Rabbit and Tortoise Technology Solutions Python Developer Interview Questions and Answers

The default value of an int in Java is 0.

• In Java, when an int variable is declared but not initialized, it is automatically assigned the default value of 0.

• For example, int num; // num is assigned the default value of 0.

Yes, the default value of an int in Java is 0.

• In Java, when an int variable is declared but not initialized, it will have a default value of 0.

• For example, int num; will have a default value of 0.

• This default value is assigned by the Java Virtual Machine (JVM) when memory is allocated for the variable.

The static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.

• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static blocks are used to initialize static variables.

• Static keyword can also be used to create static nested classes.

The volatile keyword in Java is used to indicate that a variable's value will be modified by different threads.

• Ensures visibility of changes made by one thread to other threads

• Prevents compiler optimizations that could reorder instructions

• Useful for variables accessed by multiple threads without synchronization

• Example: volatile boolean flag = true;

JAVA is a high-level programming language known for its portability, security, and object-oriented features.

• JAVA is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• It is object-oriented, allowing for modular and reusable code

• JAVA is known for its security features, such as sandboxing and encryption

• It is widely used for developing web applications, mobile apps, and enterprise soft

Java related frameworks are tools that provide pre-written code to help developers build applications more efficiently.

• Frameworks like Spring, Hibernate, and Struts are commonly used in Java development.

• They provide libraries, APIs, and tools to simplify the development process.

• Frameworks help with tasks like database access, security, and dependency injection.

• Popular Java frameworks include Spring Boot, JavaServer Fac

JAVA stands for Java Virtual Machine

• JAVA stands for Java Virtual Machine

• It is a programming language that follows the principle of 'write once, run anywhere'

• Java code is compiled into bytecode which can run on any platform with Java Virtual Machine (JVM)

• Examples of Java applications include web applications, mobile apps, and enterprise software

D/W Hashmap and ConcurrentHashmap are both implementations of the Map interface in Java, with the latter being thread-safe.

• D/W Hashmap stands for 'Doubly-Linked Hashmap' and is a custom implementation of a hashmap in Java that maintains insertion order.

• ConcurrentHashmap is a thread-safe implementation of the Map interface in Java, allowing multiple threads to access and modify it concurrently without causing data corru

HashMap is not synchronized and not thread-safe, while ConcurrentHashMap is thread-safe and allows concurrent access.

• HashMap is not synchronized, so it is not safe to use in a multi-threaded environment without external synchronization.

• ConcurrentHashMap uses internal synchronization mechanisms to ensure thread safety, allowing multiple threads to access and modify it concurrently.

• ConcurrentHashMap is designed to handle...read more