So, let’s dive deep into the plethora of useful interview questions on Java. The questions will revolve around the basic and core fundamentals of Java. Go through all the questions to enhance your chances of performing well in the interviews. The following article will cover all the popular Java interview questions for freshers as well as experienced candidates in depth. A number is said to be a magic number if after doing sum of digits in each step and inturn doing sum of digits of that sum, the ultimate result (when there is only one digit left) is 1.ĭo you have what it takes to ace a Java Interview? We are here to help you in consolidating your knowledge and concepts in Java.
Write a Java Program to check if any number is a magic number or not. Given an array of non-duplicating numbers from 1 to n where one number is missing, write an efficient java program to find that missing number. Write a Java Program to find the factorial of a given number. Write a Java program to check if the two strings are anagrams. Check if a given string is palindrome using recursion. What are the possible ways of making object eligible for garbage collection (GC) in Java?
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What is the output of the below code and why? Why is it said that the length() method of String class doesn't return accurate results? Explain the term “Double Brace Initialisation” in Java? What do you understand by marker interfaces in Java? Will the finally block be executed if the code System.exit(0) is written at the end of try block? Does importing of com.myMainPackage.* also import .*? In case a package has sub packages, will it suffice to import only the main package? e.g. Is it possible to import the same class or package twice in Java and what happens to it during runtime? What could be the tradeoff between the usage of an unordered array versus the usage of an ordered array? Can you explain the Java thread lifecycle? In the given code below, what is the significance of. Why is synchronization necessary? Explain with the help of a relevant example. Is exceeding the memory limit possible in a program despite having a garbage collector? How is the creation of a String using new() different from that of a literal? Although inheritance is a popular OOPs concept, it is less advantageous than composition. Contiguous memory locations are usually used for storing actual values in an array but not in ArrayList. Can you call a constructor of a class inside the another constructor? Will the finally block get executed when the return statement is written at the end of try block and catch block as shown below? Is it mandatory for a catch block to be followed after a try block? How does an exception propagate in the code? What do you understand by Object Cloning and how do you achieve it in Java? What happens if there are multiple main methods inside one class in Java? What happens if the static modifier is not included in the main method signature in Java?
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How to not allow serialization of attributes of a class in Java? Which among String or String Buffer should be preferred when there are lot of updates required to be done in the data? Java works as “pass by value” or “pass by reference” phenomenon? What are the differences between constructor and method of a class in Java? What are the different ways of threads usage? What is the importance of reflection in Java? What are the differences between HashMap and HashTable in Java? What are the differences between JVM, JRE and JDK in Java?
Why is the character array preferred over string for storing confidential information? What makes a HashSet different from a TreeSet? In Java, static as well as private method overriding is possible. Using relevant properties highlight the differences between interfaces and abstract classes. How would you differentiate between a String, StringBuffer, and a StringBuilder? Apart from the security aspect, what are the reasons behind making strings immutable in Java? What part of memory - Stack or Heap - is cleaned in garbage collection process? What is the main objective of garbage collection? Do final, finally and finalize keywords have the same function? Explain the use of final keyword in variable, method and class. A single try block and multiple catch blocks can co-exist in a Java Program. Comment on method overloading and overriding by citing relevant examples. Briefly explain the concept of constructor overloading How is an infinite loop declared in Java? Can you tell the difference between equals() method and equality operator (=) in Java? What do you understand by an instance variable and a local variable? Why is Java not a pure object oriented language? Why is Java a platform independent language?
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