Full Stack Java Developer Interview Questions
Comprehensive List of Interview Questions for Full Stack Java Developers
Full Stack Java Developer Interview Questions cover a wide range of topics related to Java programming language, web development, front-end and back-end development, database management, and other relevant skills. The questions aim to assess the candidate’s understanding of Java, their ability to design and develop user-friendly web applications, their knowledge of frameworks and libraries, and their problem-solving skills. Employers may also ask about the candidate’s experience with agile development, project management, and teamwork. Overall, the interview questions aim to determine if the candidate has the necessary skills and experience to handle the full stack development process using Java.
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questions
1 - What is the difference between JRE, JDK, and JVM?
JRE (Java Runtime Environment) is a software package that provides the environment for executing Java applications. JDK (Java Development Kit) is a software development kit that includes JRE plus development tools. JVM (Java Virtual Machine) is the virtual machine responsible for interpreting and executing Java bytecode.
2) How do you create a thread in Java?
There are two ways to create a thread in Java: by extending the Thread class or by implementing the Runnable interface. Extending the Thread class requires overriding the run() method, whereas implementing Runnable requires implementing the run() method.
3) What is a constructor in Java?
A constructor is a special method used to initialize objects in Java. It has the same name as the class and is called whenever an object of that class is created. It can be used to initialize the variables of an object and perform any other necessary operations during object creation.
4) How does Java handle memory management?
Java uses a garbage collection mechanism to manage memory. This means that the programmer does not have to worry about allocating and deallocating memory for objects. The garbage collector automatically removes objects from memory when they are no longer needed.
5) What is the difference between an ArrayList and a LinkedList?
An ArrayList stores elements in a contiguous block of memory, allowing for fast random access. LinkedList, on the other hand, stores elements in a linked list data structure, allowing for fast insertions and deletions. Therefore, ArrayList is better for retrieving and updating elements, while LinkedList is better for add and remove operations.
6) How do you handle exceptions in Java?
Exceptions in Java can be handled using try-catch blocks. The code that is expected to throw an exception is enclosed in the try block, and if an exception occurs, it is caught in the catch block. The catch block then performs appropriate error handling.
7) What is the difference between a static and non-static method in Java?
A static method belongs to the class and can be accessed without creating an instance of the class. Non-static methods, on the other hand, require an instance of the class to be accessed. Static methods can only access static variables and methods, while non-static methods can access both static and non-static variables and methods.
8) What is the difference between an interface and an abstract class in Java?
An interface is a collection of method signatures, without any implementation. An abstract class can also contain abstract methods, but it can also contain concrete methods with an implementation. A class can implement multiple interfaces but can only extend one abstract class.
9) How do you achieve multi-threading in Java?
Multi-threading in Java can be achieved by creating multiple threads either by extending the Thread class or implementing the Runnable interface. By using these methods, multiple threads can run concurrently and perform different tasks simultaneously.
10) What is the use of the synchronized keyword in Java?
The synchronized keyword in Java is used to create a synchronized block of code. This ensures that only one thread can access the code at a time, preventing multiple threads from conflicting with each other.
11) What is a singleton class in Java?
A singleton class in Java is a class that can only have one instance at a time. This is achieved by making the constructor private and providing a static method to create and return the single instance. This ensures that only one instance of the class is created and shared among all threads.
12) What is the difference between a deep copy and a shallow copy in Java?
A deep copy creates a new object with its own separate copy of all the data contained within the original object. A shallow copy creates a new object that references the same data as the original object. Any changes made to the original object will also affect the shallow copy, but not the deep copy.
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13) How do you implement inheritance in Java?
Inheritance in Java can be implemented by using the extends keyword in the class declaration. This allows the subclass to inherit all the attributes and methods of the parent class, and then add its own unique features.
14) What is the difference between throw and throws in Java?
The throw keyword is used to explicitly throw an exception in a method, while the throws keyword is used to declare which exceptions a method might throw. Methods using the throws keyword must handle the exception with a try-catch block or pass the exception to the calling method to handle.
15) What is the use of the final keyword in Java?
The final keyword in Java can be applied to variables, methods, and classes. When used with a variable, it makes the variable's value cnstant and immutable. When used with a method, it prevents the method from being overridden in a subclass. When used with a class, it prevents the class from being subclassed.
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