Java Technical Interview Questions For Freshers
Expert-Recommended Java Technical Interview Questions for Freshers
Java Technical Interview Questions for Freshers are a set of questions that are designed to evaluate a candidate's knowledge and skills in Java programming. These questions cover topics such as basics of Java, object-oriented programming concepts, data types, control structures, exception handling, and collection framework. They are commonly asked in interviews for entry-level Java positions to assess a candidate's understanding of the language and their ability to solve real-world programming problems. Preparation and practice of these interview questions can help freshers showcase their technical skills and stand out among other candidates.
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-16 points
1 - What is an object in Java?
An object is an instance or a representation of a real-world entity within a computer program. It has properties and behaviors, which are defined by its class.
2) What is a class?
A class is a template or blueprint that describes the properties and behaviors of an object. It acts as a blueprint for creating multiple objects with similar characteristics.
3) What is the difference between a constructor and a method?
A constructor is a special method that is used to initialize an object, while a method is a block of code that performs a specific task.
4) What is the difference between a static and non-static method?
A static method belongs to the class and can be called without creating an object, while a non-static method belongs to an object and must be called using an instance of the class.
5) What is inheritance and how is it implemented in Java?
Inheritance is a concept where one class inherits the properties and behaviors of another class. It is achieved in Java using the extends keyword.
6) What are access modifiers in Java and what is their purpose?
Access modifiers control the visibility and accessibility of classes, methods, and variables. There are four types - public, private, protected, and default. They ensure encapsulation and maintain security of data.
7) What is the difference between an abstract class and an interface?
An abstract class can have both abstract and non-abstract methods, while an interface can only have abstract methods. Also, a class can only extend one abstract class, but can implement multiple interfaces.
8) What is a package in Java?
A package is a mechanism for organizing classes and interfaces into a hierarchical structure. It helps in avoiding naming conflicts and provides easier access to the classes.
9) What is a constructor chaining?
Constructor chaining is a mechanism where one constructor calls another constructor within the same class using the keyword this().
10) What is the difference between a method overloading and overriding?
Method overloading is when a class has two or more methods with the same name but different parameters, while method overriding is when a derived class implements a method with the same name and signature as a method in its superclass.
11) What is polymorphism in Java?
Polymorphism is the ability of an object to take on different forms or behaviors depending on the context. It is achieved through method overloading and overriding.
12) What is the difference between a stack and a queue?
A stack is a Last-In-First-Out (LIFO) data structure, whereas a queue is a First-In-First-Out (FIFO) data structure.
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13) What is the difference between an ArrayList and a LinkedList?
An ArrayList is a resizable array-based data structure, while a LinkedList is a data structure based on pointers to connect each element in the list.
14) What is the finally block used for in a try-catch statement?
The finally block is used to execute a block of code whether an exception is thrown or not. It is often used to release resources like file handles or database connections.
15) What is the purpose of a static block?
A static block is used to initialize static variables in a class. It is executed only once when the class is loaded into memory.
16) What is the difference between checked and unchecked exceptions?
Checked exceptions must be declared in a method's signature or handled using a try-catch block, while unchecked exceptions do not need to be declared or caught. Checked exceptions extend from the Exception class, while unchecked exceptions extend from the RuntimeException class.
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