Core Java interview

In this post, we will see how to program FizzBuzz in java. Fizzbuzz is a fun game played generally by school children. It is simple game in which when your turn comes, you need to say the next number. So here are rules of the game: If number is divisible by 3, then you need […]

In this post, we will see how to print the following pyramid pattern. Problem Input : n = 4 Output : 1 3*2 4*5*6 10*9*8*7Input : n = 5 Output : 1 3*2 4*5*6 10*9*8*7 11*12*13*14*15 Solution If you notice the pattern we need to print odd rows in increasing order and even rows in […]

In this post, we will see about the difference between equals and == in java. This is most asked java interview question for fresher or 2-year experienced java developer and it might be confusing sometimes. Let’s try to understand each quickly. Equality operator “==” Equality operator can be used to compare primitives but when you […]

In this tutorial, we will see  about Collections in java. Collection framework is core part of java programming language. It is used in almost all the applications. Collections framework provides a way to store and retrieve the collection of elements. This framework has many interfaces and classes which makes programmer life easy. Let’s go through […]

In this post, we will see about Java 8 tutorial. I have written a lot of tutorials on Java 8. This is index post for all Java 8 posts. Java 8 has lots of new features which will change the way you do programming. Here is a list of features you need to know to […]

In this tutorial, we will see a simple java program to count number of words in sentence. [crayon-61a2bd73cbeda761641786/] Output: Enter a Sentence : Java2Blog is a technical blog. Total number of words are 5 That’s all about Java program to count number of words in sentence.

In this tutorial, we will see java program to print diamond pattern. [crayon-61a2bd73cdb85233757063/] That’s all about printing diamond pattern in java.

In this tutorial, we will learn about Interface Segregation Principle.It is one of the SOLID principles. In simple term, Interface Segregation Principle dictates that client should not be forced to implement the methods which it won’t be able to use.You can always throw UnsupportedOperationException from the method which you don’t want to use but it […]

In this tutorial, we will learn about Open Closed Design Principle in Java.Open closed principle is one of the SOLID principles. Open Closed Design Principle dictates that “software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification”. This definition was provided by Bertrand Meyer. Once we have written the class and […]