Core java

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 […]

In this post, you will learn about the Connection Pool. This post is intended by java application development experts for entire development community to let people learn and acknowledge about Connection Pool and how to use its object using Service Locator design pattern. Introduction Connection pool is a mechanism which applicable for all technologies in […]

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 […]

In this post, we will see difference between CountDownLatch and CyclicBarrier in java. Lets first see similarities among them. Both wait for specific number of threads or tasks to finish. Lets see differences between CountDownLatch and CyclicBarrier. CountDownLatch vs CyclicBarrier Parameter CountDownLatch CyclicBarrier Reuse It can not be reused once count reaches 0 It can […]

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In Java, it’s possible to use a try block without a catch block, but it must be followed either by a finally block or be part of a try-with-resources statement. Let’s see both cases with the help of examples: 1. try-finally Structure You can use a try block with a finally block. As you may […]

Daemon threads are low priority background threads which provide services to user threads. It’s life depends on user threads. If no user thread is running then JVM can exit even if daemon threads are running. JVM do not wait for daemon threads to finish. Daemon threads perform background tasks such as garbage collection, finalizer  etc. […]