Core java

1. Introduction Java’s Executors.newCachedThreadPool() factory method provides a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available. Our goal is to understand how to use this thread pool to execute asynchronous tasks efficiently. 2. What is newCachedThreadPool? The newCachedThreadPool method from the java.util.concurrent.Executors class is a […]

Java 5 has introduced new concurrent API called Executor frameworks to make programmer life easy. It simplifies design and development of multi-thread applications. It consists of mainly Executor, ExecutorService interface and ThreadPoolExecutor class which implements both interfaces i.e. Executor and ExecutorService. ThreadPoolExecutor class provide the implementation of thread pool. We will understand more about it […]

In this tutorial, we are going to see about Semaphore in java. Semaphore is a class in java.util.concurrent package introduced in JDK 5. Semaphore basically maintains a set of permits, so there are two methods which are mainly used for semaphore. acquire release acquire() method is used to get a permit and if no. of […]

In this post, I am going to share java interview questions which are generally asked on immutable class. Immutable class is important topic as it deals with creation of thread safe class. Here I am providing some important immutable class interview questions with answers. 1. What is immutable class? Answer : Immutable objects are those […]

In this tutorial, we are going to see how to create immutable class in java. Immutable class is class whose state can not be changed once created. Example: String is best example for immutable class. Once you create a String, you can not change it. Immutable class is very simple to understand, it has only […]

In this tutorial, we are going to see Retrofit Android tutorial to get data from server. In previous post, we have seen android JSON parsing tutorial which was very simple. If you are not aware about Retrofit, it is android http library used to handle HTTP request.You can treat it as a replacement of AsyncTask in previous […]

In this tutorial, we are going to see Android JSON parsing tutorial using Volley. In previous post, we have seen android JSON parsing tutorial which was very simple. In this tutorial, we are going to use external library Volley for sending HTTP request. You can treat it as a replacement of AsyncTask in previous tutorial. […]

In this tutorial, we are going to integrate android with restful web services which return json as response. So we are going to get json from restful web services and then render json response to android custom listview. Example : I have already implemented restful webservices json example. I am going to use same example […]

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. In this post, we will see how to find smallest and largest element in an array. 1. Introduction to Problem Let’s say we have an array of numbers. [crayon-66471742035ce096869352/] Our goal is to find out smallest and […]