Java Tutorial
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Object Oriented Programming
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Java Built-in Classes
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Java File Handling
- Java - Files
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Java Error & Exceptions
- Java - Exceptions
- Java - try-catch Block
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Java Multithreading
- Java - Multithreading
- Java - Thread Life Cycle
- Java - Creating a Thread
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Java Synchronization
- Java - Synchronization
- Java - Block Synchronization
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- Java - Inter-thread Communication
- Java - Thread Deadlock
- Java - Interrupting a Thread
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Java Networking
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- Java - URL Class
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Java Collections
Java List Interface
Java Queue Interface
Java Map Interface
- Java - Map Interface
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- Java - The IdentityHashMap Class
Java Set Interface
- Java - Set Interface
- Java - HashSet
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- Java - LinkedHashSet
- Java - SortedSet Interface
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Java Data Structures
- Java - Data Structures
- Java - Enumeration
- 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
- 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
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- Java - Base64 Encode Decode
- Java - Switch Expressions
- Java - Teeing Collectors
- Java - Microbenchmark
- Java - Text Blocks
- Java - Null Pointer Exception
- Java - Packaging Tools
- Java - Sealed Classes
- Java - Record Classes
- Java - Hidden Classes
- Java - Compact Number Formatting
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.
Answer : B
Explaination
True, Compile time error will occur if an int variable is compared with Boolean variable.
Answer : D
Explaination
The long data type is represented by 64-bit two's complement integer.
Minimum value: -263
Maximum value: 263-1
Answer : B
Explaination
Short variable has default value of 0 if defined as an instance/static variable.
Q 4 - Which of the following is true about String?
Answer : B
Explaination
String object is immutable so that once it is created a String object cannot be changed. Since String is immutable it can safely be shared between many threads which are considered very important for multithreaded programming.
Q 5 - What is an immutable object?
A - An immutable object can be changed once it is created.
B - An immutable object can't be changed once it is created.
C - An immutable object is an instance of an abstract class.
Answer : B
Explaination
An immutable object can't be changed once it is created. String objects are immutable.
Answer : B
Explaination
No, this is not possible.
Q 7 - What is function overriding?
Answer : B
Explaination
If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding.
Q 8 - What happens when thread's sleep() method is called?
A - Thread returns to the ready state.
Answer : B
Explaination
When a task invokes its sleep() method, it returns to the waiting state.
Answer : B
Explaination
It is not necessary that each try block must be followed by a catch block. It should be followed by either a catch block or a finally block.
Q 10 - Which of the following is Faster, StringBuilder or StringBuffer?
Answer : A
Explaination
StringBuilder is faster than StringBuffer.
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