - Interfaces
- Java - Packages
- Java - Inner Classes
- Java - Static Class
- Java - Anonymous Class
- Java - Singleton Class
- Java - Wrapper Classes
- Java - Enums
- Java - Enum Constructor
- Java - Enum Strings
Java Built-in Classes
Java File Handling
- Java - Files
- Java - Create a File
- Java - Write to File
- Java - Read Files
- Java - Delete Files
- Java - Directories
- Java - I/O Streams
Java Error & Exceptions
- Java - Exceptions
- Java - try-catch Block
- Java - try-with-resources
- Java - Multi-catch Block
- Java - Nested try Block
- Java - Finally Block
- Java - throw Exception
- Java - Exception Propagation
- Java - Built-in Exceptions
- Java - Custom Exception
Java Multithreading
- Java - Multithreading
- Java - Thread Life Cycle
- Java - Creating a Thread
- Java - Starting a Thread
- Java - Joining Threads
- Java - Naming Thread
- Java - Thread Scheduler
- Java - Thread Pools
- Java - Main Thread
- Java - Thread Priority
- Java - Daemon Threads
- Java - Thread Group
- Java - Shutdown Hook
Java Synchronization
- Java - Synchronization
- Java - Block Synchronization
- Java - Static Synchronization
- Java - Inter-thread Communication
- Java - Thread Deadlock
- Java - Interrupting a Thread
- Java - Thread Control
- Java - Reentrant Monitor
Java Networking
- Java - Networking
- Java - Socket Programming
- Java - URL Processing
- Java - URL Class
- Java - URLConnection Class
- Java - HttpURLConnection Class
- Java - Socket Class
- Java - Generics
Java Collections
Java Interfaces
- Java - List Interface
- Java - Queue Interface
- Java - Map Interface
- Java - SortedMap Interface
- Java - Set Interface
- Java - SortedSet Interface
Java Data Structures
Java Collections Algorithms
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
- Java - Autoboxing and Unboxing
- Java - File Mismatch Method
- Java - REPL (JShell)
- Java - Multi-Release Jar Files
- Java - Private Interface Methods
- Java - Inner Class Diamond Operator
- Java - Multiresolution Image API
- Java - Collection Factory Methods
- Java - Module System
- Java - Nashorn JavaScript
- Java - Optional Class
- Java - Method References
- Java - Functional Interfaces
- Java - Default Methods
- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Dynamic CDS archive
- Java - Z Garbage Collector (ZGC)
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
- Java - Record Classes
- Java - Hidden Classes
- Java - Pattern Matching
- Java - Compact Number Formatting
- Java - Garbage Collection
- Java - JIT Compiler
Java Miscellaneous
- Java - Recursion
- Java - Regular Expressions
- Java - Serialization
- Java - Strings
- Java - Process API Improvements
- Java - Stream API Improvements
- Java - Enhanced @Deprecated Annotation
- Java - CompletableFuture API Improvements
- Java - Streams
- Java - Datetime Api
- Java 8 - New Features
- Java 9 - New Features
- Java 10 - New Features
- Java 11 - New Features
- Java 12 - New Features
- Java 13 - New Features
- Java 14 - New Features
- Java 15 - New Features
- Java 16 - New Features
Java APIs & Frameworks
Java Class References
- Java - Scanner Class
- Java - Arrays Class
- Java - Strings
- Java - Date & Time
- Java - ArrayList
- Java - Vector Class
- Java - Stack Class
- Java - PriorityQueue
- Java - LinkedList
- Java - ArrayDeque
- Java - HashMap
- Java - LinkedHashMap
- Java - WeakHashMap
- Java - EnumMap
- Java - TreeMap
- Java - The IdentityHashMap Class
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - TreeSet
- Java - BitSet Class
- Java - Dictionary
- Java - Hashtable
- Java - Properties
- Java - Collection Interface
- Java - Array Methods
Java Useful Resources
Java 10 - Local Variable Type Inference
JEP 286 − Local Variable Type Inference
Local Variable Type Inference is one of the most evident change to language available from Java 10 onwards. It allows to define a variable using var and without specifying the type of it. The compiler infers the type of the variable using the value provided. This type inference is restricted to local variables.
Old way of declaring local variable.
String name = "Welcome to tutorialspoint.com";
New Way of declaring local variable.
var name = "Welcome to tutorialspoint.com";
Now compiler infers the type of name variable as String by inspecting the value provided.
Noteworthy points
No type inference in case of member variable, method parameters, return values.
Local variable should be initialized at time of declaration otherwise compiler will not be infer and will throw error.
Local variable inference is available inside initialization block of loop statements.
No runtime overhead. As compiler infers the type based on value provided, there is no performance loss.
No dynamic type change. Once type of local variable is inferred it cannot be changed.
Complex boilerplate code can be reduced using local variable type inference.
Map<Integer, String> mapNames = new HashMap<>(); var mapNames1 = new HashMap<Integer, String>();
Example
Following Program shows the use of Local Variable Type Inference in JAVA 10.
import java.util.List; public class Tester { public static void main(String[] args) { var names = List.of("Julie", "Robert", "Chris", "Joseph"); for (var name : names) { System.out.println(name); } System.out.println(""); for (var i = 0; i < names.size(); i++) { System.out.println(names.get(i)); } } }
Output
It will print the following output.
Julie Robert Chris Joseph Julie Robert Chris Joseph