(Singleton) Langkah Pembuatan : 1. Cookies.java 2. CookiesDemo.java

(Singleton) Cookies.java

public class Cookies {
    //atribut
    private static Cookies cookies;

    //method
    //konstruktor
    private Cookies(){
        System.out.println("Hai, saya cookies.");
    }

    //ini hook
    public static synchronized Cookies getCookies(){
        if(cookies==null){
            cookies=new Cookies();
        }

        return cookies;
    }

    public void lakukanSesuatu(){
        System.out.println("Cookies ini bundar.");
    }
}

CookiesDemo.java

public class CookiesDemo {

    public static void main(String[] args) {
	// write your code here
        Cookies cookies=Cookies.getCookies();
        //perintah ini akan mendapatkan objek yang sama
        Cookies cookies2=Cookies.getCookies();

        //dua perintah ini sama
        cookies.lakukanSesuatu();
        cookies2.lakukanSesuatu();

    }
}