Java Tutorial
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Java File Handling
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Java Error & Exceptions
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Java Multithreading
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Java Synchronization
- Java - Synchronization
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- Java - Inter-thread Communication
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Java Networking
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Java Collections
Java List Interface
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Java Map Interface
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Java Set Interface
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Java Data Structures
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- Java - BitSet Class
- Java - Dictionary
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Java Collections Algorithms
Advanced Java
- Java - Command-Line Arguments
- Java - Lambda Expressions
- Java - Sending Email
- Java - Applet Basics
- Java - Javadoc Comments
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- 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
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- Java - Base64 Encode Decode
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- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
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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 - Array Methods
- Java - Streams
- Java - Datetime Api
- Java 8 - New Features
- Java 9 - New Features
Java APIs & Frameworks
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 of the following is the default value of a local variable?
Answer : D
Explaination
Local variables are not assigned any value by default.
Answer : C
Explaination
The float data type is represented by single-precision 32-bit IEEE 754 floating point.
Answer : A
Explaination
char variable has default value of '\u0000' if defined as an instance/static variable.
Q 4 - Which of the following is true about public access modifier?
A - Variables, methods and constructors which are declared public can be accessed by any class.
Answer : A
Explaination
Public access modifier is used to make variables, methods and constructors accessible to any class.
Answer : B
Explaination
It is not mandatory to have a default constructor in a class.
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 - What is a transient variable?
A - A transient variable is a variable which is serialized during Serialization.
B - A transient variable is a variable that may not be serialized during Serialization.
C - A transient variable is a variable which is to be marked as serializable.
Answer : B
Explaination
A transient variable is a variable that may not be serialized during Serialization and which is initialized by its default value during de-serialization.
Answer : B
Explaination
No, constructor cannot be inherited.
Q 10 - Which of the following is a marker interface?
Answer : A
Explaination
serializable is a marker interface.
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