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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. So, job seekers go through the Advanced Java Interview Questions PDF and start their preparation according to it. “Advanced Java” is nothing. In this Java Interview Questions blog, I am going to list some of the most So let's get started with the first set of basic Java Interview Questions. a head start into Java programming and train you for both core and advanced Java concepts.
Encapsulation is a mechanism where you bind your data variables and code methods together as a single unit. Here, the data is hidden from the outer world and can be accessed only via current class methods. This helps in protecting the data from any unnecessary modification.
We can achieve encapsulation in Java by: Declaring the variables of a class as private. Providing public setter and getter methods to modify and view the values of the variables. What is an association? Association is a relationship where all object have their own lifecycle and there is no owner.
Multiple students can associate with a single teacher and a single student can associate with multiple teachers but there is no ownership between the objects and both have their own lifecycle.
Advanced Java Interview Questions for Freshers and Experienced
These relationships can be one to one, one to many, many to one and many to many. What do you mean by aggregation?
An aggregation is a specialized form of Association where all object has their own lifecycle but there is ownership and child object can not belong to another parent object. A single teacher can not belong to multiple departments, but if we delete the department teacher object will not destroy. What is composition in Java?
It is a strong type of Aggregation.
Child object does not have their lifecycle and if parent object deletes all child object will also be deleted. House can contain multiple rooms there is no independent life of room and any room can not belongs to two different houses if we delete the house room will automatically delete.
What is a marker interface? A Marker interface can be defined as the interface having no data member and member functions. In simpler terms, an empty interface is called the Marker interface. The most common examples of Marker interface in Java are Serializable, Cloneable etc. The marker interface can be declared as follows. What is object cloning in Java? Object cloning in Java is the process of creating an exact copy of an object. It basically means the ability to create an object with a similar state as the original object.
This method creates a new instance of the class of the current object and then initializes all its fields with the exact same contents of corresponding fields. Answer: A native method is a method that is applied in a language other than Java. What value does read Line return when it has reached the end of a file? Answer: The readLine method returns null, 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? Answer: Yes, a for statement can loop indefinitely. For example, consider the following:for ;;.
Explain Java Coding standards for Methods? Answer: 1 Method names should start with small letters. Explain Java Coding Standards for Constants? Answer: Constants in java are created using static and final keywords.
What is synchronization and why is it important? Answer: The term synchronization is the ability to control the access of multiple threads to shared resources. This often leads to major errors. Explain Java Coding Standards for variables? Answer: 1 Variable names should start with small letters. Ex : string,value,empName,empSalary Name three Component subclasses that support painting? Why Java is not pure Object Oriented language?
Answer: Java support primitive types such as int, byte, short, long etc that why it is not said to be pure object oriented language. What are access modifiers? Answer: Java provides three access controlssuch as public, private and protected access modifier. Vector defines the increment size. Array List can only use Iterator for traversing an Array List. Except Hashtable, Vector is the only other class which uses both Enumeration and Iterator. Features Stack Heap Memory Stack memory is used only by one thread of execution.
Heap memory is used by all the parts of the application. Objects stored in the heap are globally accessible. Memory management is based on generation associated to each object.
Lifetime Exists until the end of execution of the thread.
100+ Java Interview Questions You Must Prepare In 2019
Heap memory lives from the start till the end of application execution. Usage Stack memory only contains local primitive and reference variables to objects in heap space.
In case you are facing any challenges with these java interview questions, please comment on your problems in the section below. An interface cannot provide any code at all,just the signature.
TOP Interview Questions Answers
In case of abstract class, a class may extend only one abstract class.Java automatic type conversion is done if the following conditions are met: Objects stored in the heap are globally accessible. What modifiers may be used with an inner class that is a member of an outer class? Which method of the Component class is used to set the position and size of a component?
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. The javawt.