Interview

In this post, we will see how to create custom exception in java. It is very simple to create custom exception in java. You just need to extends Exception class to create custom exception. Lets understand this with example. You have list of counties and if You have “USA” in list of country, then you […]

In this post, we will see Spring interview interview questions. If you are java/j2ee developer and have some experienced on Spring, you are going to face Spring interview questions. If you are looking for below queries then this post will help you as well. Spring interview questions for 3 years experience Spring interview questions for […]

In this post, we will see interview questions on java String. String is most important data type which we use in our programs very often. 1. Why String is declared final or immutable in java? There are various reasons to make String immutable. String pool Thread Safe Security Class Loading Cache hash value You can […]

In this post, we will see how to find all permutations of String in java. We will use a very simple approach to do it. Take out first character of String and insert into different places of permutations of remaining String recursively. Lets say you have String as ABC. So we take out A from […]

Core java interview questions play a vital role in java/j2EE interviews. Whether you are fresher or experienced, you are going to face core java interview questions. You can also go through top java interview programs for practicing java programs. Here I am providing some important core java interview questions with answers. 1. What do you […]

In this post, we will see difference between checked and unchecked exception in java. It is important question regarding exceptional handling. What is Exception? Exception is unwanted situation or condition while execution of the program. If you do not handle exception correctly, it may cause program to terminate abnormally. What is checked exception? Checked exceptions […]

In this post, we will see difference between StringBuffer and StringBuilder in java StringBuffer vs StringBuilder Parameter StringBuffer StringBuilder Thread-safe StringBuffer is thread safe. Two threads can not call methods of StringBuffer simultaneously. StringBuilder is not thread safe, so two threads can call methods of StringBuilder simultaneously. Performance It is less performance efficient as it […]

We have already seen SOAP web services and RESTful web services in detail before. In this post, we are going to see differences between SOAP and REST web services. SOAP vs REST web services Parameter SOAP REST Acronym SOAP stands for simple object access protocol REST stands for REpresentational State Transfer Protocol vs Architectural style […]

Web services interview questions are most asked questions if you are applying for software developer role. In this post, we will see multiple web services interview questions. 1. What are web services? Web services are ways of communication between two application over network. It allows you to expose business logic using API. For example: Lets […]