Get Interview Questions and answers on JAVA for freshers with pdf, learn OOPS Concepts, Features, diagrammatic representation, Packages. We assure that you will get here the 90% frequently asked interview questions and answers. The answers to the core java interview questions are short and to. Java Interview Questions i. Java Interview What are the basic interfaces of Java Collections Framework? .. Both implementations share some common.
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Dear readers, these Java Interview Questions have been designed especially any particular question during your interview, normally questions start with some basic concept of the subject and later they continue based on further discussion and what you answer − If you are fresher then interviewer does not expect you. Basic Java Interview Questions and Answers for Freshers or Experienced Pdf. This interview section questions contains a brief introduction to the Java. Java Interview Questions And Answers Pdf Yes, We can execute any code, even before the main method. We are using a static block.
The constructor can never be declared as final because it is never inherited. In other words, we can say that the final variable once assigned to a value, can never be changed after that. It is used for Code Reusability and Method Overriding. A package statement must appear as the first line in a source code file eliminating blank lines and comments. Java has no virtual keyword. A constructor is a special method whose task is to initialize the object of its class. Whenever we run the java program, it is loaded first by the classloader.
Answer- Architecture can be represented as: Question 5- What do you mean by Java Applet? Answer- An applet is a special kind of Java program that is designed to be transmitted over the internet and automatically executed by a Java compatible web browser.
They are downloaded on demand without interacting with user. The following figure explains loading and start-up of an applet. Question 6- How will you define packages in java? Answer- A package is a mechanism for organising the classes. They can be stored in compressed files called JAR files. The Packages in this general purpose language have following features: Package provides a unique namespace for the types it contains.
Answer- When a method of the same name and signature is included in both super and subclasses then the method in the subclass is said to override the method in superclass. Question 8-What do you mean by Multithreaded programming in Java? Answer- A multithreaded program contains two or more parts that can run concurrently.
Each of these part is known as a thread which is the smallest unit of dispatchable code. Each thread defines a separate path of execution.
Question 9- Explain the concept of For Each loop in Java? Answer- It is also known as Enhanced for loop. It is implemented without using no other keyword. If a method throws an exception and it is not handled immediately, then that exception is propagated or thrown to the caller of that method. This propogation continues till it finds an appropriate exception handler ,if it finds handler it would be handled otherwise program terminates Abruptly.
We can create threads in java by any of the two ways: This is first and foremost way to create threads. By implementing runnable interface and implementing run method we can create new thread. Method signature: If multiple threads tries to access a method where method can manipulate the state of object , in such scenario we can declare a method as synchronized.
Finally block is used for cleaning up of resources such as closing connections, sockets etc. If there is exception thrown in try block finally block executes immediately after catch block. If an exception is thrown,finally block will be executed even if the no catch block handles the exception.
From Java 7, we can catch more than one exception with single catch block. This type of handling reduces the code duplication. When we catch more than one exception in single catch block , catch parameter is implicity final. We cannot assign any value to catch parameter.
Skip to content 1. Java Interview Questions And Answers 2.
What is class in Java? What is a JVM? Explain method overloading? Does Java support multiple inheritance? Read Out: Common Interview Mistakes 7.
What is a transient variable? A transient variable is a variable that may not be serialized. Is null a keyword?
No, the null is not a keyword. Java Interview Questions And Answers 9. These methods have been deprecated in JDK 1. What is the immediate superclass of the Applet class? The Panel class is the immediate superclass of the Applet class.
Can we rethrow the same exception from catch handler? The default value of an String type is null. Which containers use a Flow Layout as their default layout?
Java Interview Questions And Answers Which java. What is the Vector class? What is a native method?
What value does read Line return when it has reached the end of a file? What is clipping?
Clipping is the process of confining paint operations to a limited area or shape. Can a for statement loop indefinitely? Explain Java Coding standards for Methods? Explain Java Coding Standards for Constants? Explain Java Coding Standards for variables? Name three Component subclasses that support painting? The Canvas, Frame, Panel, and Applet classes support painting.
Java Virtual Machine For Development Purpose To execute the java programs It provides all the tools, executables and binaries required to compile, debug and execute a Java Program The execution part is handled by JVM to provide machine independence Why Java is not pure Object Oriented language? What are access modifiers? Can we overload main method? What is method in java? Starting with Netscape Navigator 2. Hot Java browser is written with the Java programming language.
Static means one per class, not one for each object no matter how many instance of a class might exist. This means that you can use them without creating an instance of a class. Static methods are implicitly final, because overriding is done based on the type of the object and static methods are attached to a class, not an object. A static method in a superclass can be shadowed by another static method in a sub class, as long as the original method was not declared final.
However, you can't override a static method with a non static method. In other words, you can't change a static method into an instance method of a subclass.