[자바] 싱글톤 패턴(singleton)

싱글톤(singleton)

클래스를 통해 생성할 수 있는 객체가 한개만 되도록 만드는 것

class Singleton {
    private static Singleton one;
    private Singleton() {
    }
    public static Singleton getInstance() {
        if(one ==null) {
            one = new Singleton();
        }
        return one;
    }
}

public class Main {
    public static void main(String[] args) {
        Singleton singleton1 = Singleton.getInstance();
        Singleton singleton2 = Singleton.getInstance();
        System.out.println(singleton1 == singleton2);
    }
}