Humancloud Technologies Software Developer Intern Interview Questions and Answers

Keywords for thread safe program in Java

• Synchronization using synchronized keyword

• Using volatile keyword for shared variables

• Using atomic classes for thread safe operations

• Using thread safe collections like ConcurrentHashMap

• Using locks and semaphores for synchronization

• Avoiding shared mutable state

• Using immutable objects

• Using thread local variables

Class modification exception occurs when a class is modified after it has been loaded by the JVM.

• This exception is thrown when a class is modified and then reloaded by the JVM.

• It can occur when a class is modified during runtime or when a new version of a class is loaded.

• This exception can be avoided by using a class loader that isolates the classes from each other.

• An example of this exception is when a method is added...read more

Strong OOPS concept is essential for Java developers to write efficient and maintainable code.

• Understanding of classes, objects, inheritance, polymorphism, and encapsulation

• Ability to design and implement complex systems using OOPS principles

• Experience with design patterns and SOLID principles

• Knowledge of interfaces, abstract classes, and access modifiers

• Familiarity with UML diagrams for modeling software systems

Java is a high-level programming language known for its platform independence and object-oriented approach.

• Java is widely used for developing desktop, web, and mobile applications.

• It is known for its write once, run anywhere (WORA) capability.

• Java uses a virtual machine (JVM) to execute code, providing portability across different operating systems.

• It supports multithreading, exception handling, and dynamic memory allo...read more

Inheritance is a mechanism in object-oriented programming where a new class is created from an existing class.

• Allows for code reuse and promotes code organization

• The new class (subclass) inherits properties and methods from the existing class (superclass)

• Subclass can add new properties and methods or override existing ones

• Example: A Car class can inherit properties and methods from a Vehicle class

A program to calculate the sum of numbers.

• Create a variable to store the sum.

• Iterate through the numbers and add each number to the sum.

• Return the sum.

Java is a high-level, object-oriented programming language used to develop applications for various platforms.

• Java is platform-independent and can run on any device with a Java Virtual Machine (JVM)

• It is known for its security features and is commonly used for developing web applications, mobile apps, and enterprise software

• Java code is compiled into bytecode, which can be executed on any platform that has a JVM instal...read more

Java is a versatile, platform-independent language with a vast community and extensive libraries.

• Java is object-oriented and easy to learn.

• It has a vast community and extensive libraries.

• It is platform-independent and can run on any device.

• Java is secure and reliable.

• It is used in various domains like web development, mobile app development, and enterprise applications.

• Examples: Android apps, Spring framework, Hadoop,