How to use JAVA interface to implement multiple implementation classes

This article mainly introduces how to use the JAVA interface to achieve multi-implementation classes, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Class NoteBook {/ / Notebook enables the running function public void run () {System.out.println ("Notebook running") } / / Notebook uses usb device. When the notebook object calls this function, it must pass a USB device public void useUSB (USB usb) that conforms to USB rules {/ / to determine whether there is a USB device if (usb! = null) {usb.open (); usb.close () }} public void shutDown () {System.out.println ("Notebook closed");}} public class Test {public static void main (String [] args) {/ / create notebook entity object NoteBook nb = new NoteBook (); / / Notebook opens nb.run (); / / create mouse entity object Mouse m = new Mouse () / / Notebook uses mouse nb.useUSB (m); / / creates keyboard entity object KeyBoard kb = new KeyBoard (); / / Notebook uses keyboard nb.useUSB (kb); / / Notebook closes nb.shutDown ();}} class KeyBoard implements USB {public void open () {System.out.println ("Keyboard on") } public void close () {System.out.println ("keyboard off");}} class Mouse implements USB {public void open () {System.out.println ("mouse on");} public void close () {System.out.println ("mouse off");}} interface USB {void open (); / / enable void close () / / close function} Thank you for reading this article carefully. I hope the article "how to use JAVA interface to implement multiple implementation classes" shared by the editor will be helpful to everyone. At the same time, I also hope that you will support and pay attention to the industry information channel. More related knowledge is waiting for you to learn!