Core java

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. […]

In this post, we will see how to remove non ascii character from a string in java. Sometimes, you get non-ascii characters in String and you need to remove them. We will use regular expressions to do it. Java program to remove non-ascii characters: [crayon-6a2df2a9ce2ac154501620/] When you run above program, you will get below output: […]

In this post, we will see how to convert HashMap to ArrayList in java. Many times, you need to store keys or values into ArrayList or Store HashMap’s Node objects in ArrayList. HashMap and ArrayList both are the most used data structure in java and both have different Hierarchy. Here are the ways to convert […]

Learn about how to check if String has all unique characters in java

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