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Java Interview QuestionsIn this Java Interview Questions blog, I am going to list some of the most important Java Interview Questions and Answers which will set you apart in the interview process. Java is used by approx 10 Million developers worldwide to develop applications for 15 Billion devices supporting Java. It is also used to create applications for trending technologies like Big Data to household devices like Mobiles and DTH boxes. And hence today, Java is used everywhere! This is the reason why is the most in-demand certification in programming domain. As a Java professional, it is essential to know the right buzzwords, learn the right technologies and prepare the right answers to commonly asked Java Interview Questions. Here’s a definitive list of top Java Interview Questions that will guarantee a breeze-through to the next level.In case you attended any Java interview recently, or have additional questions beyond what we covered, we encourage you to post them in our. Our expert team will get back to you at the earliest.So let’s get started with the first set of basic Java Interview Questions.Basic Java Interview Questions Q1. Explain JDK, JRE and JVM?
JDK vs JRE vs JVM JDKJREJVMIt stands for Java Development Kit.It stands for Java Runtime Environment.It stands for Java Virtual Machine.It is the tool necessary to compile, document and package Java programs.JRE refers to a runtime environment in which Java bytecode can be executed.It is an abstract machine. It is a specification that provides a run-time environment in which Java bytecode can be executed.It contains JRE + development tools.It’s an implementation of the JVM which physically exists.JVM follows three notations: Specification, Implementation, and Runtime Instance.Q2. Explain public static void main(String args) in Java.main in Java is the entry point for any Java program. It is always written as public static void main(String args). public: Public is an access modifier, which is used to specify who can access this method. Public means that this Method will be accessible by any Class.
static: It is a keyword in java which identifies it is class-based. Main is made static in Java so that it can be accessed without creating the instance of a Class. In case, main is not made static then the compiler will throw an error as main is called by the JVM before any objects are made and only static methods can be directly invoked via the class.
void: It is the return type of the method. Void defines the method which will not return any value. main: It is the name of the method which is searched by JVM as a starting point for an application with a particular signature only. It is the method where the main execution occurs. String args: It is the parameter passed to the main method.
Why Java is platform independent?Java is called platform independent because of its byte codes which can run on any system irrespective of its underlying operating system.Q4. Why Java is not 100% Object-oriented?Java is not 100% Object-oriented because it makes use of eight primitive data types such as boolean, byte, char, int, float, double, long, short which are not objects. What are wrapper classes in Java?Wrapper classes convert the Java primitives into the reference types (objects). Every primitive data type has a class dedicated to it.
These are known as wrapper classes because they “wrap” the primitive data type into an object of that class. Refer to the below image which displays different primitive type, wrapper class and constructor argument.Q6.
What are constructors in Java?In Java, constructor refers to a block of code which is used to initialize an object. It must have the same name as that of the class. Also, it has no return type and it is automatically called when an object is created.There are two types of constructors:. Default Constructor: In Java, a default constructor is the one which does not take any inputs. In other words, default constructors are the no argument constructors which will be created by default in case you no other constructor is defined by the user. Its main purpose is to initialize the instance variables with the default values. Also, it is majorly used for object creation.
Parameterized Constructor: The parameterized constructor in Java, is the constructor which is capable of initializing the instance variables with the provided values. In other words, the constructors which take the arguments are called parameterized constructors.Q7. What is singleton class in Java and how can we make a class singleton?Singleton class is a class whose only one instance can be created at any given time, in one JVM. A class can be made singleton by making its constructor private. What is the difference between Array list and vector in Java?
ArrayListVectorArray List is not synchronized.Vector is synchronized.Array List is fast as it’s non-synchronized.Vector is slow as it is thread safe.If an element is inserted into the Array List, it increases its Array size by 50%.Vector defaults to doubling size of its array.Array List does not define the increment size.Vector defines the increment size.Array List can only use Iterator for traversing an Array List.Vector can use both Enumeration and Iterator for traversing.Q9. What is the difference between equals and in Java?Equals method is defined in Object class in Java and used for checking equality of two objects defined by business logic.“” or equality operator in Java is a binary operator provided by Java programming language and used to compare primitives and objects. Public boolean equals(Object o) is the method provided by the Object class. The default implementation uses operator to compare two objects. For example: method can be overridden like String class.
Equals method is used to compare the values of two objects. What are the differences between Heap and Stack Memory in Java? What is Java String Pool?Java String pool refers to a collection of Strings which are stored in heap memory.
In this, whenever a new object is created, String pool first checks whether the object is already present in the pool or not. If it is present, then the same reference is returned to the variable else new object will be created in the String pool and the respective reference will be returned.Q26. Differentiate between static and non-static methods in Java. Static MethodNon-Static Method1.
The static keyword must be used before the method name1. No need to use the s tatic keyword before the method name2. It is called using the class (className.methodName)2. It is can be called like any general method3. They can’t access any non-static instance variables or methods3. It can access any static method and any static variable without creating an instance of the classQ27. What is constructor chaining in Java?In Java, constructor chaining is the process of calling one constructor from another with respect to the current object.
Constructor chaining is possible only through legacy where a subclass constructor is responsible for invoking the superclass’ constructor first. There could be any number of classes in the constructor chain. Constructor chaining can be achieved in two ways:. Within the same class using this. From base class using superQ28. Difference between String, StringBuilder, and StringBuffer. FactorStringStringBuilderStringBufferStorage AreaConstant String PoolHeap AreaHeap AreaMutabilityImmutableMutableMutableThread SafetyYesNoYesPerformanceFastMore efficientLess efficient.
GetPostLimited amount of data can be sent because data is sent in header.Large amount of data can be sent because data is sent in body.Not Secured because data is exposed in URL bar.Secured because data is not exposed in URL bar.Can be bookmarkedCannot be bookmarkedIdempotentNon-IdempotentIt is more efficient and used than PostIt is less efficient and usedQ3. What is Request Dispatcher?RequestDispatcher interface is used to forward the request to another resource that can be HTML, JSP or another servlet in same application. We can also use this to include the content of another resource to the response.There are two methods defined in this interface:1.void forward2.void include Q4. What are the differences between forward method and sendRedirect methods?
Forward methodSendRedirect methodforward sends the same request to another resource.sendRedirect method sends new request always because it uses the URL bar of the browser.forward method works at server side.sendRedirect method works at client side.forward method works within the server only.sendRedirect method works within and outside the server.Q5. What is the life-cycle of a servlet?There are 5 stages in the lifecycle of a servlet:. Servlet is loaded.
Servlet is instantiated. Servlet is initialized. Service the request. Servlet is destroyedQ6. What are the two ways to create a thread?In Java, threads can be created in the following two ways:-. By implementing the Runnable interface.
By extending the ThreadQ17. What are the different types of garbage collectors in Java?Garbage collection in Java a program which helps in implicit memory management. Since in Java, using the new keyword you can create objects dynamically, which once created will consume some memory.
Once the job is done and there are no more references left to the object, Java using garbage collection destroys the object and relieves the memory occupied by it. Java provides four types of garbage collectors. Serial Garbage Collector. Parallel Garbage Collector. CMS Garbage Collector. G1 Garbage CollectorIn case you are facing any challenges with these java interview questions, please comment your problems in the section below.
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