Comcast India Engineering Center Software Engineer2 Interview Questions and Answers

Lambda is an anonymous function while method reference refers to an existing method.

• Lambda expressions are used to create anonymous functions that can be passed as arguments to methods or stored in variables.

• Method references are used to refer to an existing method by name instead of defining a new lambda expression.

• Lambda expressions are more flexible and can be used to create functions with any number of parameters, ...read more

Static variables are shared among all instances of a class, while volatile variables are used for synchronization.

• Static variables are declared with the 'static' keyword and retain their value across multiple function calls.

• Volatile variables are used to indicate that a variable's value can be modified by multiple threads.

• Static variables are stored in the data segment of memory, while volatile variables are stored in ...read more

serialversionuid is a unique identifier used for serialization and deserialization of Java objects.

• serialversionuid is a static field in a class that implements Serializable interface

• It is used to ensure that the same class is used for deserialization as was used for serialization

• If serialversionuid is not specified, JVM generates it based on class structure which can cause issues if class structure changes

• It is recomm...read more

Yes, it should be immutable.

• Immutable keys ensure that the hashcode of the key remains constant, which is important for efficient hashmap operations.

• If a key is mutable, its hashcode can change during its lifetime, leading to unexpected behavior in the hashmap.

• Examples of immutable keys include String, Integer, and other wrapper classes.

Cyclic dependency in Spring

• Cyclic dependency occurs when two or more beans depend on each other directly or indirectly

• It can cause runtime errors like StackOverflowError or BeanCurrentlyInCreationException

• To resolve, use setter injection or constructor injection instead of field injection

• Use @Lazy annotation to delay bean initialization

• Use @Autowired(required = false) to break the cycle