- Java - Home
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- JVM - Java Virtual Machine
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- Java - Data Types
- Java - Type Casting
- Java - Unicode System
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Java Operators
- Java - Operators
- Java - Arithmetic Operators
- Java - Assignment Operators
- Java - Relational Operators
- Java - Logical Operators
- Java - Bitwise Operators
- Java Operator Precedence & Associativity
- Java - Unary Operators
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
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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
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- Java - Overriding
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- Java - Dynamic Binding
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- Java - Instance Initializer Block
- Java - Abstraction
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- Java - Static Class
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- Java - Enums
- Java - Enum Constructor
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Java Built-in Classes
- Java - Number
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- Java - Multi-Dimensional Arrays
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- Java - Math Class
Java File Handling
- Java - Files
- Java - Create a File
- Java - Write to File
- Java - Read Files
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- 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 - Marker Interface
- 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.
Q 1 - What is a class in java?
B - class is a special data type.
Answer : A
Explaination
A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.
Answer : A
Explaination
True, a java file can contain one public class and many other non-public classes.
Answer : B
Explaination
Short variable has default value of 0 if defined as an instance/static variable.
Q 4 - Which of the following stands true about default modifier of class members?
A - By default, variables, methods and constructors can be accessed by subclass only.
Answer : C
Explaination
By default, variables, methods and constructors can be accessed by any class lying in the same package.
Q 5 - What is class variable?
A - class variables are static variables within a class but outside any method.
B - class variables are variables defined inside methods, constructors or blocks.
C - class variables are variables within a class but outside any method.
Answer : A
Explaination
Class variables are variables declared with in a class, outside any method, with the static keyword.
Answer : B
Explaination
No, this is not possible.
Q 7 - When static binding occurs?
A - Static binding occurs during Compile time.
B - Static binding occurs during load time.
Answer : A
Explaination
Static binding occurs during Compile time.
Q 8 - Which is the way in which a thread can enter the waiting state?
A - Invoke its sleep() method.
B - invoke object's wait method.
Answer : D
Explaination
A thread can enter the waiting state by invoking its sleep() method, by blocking on IO, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoking its (deprecated) suspend() method.
Answer : B
Explaination
No, constructor cannot be inherited.
Q 10 - In which case, a program is expected to recover?
Answer : B
Explaination
A program is expected to recover if an exception occurs.