package info.istlab.dp.dp1;

import java.awt.Desktop;
import java.awt.DisplayMode;
import java.awt.GraphicsEnvironment;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Calendar;
import java.util.Date;

class Singleton {
    private static Singleton onlyone;
    public static Singleton getOnlyOne() {
        if (onlyone == null)
            onlyone = new Singleton();
        return onlyone;
    }
    Date created;
    private Singleton() {
        created = Calendar.getInstance().getTime();
    }
    public String toString() {
        return hashCode()+" "+created.toString();
    }
}

public class SingletonTest {
    public static void main(String[] args) {
        // Singleton single = new Singleton();
        Singleton single1 = Singleton.getOnlyOne();
        System.out.println(single1.toString());
        SingletonTest.wait(5);
        Singleton single2 = Singleton.getOnlyOne();
        System.out.println(single2.toString());

        // Other examples
        // Desktop.getDesktop()
        Desktop dp = Desktop.getDesktop();
        try {
            dp.browse(new URI("https://istlab.info/"));
        } catch (IOException | URISyntaxException e) {
            e.printStackTrace();
        }

        // GraphicsEnvironment
        GraphicsEnvironment genv = GraphicsEnvironment.getLocalGraphicsEnvironment();
        DisplayMode dm = genv.getDefaultScreenDevice().getDisplayMode();
        System.out.println("Main Display width:"+dm.getWidth()+" height:"+dm.getHeight());

        // Runtime rt = Runtime.getRuntime();
    }

    public static void wait(int sec) {
        try {
            Thread.sleep(sec * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}