In your Java program you may have a requirement to convert a char to String or to convert a String to char. This post shows different options to do these conversions. Convert char to String in Java For converting char to String in Java there is a toString() method in…
In this post we’ll learn about CompletableFuture class in Java along with examples to understand the functionalities this class provides. CompletableFuture in Java CompletableFuture is used for asynchronous computation of the task where the task is executed by a separate thread and the result is returned when it is ready.…
In Java method overriding is said to be covariant with respect to return type which means that the return type is allowed to vary in the same direction as the subclass. Covariant return type feature in Java was added in Java 5. What is covariant return type in Java First…
This post shows what does “Cannot make a static reference to the non-static method or a non-static field” error means and how to fix that error. static reference to the non-static method or field In order to understand why this error “Cannot make a static reference to the non-static method…
Java programming language provides two ways to implement a class whose instances are to be executed by a thread. By implementing Runnable interface By implementing Callable interface Since there are two options so they must have some difference in the features they offer, that’s what we’ll discuss in this post;…
With Java static import feature, which was added in Java 5, you can access static members (fields and methods defined as public static) of a class without qualifying them with class name. How to use static import in Java Generally if you need to access any static member (static field…
Static block in Java is used to initialize the static variables (also known as class variables). To initialize instance variables there are constructors, where error handling or other logic can be used. To provide the same capability for class variables, there are static initialization blocks in Java. Syntax of Java…
When a class member is defined using static keyword in Java it is associated with the class rather than with the instances of the class. That gives rise to a question can we overload or override static method in Java. This post tries to answer this question. Before that let’s…
ScheduledThreadPoolExecutor in Java adds functionality to schedule commands to run after a given delay, or to execute periodically. Since ScheduledThreadPoolExecutor is an ExecutorService so it uses thread from a thread pool to execute tasks. Java ScheduledThreadPoolExecutor ScheduledThreadPoolExecutor class is part of Java Executor framework with in the Java concurrent API.…
ThreadPoolExecutor in Java is used to execute each submitted task using one of possibly several pooled threads. When an instance of ThreadPoolExecutor is created a thread pool is also created and one of the thread from this pool of threads is used to execute tasks. Java ThreadPoolExecutor ThreadPoolExecutor class is…