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Java Interview Questions And Answers Pdf Yes, We can execute any code, even before the main method. We are using a static block. In this guide we will discuss about different types of questions that can be used in a Java interview, in order for the employer to test your skills in Java and. 5) Difference between method overloading and method overriding in java? . .. 9. 6) Difference . Core java Interview questions on Coding Standards.

Java Interview Question Answer Pdf

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Dear readers, these Java Interview Questions have been designed the subject and later they continue based on further discussion and what you answer −. I was getting a lot of emails and comments to create java interview questions and answers PDF eBook. It was hard and time taking, but finally, it's done. Get Interview Questions and answers on JAVA for freshers with pdf, learn OOPS Concepts, Features, diagrammatic representation, Packages.

Hot Java was the first Web browser that could download and play execute Java applets. Although Hot Java was the first browser to support Java applets, many browsers now support or will soon support applets. 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.

We can achieve method overloading in two ways. Method overloading increases the readability of the program. Method overloading is performed to figure out the program quickly. In Java, method overloading is not possible by changing the return type of the program due to avoid the ambiguity.

No, We cannot overload the methods by just applying the static keyword to them number of parameters and types are the same. By Type promotion is method overloading, we mean that one data type can be promoted to another implicitly if no exact matching is found. As displayed in the above diagram, the byte can be promoted to short, int, long, float or double.

The short datatype can be promoted to int, long, float or double. The char datatype can be promoted to int, long, float or double and so on. There are two methods defined with the same name, i.

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The first method accepts the integer and long type whereas the second method accepts long and the integer type. We can not tell that which method will be called as there is no clear differentiation mentioned between integer literal and long literal.

This is the case of ambiguity. Therefore, the compiler will throw an error. If a subclass provides a specific implementation of a method that is already provided by its parent class, it is known as Method Overriding.

It is used for runtime polymorphism and to implement the interface methods. It is because the static method is the part of the class, and it is bound with class whereas instance method is bound with the object, and static gets memory in class area, and instance gets memory in a heap.

No, we cannot override the private methods because the scope of private methods is limited to the class and we cannot access them outside of the class. Yes, we can change the scope of the overridden method in the subclass.

However, we must notice that we cannot decrease the accessibility of the method. The following point must be taken care of while changing the accessibility of the method. Yes, we can modify the throws clause of the superclass method while overriding it in the subclass.

However, there are some rules which are to be followed while overriding in case of exception handling. The method is overloaded in class Base whereas it is derived in class Derived with the double type as the parameter. In the method call, the integer is passed. Yes, all functions in Java are virtual by default.

Now, since java5, it is possible to override any method by changing the return type if the return type of the subclass overriding method is subclass type. It is known as covariant return type. The covariant return type specifies that the return type may vary in the same direction as the subclass.

Output Derived method called The method of Base class, i. In Test class, the reference variable b of type Base class refers to the instance of the Derived class. Here, Runtime polymorphism is achieved between class Base and Derived. At compile time, the presence of method baseMethod checked in Base class, If it presence then the program compiled otherwise the compiler error will be shown.

In this case, baseMethod is present in Base class; therefore, it is compiled successfully. However, at runtime, It checks whether the baseMethod has been overridden by Derived class, if so then the Derived class method is called otherwise Base class method is called.

In this case, the Derived class overrides the baseMethod; therefore, the Derived class method is called. In Java, the final variable is used to restrict the user from updating it. If we initialize the final variable, we can't change its value. In other words, we can say that the final variable once assigned to a value, can never be changed after that. The final variable which is not assigned to any value can only be assigned through the class constructor.

If we change any method to a final method, we can't override it. A final variable, not initialized at the time of declaration, is known as the final blank variable. We can't initialize the final blank variable directly. Instead, we have to initialize it by using the class constructor.

Java Questions

It is useful in the case when the user has some data which must not be changed by others, for example, PAN Number. Consider the following example:. Yes, if it is not static, we can initialize it in the constructor. If it is static blank final variable, it can be initialized only in the static block.

Output 20 Explanation. Since i is the blank final variable. It can be initialized only once. We have initialized it to Therefore, 20 will be printed. Explanation The getDetails method is final; therefore it can not be overridden in the subclass.

The constructor can never be declared as final because it is never inherited. Constructors are not ordinary methods; therefore, there is no sense to declare constructors as final.

However, if you try to do so, The compiler will throw an error. No, we cannot declare an interface as final because the interface must be implemented by some class to provide its definition. Therefore, there is no sense to make an interface final. However, if you try to do so, the compiler will show an error.

The main difference between the final method and abstract method is that the abstract method cannot be final as we need to override them in the subclass to give its definition. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Download Android App All Interview. I am good!! TestMethod ; System. Person class constructor called Employee class constructor called. Method Overloading Interview Questions. Compile Time Error: Method Overriding Interview Questions.

Next Topic Java interview Questions part 2. Javatpoint Services JavaTpoint offers too many high quality services. Java is mainly used for application programming. It is widely used in window, web-based, enterprise and mobile applications.

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It was an extension of C programming language. Java was designed and created as an interpreter for printing systems but later extended as a support network computing.

It was designed with a goal of being easy to use and accessible to a broader audience. Java doesn't support multiple inheritance through class. It can be achieved by interfaces in java.

Java supports pointer internally. However, you can't write the pointer program in java. 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?

Java Interview Questions and Answers PDF eBook Free Download (+ Questions, 60 Pages)

Answer- It is also known as Enhanced for loop. It is implemented without using no other keyword. The journal structure of for each loop is syntax: Question Explain the concept of Exception handling in Java? Answer- An exception is an abnormal condition that arises in a code sequence at run-time. In this, the exception can also be handled by user by using following five keywords: Try, Catch, Finally, Throw, Throws.

Please write some questions and queries about this most used programming language in the comments below this article.

Sample Paper for Java Programming Language. Procedural Programming Concepts.

Top Java Interview Questions with Answers

This post contains important and valuable questions of java for an interview. These questions help to crack interview round in placements and other examination.It is empty, but not null. In Java, access specifiers are the keywords which are used to define the access scope of the method, class, or a variable.

The Packages in this general purpose language have following features: Thank you very much for posting. The following figure explains loading and start-up of an applet.