Java Interview Questions For Freshers Pdf

JAVA

Java Interview Questions For Freshers Pdf

Top Java Interview Questions for Freshers PDF

a interview questions for freshers pdf is a compilation of commonly asked questions during interviews for entry-level Java positions. It covers topics such as basic concepts, data types, control statements, object-oriented programming, exception handling, and more. This document aims to help beginners in their preparation for Java interviews by providing a comprehensive list of questions and answers. It is a valuable resource for those seeking to enhance their knowledge and land their first job in the Java field.

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Various patterns

1 - What is Java?

Java is an object-oriented programming language that was developed by James Gosling in 1991. It is widely used for developing applications such as web and mobile applications, enterprise software, and embedded systems.

2) What are the features of Java?

Java is platform-independent, meaning it can run on any operating system. It is also strongly-typed, meaning the data types of variables are strictly defined. Other features include automatic memory management, built-in multithreading support, and a large standard library.

3) What is the difference between a class and an object in Java?

A class is a template or blueprint from which objects are created. It defines the properties and behaviors that an object will have. An object, on the other hand, is an instance of a class.

4) What is Inheritance?

Inheritance is a mechanism in Java where a new class can be created using properties and methods from an existing class. The new class, called the child class, inherits all the features of the parent class and can also have its own additional features.

5) What is polymorphism?

Polymorphism refers to the ability of an object to have multiple forms. In Java, it allows objects of different classes to be manipulated in a similar way, as long as they have a common parent class.

6) What is abstraction?

Abstraction is the process of hiding unnecessary implementation details and exposing only the essential features. In Java, abstraction is achieved through abstract classes and interfaces.

7) What is encapsulation?

Encapsulation is the process of wrapping data and methods within a single unit, known as an object. It allows for data hiding and ensures that the data is accessed only through predefined methods.

8) What is a constructor?

A constructor is a special method that is used to initialize objects when they are created. It has the same name as the class and is automatically called when an object is instantiated.

9) What is the difference between a static and non-static method?

A static method belongs to the class itself, while a non-static method belongs to an object of the class. This means that a static method can be called without creating an object of the class, whereas a non-static method can only be called through an instance of the class.

10) What is the difference between a local variable and an instance variable?

A local variable is declared within a method and is only accessible within that method. An instance variable is declared within a class and can be accessed by any method within that class.

11) What is the purpose of the final keyword?

The final keyword can be used to denote that a variable, method, or class cannot be changed or overridden. It is often used to create constants or to prevent subclasses from modifying a method or variable.

12) What is a package in Java?

A package is a way of organizing classes and interfaces into a logical group. It helps to avoid naming conflicts and makes it easier to manage large projects.

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13) What is the difference between Interface and Abstract class?

An interface can only have abstract methods and constants, while an abstract class can have both abstract and non-abstract methods. A class can also implement multiple interfaces, but can only extend one abstract class.

14) What is the difference between == and equals() in Java?

The == operator compares the memory addresses of two objects, while the equals() method compares the values of the objects. In most cases, the equals() method is used to compare objects for equality.

15) How can you handle exceptions in Java?

Exceptions can be handled using try-catch blocks where the code that may cause an exception is placed in the try block and the corresponding exception handling logic is placed in the catch block. The finally block is used to execute code regardless of whether an exception is thrown or caught.

 

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