[SPRING] 싱글턴 만들기

package di04_02;
 
public class Singleton {
    private static Singleton instance;
    
    private Singleton(){}
    
    public static Singleton getInstance(){
        if(instance == null)
            instance = new Singleton();
        return instance;
    }
}
 

xml에 factory-method 사용해서 객체 생성

factory-method는 기본 생성자도 없고 다른 생성자도 없는 상황에서 객체를 생성해줌

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd">
 
 
 
<bean id="singleton" class="di04_02.Singleton" factory-method="getInstance"></bean>
 
</beans>