garbage collector, 싱글톤

garbage collector

싱글톤

• 패턴 객체를 메모리에 단 한개 입력 가능

class  President{
    static President instance = new President();
    private President(){
    }
}
public class SingleTonEx01 {
    public static void main(String[] args) {
        President p1 = President.instance;
        System.out.println(p1.hashCode());

        President p2 = President.instance;
        System.out.println(p2.hashCode());
    }
}