Java Signleton mode and sample code _java

The singleton mode is the creation mode.

This pattern involves only one class that is responsible for creating its own object.

This class ensures that only one object gets created.

This class provides a way to access its unique object.

For example, when designing a user interface, we can only have one main application window. We can use the singleton mode to ensure that there is an instance of the Mainapplicationwindow object.

The following code creates a main window class.

The MainWindow class has its own private constructs and has its own static instance.

The main window class provides a static method to obtain the world outside of its static instance.

Our demo class will use the main window class to get a main window object.

Class MainWindow {
  //create an object of MainWindow
  private static MainWindow instance = new MainWindow ();

  Make the constructor private so this class cannot is//instantiated by other
  class
  private MainWindow () {}
   //get the only object available public
  static MainWindow getinstance () {return
   instance;
  }

  public void ShowMessage () {
   System.out.println ("Hello world!");
  }

public class Main {public
  static void Main (string[] args) {//get the ' only
   object available
   MainWindow obj ECT = Mainwindow.getinstance ();

   Show the message
   object.showmessage ();
  }

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