Advance Java Viva Questions
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Advance Java is a programming language that is used for building enterprise-level applications. It includes various advanced features such as multithreading, networking, database connectivity, and graphical user interfaces. Some common advance Java topics that are commonly asked in viva exams include concepts such as inheritance, polymorphism, exception handling, servlets, JSP, JDBC, and the Spring framework. Students may also be asked to demonstrate their understanding of design patterns, data structures, and algorithms. The purpose of these viva questions is to assess the student's knowledge of advance Java concepts and their ability to apply them in practical scenarios. A good understanding of advance Java is essential for students pursuing a career in software development.
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1 - What is Java?
Java is a high-level, object-oriented programming language developed by Sun Microsystems. It is a platform-independent language, meaning that it can run on any operating system without needing to be recompiled.
2) What are the main features of Java?
The main features of Java include its platform-independence, object-oriented nature, automatic memory management, multi-threading, and exception handling.
3) What is the difference between Java and C++?
Java is a purely object-oriented language, while C++ is a hybrid of both procedural and object-oriented programming. In Java, memory management is handled automatically, whereas in C++, programmers have to manage memory explicitly.
4) What is the Java Virtual Machine (JVM)?
The JVM is an essential component of the Java platform that is responsible for executing Java programs. It acts as a runtime engine that translates Java bytecode into machine code.
5) What is a garbage collector in Java?
The garbage collector is a component of the JVM that automatically manages the memory in a Java program. It frees up memory by removing objects that are no longer in use, thereby preventing memory leaks and improving the program's performance.
6) What is the purpose of the Java Class Library?
The Java Class Library, also known as the Application Programming Interface (API), provides a vast collection of ready-made classes and methods that programmers can use to build their applications quickly. It saves time and effort by eliminating the need to write code from scratch.
7) What is the difference between a class and an object?
A class is a blueprint or template for creating objects, whereas an object is an instance of a class that contains real values instead of placeholders. In simpler terms, a class is a mold, while an object is the actual item produced from that mold.
8) What is the syntax for declaring a class in Java?
The syntax for declaring a class in Java is:
Access Modifier class ClassName {
/* Class body */
}
9) What is inheritance in Java?
Inheritance is a fundamental concept of object-oriented programming where a class can inherit properties and methods from other classes. This helps in creating a hierarchy of classes and encourages code reuse.
10) 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. Additionally, a class can have multiple interfaces, but it can only inherit from one class.
11) What is method overriding in Java?
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Method overriding is the process of redefining a method in a child class that was previously defined in the parent class. It allows a child class to provide its implementation for an inherited method and can modify the behavior of the parent class.
12) What is a constructor in Java?
A constructor is a special method that is used to initialize objects of a class. It has the same name as the class and is called when an object is created using the ‘new’ keyword.
13) What are exceptions in Java?
Exceptions are errors that occur during program execution and can disrupt the normal flow of the program. Java has a robust exception handling mechanism that allows developers to handle these errors gracefully and prevent program crashes.
14) What is multithreading in Java?
Multithreading is the process of having multiple threads of execution within a single program. It allows multiple tasks to run simultaneously and can improve the program's performance.
15) What is a package in Java?
A package is a collection of related classes and interfaces that are used to organize and manage a large codebase. It helps in avoiding naming conflicts between classes and provides better modularity and maintenance.
16) What is the difference between a JDK and a JRE?
JDK stands for Java Development Kit and is a software development environment used to create and compile Java programs. It includes the Java compiler, runtime environment, and other development tools. JRE stands for Java Runtime Environmenand is only used to run Java programs.
17) What is the difference between a static and non-static method?
Static methods belong to a class and are called using the class name, while non-static methods belong to an object and can only be called using an instance of the class.
18) What is the difference between a static and non-static variable?
Static variables are associated with a class and can only have one value for all instances of the class, while non-static variables are unique to each object and can have different values.
19) What is the purpose of the finalize() method?
The finalize() method is called by the garbage collector before reclaiming memory occupied by an object. It is primarily used for performing cleanup operations or releasing external resources before an object is destroyed.
20) What is the difference between a String and a StringBuilder in Java?
Strings are immutable in Java, meaning that their values cannot be changed. On the other hand, StringBuilder is mutable and allows for the manipulation of strings without creating new objects. This makes StringBuilder more efficient for performing string operations.
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