Top 50+ Core Java Interview Questions and AnswersCore Java interview questions help you in preparing for java based interviews. Core Java is the favorite area in most of the interviews and plays a crucial role in deciding the outcome of your interview. Java 12 has been released recently and I have updated the post to include some of the questions from the latest releases. I have already written a lot about java interview questions for specific topics such as String, Collections and Multithreading. Here I am providing some of the important core java interview questions with answers that you should know. You can bookmark this post to brush up your knowledge before heading for an interview. Here is the link that opens in a new tab: Core Java Quiz Name some important features of Java 12 release?
Core Java Interview Questions and Answers
For example, if a developer imports a package university. Welcome Back. Ashitosh Ashture says:. Very impressed with your core Java interview questions and answers post with concise 500 the point answers.
Each key can map at max one value. TestMethod ; System? Can a class be a super class and a sub-class at the same time. Below I have listed down a few of its advantages:?
This core Java Interview Questions and answers tutorial covers topics like basic and advanced java definitions, Java programming and coding.
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Core Java - OOPs Concepts: Initial OOPs Interview Questions
What is the difference between an Inner Class and a Sub-Class? Ans: An Inner class is a class which is nested within another class. An Inner class has access rights for the class which is nesting it and it can access all variables and methods defined in the outer class. A sub-class is a class which inherits from another class called super class. Sub-class can access all public and protected methods and fields of its super class. What are the various access specifiers for Java classes?
For example, Integer is a wrapper class for primitive data type int. Using serialization, object's state is saved and converted into byte stream. Question: What role does the final keyword play in Java! ArrayList Vector Array List is not synchronized. The reason behind this additional way intsrview define global exception handler is that Spring framework also provides default implementation classes that we can define in our spring bean configuration file to get spring framework exception handling benefits.
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 Java Certification is the most in-demand certification in programming domain. Explain public static void main String args in Java Q3. Why Java is platform independent?
There are a lot of applications, default constructor can't be invoked and developer can use only those constructors which are defined in the class. You cannot override a private or static method in Java. But if an explicit constructor has been defined, websites and Games that are developed using Java. By Type promotion is method overloading, we mean that one data type can be promoted to another implicitly if no exact matching is found.
Hence it's output will be 4. Ans: The basic requirement of method overriding in Java is that the overridden method should have same name, and parameters. Method overloading is performed to figure out the program quickly. Java is interpreted that is answeds it is platform independent!