Advanced Java Interview Questions and answers

Q.1   What is the purpose of garbage collection in Java, and when is it used? Ans:   The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unreachable to the program in which it is used. Q.2    Describe synchronization in respect to multithreading. Ans:   With respect to multithreading,...

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Core Java Interview Questions

Q.1 What is the Java API? Ans:   The Java API is a large collection of ready-made software components that provide many useful capabilities, such as graphical user interface (GUI) widgets. Q.2   Describe the principles of OOPS? Ans:  There are three main principals of oops which are called Polymorphism, Inheritance and Encapsulation. Q.3   Explain the Inheritance principle? Ans:  Inheritance is the process by which one object acquires...

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J2EE Interview Questions and answers

Q.1   What is J2EE? Ans:  J2EE is an environment for developing and deploying enterprise applications. The J2EE platform consists of a set of services, application programming interfaces (APIs), and protocols that provide the functionality for developing multitier, web-based applications. Q.2   What is the J2EE module? Ans:  A J2EE module consists of one or more J2EE components for the same container type and one component deployment descriptor of that...

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Prime Number Program in Java

Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17.... are the prime numbers. Note: 0 and 1 are not prime numbers. 2 is the only even prime number because all the numbers can be divided by 2. Let's see the prime number program in java. In this java program, we will take a number variable and check whether the number is...

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Palindrome Program in Java

Palindrome number in java: A palindrome number is a number that is same after reverse. For example 545, 151, 34543, 343, 171, 48984 are the palindrome numbers. Palindrome number algorithm Get the number to check for palindrome Hold the number in temporary variable Reverse the number Compare the temporary number with reversed number If both numbers are same, print "palindrome number" Else print "not palindrome number" Let's see the palindrome...

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Fibonacci series in Java

In fibonacci series, next number is the sum of previous two numbers for example 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 etc. The first two numbers of fibonacci series are 0 and 1. There are two ways to write the fibonacci series program in java: Fibonacci Series without using recursion Fibonacci Series using recursion Fibonacci Series in Java without using recursion Let's see the fibonacci series program in java without using recursion. class FibonacciExample1 {   public static void main(String args[])   {      int n1=0,n2=1,n3,i,count=10;      System.out.print(n1+" "+n2);  ...

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Factorial Program in Java

Factorial Program in Java: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:                                1.    4! = 4*3*2*1 = 24                                  2.    5! = 5*4*3*2*1 = 120   Here,...

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