Java Interview Questions And Answers For Freshers
Comprehensive Guide to Java Interview Questions and Answers for Freshers
Java Interview Questions And Answers For Freshers
In Java interviews for freshers, common questions include topics like OOP concepts, inheritance, polymorphism, encapsulation, abstraction, exception handling, multithreading, collections, and JDBC. Candidates may also be asked to explain the differences between String, StringBuilder, and StringBuffer, or how to handle a particular programming challenge, such as reversing a string or finding the maximum element in an array. It's essential for freshers to not only know the syntax and concepts but also to be able to articulate their thought process and problem-solving skills during the interview. Practice coding exercises and be prepared to discuss your projects and any relevant experience to showcase your understanding and enthusiasm for Java development.
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1 - What is Java? Java is a high level, object oriented programming language that is platform independent, meaning that Java code can run on any system that has a Java Virtual Machine (JVM) installed.
2) What are the main features of Java? Some main features of Java include being simple, secure, portable, and robust. Java also supports multi threading, distributed computing, and object oriented programming principles.
3) What is the difference between JDK, JRE, and JVM? JDK (Java Development Kit) is a software development kit that includes tools needed to develop Java applications, JRE (Java Runtime Environment) is an environment that is required to run Java applications, and JVM (Java Virtual Machine) is an execution environment that runs Java bytecode.
4) What is the main difference between abstract class and interface in Java? An abstract class can have both abstract and non abstract methods, whereas an interface can only have abstract methods. A class can implement multiple interfaces but can only extend one abstract class.
5) What is the difference between an ArrayList and a LinkedList? ArrayList is implemented as a resizable array, while LinkedList is implemented as a doubly linked list. ArrayList provides fast access to elements using index, while LinkedList provides fast insertion and deletion of elements.
6) What is the purpose of the finalize() method in Java? The finalize() method is used for garbage collection. It is called by the garbage collector before an object is destroyed to perform any necessary cleanup actions.
7) What is the difference between static and non static methods? Static methods belong to the class itself and can be called without creating an instance of the class, while non static methods belong to an instance of the class and can only be accessed through an object of the class.
8) What is the difference between StringBuffer and StringBuilder? StringBuffer is synchronized and thread safe, while StringBuilder is not synchronized and therefore faster for single threaded applications. Both classes are used to manipulate strings in Java.
9) What is the difference between equals() and == in Java? The equals() method is used to compare the contents of two objects, while == is used to compare the references of two objects. In Java, == checks for reference equality, while equals() checks for content equality.
10) What is the difference between checked and unchecked exceptions in Java? Checked exceptions are checked at compile time and must be either caught or declared in the method signature using the throws keyword, while unchecked exceptions do not have this requirement. Examples of checked exceptions include IOException, while unchecked exceptions include NullPointerException.
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