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I was interviewed in Jan 2025.
ArrayList and LinkedList are both implementations of the List interface in Java. ArrayList uses a dynamic array to store elements, while LinkedList uses a doubly linked list.
ArrayList is faster for accessing elements by index, while LinkedList is faster for adding or removing elements in the middle of the list.
ArrayList uses more memory as it needs to allocate space for the entire list upfront, while LinkedList only ne...
Using Java's synchronized keyword for thread synchronization has advantages like simplicity and disadvantages like potential deadlock. ReentrantLock offers more flexibility and control.
Advantages of synchronized keyword: easy to use, built-in support in Java
Disadvantages of synchronized keyword: potential for deadlock, lack of flexibility
ReentrantLock advantages: more control over locking, ability to try and acquire lo...
In Java, == compares memory addresses while .equals() compares values. Improper usage can lead to unexpected results.
Use == to compare primitive data types and object references.
Use .equals() to compare the actual values of objects.
Improper usage of == with objects can lead to comparing memory addresses instead of values.
Improper usage of .equals() can lead to NullPointerException if used with null objects.
The Java garbage collector automatically manages memory by reclaiming unused objects.
Garbage collector runs in the background to reclaim memory from objects no longer in use.
Different types of garbage collection algorithms include Serial, Parallel, CMS, G1, and ZGC.
Serial collector is best for single-threaded applications, while G1 is suitable for large heap sizes.
CMS (Concurrent Mark Sweep) collector minimizes pause t...
Java 8 introduced features like lambdas and Stream API which have revolutionized the way Java applications are written.
Lambdas allow for more concise and readable code by enabling functional programming paradigms.
Stream API provides a way to process collections of objects in a functional style, allowing for easier parallel processing and improved performance.
Java 8 also introduced default methods in interfaces, allowin...
Checked exceptions are checked at compile time, while unchecked exceptions are not. Proper handling involves either catching or declaring the exception.
Checked exceptions must be either caught or declared in the method signature using 'throws'. Example: IOException.
Unchecked exceptions do not need to be caught or declared. Example: NullPointerException.
Proper handling of exceptions involves using try-catch blocks for c...
The Java Memory Model defines how threads interact through memory and how changes made by one thread are visible to others.
Java Memory Model specifies how threads interact with memory, ensuring visibility and consistency.
It defines the rules for reading and writing variables in a multithreaded environment.
Synchronization ensures that only one thread can access a shared resource at a time.
Volatile keyword in Java ensure...
Method overloading involves creating multiple methods in the same class with the same name but different parameters. Method overriding involves creating a method in a subclass that has the same name, return type, and parameters as a method in the superclass.
Method overloading is used to provide different implementations of a method based on the number or type of parameters passed.
Method overriding is used to provide a ...
Functional interfaces in Java are interfaces with a single abstract method. They can be used with lambda expressions for functional programming.
Functional interfaces have only one abstract method, but can have multiple default or static methods.
Lambda expressions can be used to implement the single abstract method of a functional interface concisely.
An example of a custom functional interface is 'Calculator' with a sin
Java Stream is a sequence of elements that supports functional-style operations. It differs from Iterator by allowing for more concise and declarative code.
Streams provide a way to process collections in a functional programming style, allowing for operations like map, filter, and reduce.
Unlike Iterators, Streams do not store elements, making them more memory efficient.
Streams can be parallelized to take advantage of m...
Immutability in Java means that an object's state cannot be changed after it is created. String class achieves immutability by not allowing its value to be modified.
Immutability means that once an object is created, its state cannot be changed.
String class achieves immutability by making its value final and not providing any methods to modify it.
Advantages of immutable objects include thread safety, caching, and easier
final, finally, and finalize have different meanings in Java.
final is a keyword used to declare constants, immutable variables, or prevent method overriding.
finally is a block used in exception handling to execute code after try-catch block.
finalize is a method used for cleanup operations before an object is garbage collected.
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
Create a private static instance of the class.
Make the constructor private to prevent instantiation from outside the class.
Provide a public static method to access the instance, creating it if necessary.
Use synchronized keyword or double-checked locking to ensure thread safety.
Java annotations are metadata that provide data about a program but do not affect the program itself. They are used in frameworks like Spring to simplify configuration and reduce boilerplate code.
Java annotations are used to provide metadata about classes, methods, fields, etc. They are defined using the @ symbol.
In Spring framework, annotations are used to configure various aspects of the application, such as dependen...
Java Streams can handle parallel processing using parallel streams. Pitfalls include increased complexity and potential for race conditions.
Java Streams can utilize parallel processing by using parallel streams, which automatically divide the data into multiple chunks and process them concurrently.
Potential pitfalls of using parallel streams include increased complexity, potential for race conditions, and overhead of m...
I was interviewed in Feb 2025.
I was interviewed in Feb 2025.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
10405090xyzabc interview questions for popular designations
ArrayList and LinkedList are both classes in Java that implement the List interface, but they have different underlying data structures.
ArrayList uses a dynamic array to store elements, providing fast random access but slower insertion and deletion.
LinkedList uses a doubly linked list to store elements, providing fast insertion and deletion but slower random access.
Choose ArrayList when you need fast random access and ...
Using Java's synchronized keyword for thread synchronization has advantages like simplicity and disadvantages like potential deadlock. ReentrantLock offers more flexibility and control.
Advantages of synchronized keyword: simplicity, built-in support in Java
Disadvantages of synchronized keyword: potential for deadlock, lack of flexibility
ReentrantLock offers more control over locking, ability to try and lock with timeou...
In Java, == compares memory addresses while .equals() compares values. Improper usage can lead to unexpected results.
Use == to compare primitive data types or to check if two objects reference the same memory address.
Use .equals() to compare the actual values of objects, such as strings or custom classes.
Improper usage of == with objects can lead to unexpected results as it compares memory addresses, not values.
The Java garbage collector is responsible for automatically managing memory by reclaiming unused objects.
The garbage collector in Java runs in the background and identifies objects that are no longer needed.
There are different types of garbage collection algorithms in Java such as Serial, Parallel, CMS, G1, and ZGC.
Each algorithm has its own way of managing memory and reclaiming unused objects efficiently.
For example, ...
Java 8 introduced features like lambdas and Stream API which have revolutionized the way Java applications are written.
Lambdas allow for more concise and readable code by enabling functional programming paradigms.
Stream API provides a way to process collections of objects in a functional style, making code more expressive and efficient.
Java 8 also introduced default methods in interfaces, allowing for backward compatib...
Checked exceptions are checked at compile time, while unchecked exceptions are not. Proper handling involves either catching or declaring the exception.
Checked exceptions must be either caught or declared in the method signature using the 'throws' keyword.
Unchecked exceptions do not need to be explicitly caught or declared.
Examples of checked exceptions include IOException and ClassNotFoundException, while examples of ...
The Java Memory Model defines how threads interact through memory and how changes made by one thread are visible to others.
Java Memory Model specifies how threads interact with memory
It ensures visibility of changes made by one thread to other threads
Volatile keyword in Java helps ensure visibility by preventing threads from caching variables locally
Volatile variables are always read from and written to main memory, no
Method overloading involves creating multiple methods in the same class with the same name but different parameters. Method overriding involves creating a new implementation of a method in a subclass.
Method overloading is used to provide multiple methods with the same name but different parameters in the same class. Example: void print(int num) and void print(String str)
Method overriding is used to provide a new implem...
Functional interfaces in Java are interfaces with a single abstract method. They can be used with lambda expressions for functional programming.
Functional interfaces have only one abstract method, but can have multiple default or static methods.
Lambda expressions can be used to implement the abstract method of a functional interface concisely.
An example of a custom functional interface is 'Calculator' with a single abs
Java Stream is a sequence of elements that supports functional-style operations. It differs from Iterator by allowing for more concise and declarative code.
Streams are used to process collections in a functional programming style, allowing for operations like filter, map, reduce, etc.
Streams do not store elements, they operate on the source data structure (e.g., List) directly.
Iterators are used to sequentially access ...
Immutability in Java refers to objects whose state cannot be changed after creation. String class achieves immutability by not allowing modifications to its value.
Immutability means that once an object is created, its state cannot be changed.
String class achieves immutability by making its value final and not providing any methods to modify it.
Advantages of immutable objects include thread safety, caching, and easier d
final, finally, and finalize have different meanings in Java.
final is a keyword used to declare constants, immutable variables, or prevent method overriding.
finally is a block used in exception handling to execute code after try-catch block, regardless of an exception.
finalize is a method used for cleanup operations before an object is garbage collected.
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
Create a private static instance of the class.
Make the constructor private to prevent instantiation from outside the class.
Provide a public static method to access the instance, creating it if necessary.
Use synchronized keyword or double-checked locking to ensure thread safety.
Java annotations are metadata that provide data about a program but do not affect the program itself. They are used in frameworks like Spring to simplify configuration and reduce boilerplate code.
Java annotations are used to provide metadata about classes, methods, fields, etc. They are defined using the @ symbol.
In Spring framework, annotations are used to configure various aspects of the application, such as dependen...
Java Streams can handle parallel processing using parallel streams. Pitfalls include increased complexity and potential for race conditions.
Java Streams can be processed in parallel using the parallel() method.
Potential pitfalls of using parallel streams include increased complexity, potential for race conditions, and performance overhead.
To mitigate these pitfalls, ensure that the operations performed on the stream ar...
Java Streams can handle parallel processing using parallel streams. Pitfalls include increased complexity and potential for race conditions.
Java Streams can utilize parallel processing by using parallel streams, which automatically distribute the workload across multiple threads.
Potential pitfalls of using parallel streams include increased complexity, potential for race conditions, and overhead of managing parallelism...
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
I applied via Campus Placement and was interviewed in Dec 2024. There were 5 interview rounds.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
I applied via Campus Placement and was interviewed in Dec 2024. There were 5 interview rounds.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
I applied via Campus Placement and was interviewed in Dec 2024. There were 5 interview rounds.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
I applied via Campus Placement and was interviewed in Dec 2024. There were 5 interview rounds.
I am writing automation and clicking on aptitude test.
I am writing automation and clicking on assignment test.
This is an automation test. I got this task from my senior. I'm doing good.
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