CopyOnWriteArrayList concurrent collection in java (example)

CopyOnWriteArrayList is thread-safe variant of ArrayList. New copy of underlying array is created when any add, set (or modification) operations performed on CopyOnWriteArrayList. CopyOnWriteArrayList can be visualize as combination of words, COPY + On Write + ArrayList. New copy of underlying array is created, when any write/update/remove operation is performed on CopyOnWriteArrayList. i.e. When any… Read More »

Read contents from console or command line (Scanner/ Java/ Example)

Scanner class is a text parser, which is used to parse primitives & strings using regular expression. Scanner split the input into token using delimiter pattern. Default delimiter pattern is a whitespace. We will read the contents from console or command line using Scanner class. Scanner class extends object & implements Closeable & Iterable interface. 1.… Read More »

Java Scanner example – read & write contents to/ from file (example)

Scanner is text parser which used to parse primitives & strings using regular expression. Scanner split the input into token using delimiter pattern. Default pattern delimiter is whitespace. We will write content to a file using FileWriter class. Then, we will read content from as file using Scanner class. Scanner class extends object & implements… Read More »

Inter thread communication in java (Example/ PipedInputStream /PipedOutputStream)

Inter thread communication is very common phenomenon. There are many ways to achieve inter thread communication. In current post, we will use pipes to achieve thread communication. Java has set of classes named PipedOutputStream & PipedInputStream to communicate between threads. We will create couple of threaders namely producer & consumer. Producer thread will produce the… Read More »

Create new file & folder (directory) in java (with example)

Given a path in java, create a new folder/directory & file using File class. File class has following methods to create file & directory in java. We will create directory in non existed path using mkdirs api. Also, we will create new directory & file using mkdir & createNewFile respectively. Program: create new file &… Read More »

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