Java Interview Questions For 1 Year Experience
Common Java Interview Questions for Candidates with 1 Year of Experience
Java is a widely used programming language, and as a candidate with 1 year of experience, you can expect to be asked various questions during an interview. Some common questions may test your understanding of basic Java concepts such as data types, control structures, and object-oriented programming principles. Employers may also inquire about your experience with specific frameworks and technologies, your problem-solving approach, and your ability to work with a team. Additionally, they may ask you to write code or explain your thought process for solving a given scenario. It is important to prepare for these questions by reviewing key concepts and practicing coding exercises to showcase your skills and knowledge in the language.
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ques.
1 - Describe the difference between String, StringBuilder, and StringBuffer.
Answer: String is an immutable class, meaning that its value cannot be changed. StringBuilder and StringBuffer are mutable classes, meaning that their values can be changed. The main difference between StringBuilder and StringBuffer is that StringBuffer is thread-safe, while StringBuilder is not.
2) What is the purpose of the “static” keyword in Java?
Answer: The “static” keyword is used to create variables and methods that can be accessed without creating an instance of a class. This means that the variable or method is shared among all instances of the class.
3) How is an object created in Java?
Answer: To create an object in Java, the “new” keyword is used followed by the name of the class and parentheses containing any necessary arguments.
4) What is a constructor and how is it different from a method?
Answer: A constructor is a special method that is used to initialize objects and is called when an object is created. It is different from a method in that it has the same name as the class and does not have a return type.
5) What is the difference between a deep copy and a shallow copy in Java?
Answer: A deep copy creates a new object with all the values of the original object, while a shallow copy only copies the references to the values.
6) Can you explain the “final” keyword in Java?
Answer: The “final” keyword can be applied to variables, methods, and classes. When applied to a variable, its value cannot be changed. When applied to a method, it cannot be overridden by a subclass. When applied to a class, it cannot be extended.
7) How does Java handle memory management?
Answer: Java uses a garbage collector to automatically free up memory by removing objects that are no longer referenced by the program.
8) What is the difference between an interface and an abstract class?
Answer: An interface contains only abstract methods and cannot be instantiated, while an abstract class can contain both abstract and non-abstract methods and cannot be directly instantiated. A class can implement multiple interfaces but can only extend one abstract class.
9) What is a singleton class in Java?
Answer: A singleton class is a class that can only be instantiated once. This is achieved by making the constructor private and providing a static method to retrieve the instance.
10) What is the purpose of the “synchronized” keyword?
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Answer: The “synchronized” keyword is used to ensure that only one thread can access a block of code at a time, which is necessary for thread safety in a multi-threaded environment.
11) Can you explain the concept of polymorphism in Java?
Answer: Polymorphism refers to the ability of an object to take on multiple forms. This is achieved through method overloading (same method name with different parameters) and method overriding (a method with the same name and parameters in a subclass).
12) How is runtime polymorphism achieved in Java?
Answer: Runtime polymorphism in Java is achieved through method overriding, where a subclass can override a method from its superclass and provide its own implementation.
13) What is the “this” keyword in Java?
Answer: The “this” keyword refers to the current object instance and can be used to access instance variables and methods within a class.
14) What is an abstract method?
Answer: An abstract method is a method that is declared but not implemented in an abstract class. It must be implemented by a subclass.
15) What is a try-catch block and how is it used in Java?
Answer: A try-catch block is used to handle exceptions in Java. The code that may throw an exception is placed in the “try” block, and the code to handle the exception is placed in the “catch” block. It allows the program to continue executing rather than crashing if an exception is encountered.
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