NIO(NonblockingIO)

Non-blocking I/O (Java)

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Non-blocking I/O (usually called NIO, and sometimes called "New I/O") is a collection of Java programming language APIs that offer features for intensive I/O operations. It was introduced with the J2SE 1.4 release of Java by Sun Microsystems to complement an existing standard I/O. NIO was developed under the Java Community Process as JSR 51.^[1] An extension to NIO that offers a new file system API, called NIO.2, was released with Java SE 7 ("Dolphin").^[2]

 // Getting file channels
 FileChannel in = new FileInputStream(source).getChannel();
 FileChannel out = new FileOutputStream(target).getChannel();
 
 // JavaVM does its best to do this as native I/O operations.
 in.transferTo(0, in.size(), out);
 
 // Closing file channels will close corresponding stream objects as well.
 out.close();
 in.close();