- Java - Home
- Java - Overview
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- Java Vs. C++
- JVM - Java Virtual Machine
- Java - JDK vs JRE vs JVM
- Java - Environment Setup
- Java - Hello World Program
- Java - Comments
- Java - Basic Syntax
- Java - Variables
- Java - Data Types
- Java - Type Casting
- Java - Unicode System
- Java - User Input
- Java - Date & Time
Java Operators
- Java - Operators
- Java - Arithmetic Operators
- Java - Assignment Operators
- Java - Relational Operators
- Java - Logical Operators
- Java - Bitwise Operators
- Java Operator Precedence & Associativity
Java Control Statements
- Java - Decision Making
- Java - If Else Statement
- Java - Switch Statement
- Java - Loop Control
- Java - For Loop
- Java - For-Each Loop
- Java - While Loop
- Java - Do While Loop
- Java - Break Statement
- Java - Continue Statement
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
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- 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
- Java - Arrays
- Java - Strings
- Java - Date
- Java - ArrayList
- Java - Vector
- Java - Stack
- Java - PriorityQueue
- Java - LinkedList
- Java - ArrayDeque
- Java - HashMap
- Java - LinkedHashMap
- Java - WeakHashMap
- Java - EnumMap
- Java - TreeMap
- Java - IdentityHashMap
- Java - HashSet
- Java - EnumSet
- Java - LinkedHashSet
- Java - TreeSet
- Java - BitSet
- Java - Dictionary
- Java - Hashtable
- Java - Properties
- Java - Collection
- Java - Array
Java Useful Resources
Java Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Core Java. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Answer : B
Explaination
True, Compile time error will occur if an int variable is compared with Boolean variable.
Answer : B
Explaination
No, a java file can contain only one public class.
Answer : A
Explaination
double variable has default value of 0.0d if defined as an instance/static variable.
Q 4 - Which of the following is false about String?
B - String can be created using new operator.
Answer : C
Explaination
String is a object.
Q 5 - What is an Interface?
A - An interface is a collection of abstract methods.
B - Interface is an abstract class.
Answer : C
Explaination
An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.
Q 6 - What is an applet?
A - An applet is a Java program that runs in a Web browser.
Answer : A
Explaination
An applet is a Java program that runs in a Web browser.
Q 7 - Static binding uses which information for binding?
Answer : A
Explaination
Static binding uses type information for binding.
Q 8 - What is Serialization?
A - Serialization is the process of writing the state of an object to another object.
B - Serialization is the process of writing the state of an object to a byte stream.
Answer : B
Explaination
Serialization is the process of writing the state of an object to a byte stream.
Answer : A
Explaination
Yes, try statements be nested.
Q 10 - Which of the following is Faster, StringBuilder or StringBuffer?
Answer : A
Explaination
StringBuilder is faster than StringBuffer.