JAVA 160608 Singleton

package mypack;

import java.util.Calendar;

public class singletonMain {

public static void main(String[] args){

singleton s1 = new singleton();

singleton s2 = new singleton();

System.out.println(s1 + " " + s2);

System.out.println(s1.toString() + " " + s2.toString());

System.out.println("kor:" + s1.kor);

System.out.println();

singleton s3 = singleton.getInstance();

singleton s4 = singleton.getInstance();

System.out.println(s3 + " " + s4);

System.out.println(s3.toString() + " " + s4.toString());

System.out.println("kor:" + s3.kor);

s3.kor = 20;

System.out.println("kor:" + s3.kor); //같은 객체

System.out.println("kor:" + s4.kor); //같은 객체

System.out.println("kor:" + s1.kor); //다른 객체

System.out.println();

Calendar calendar = Calendar.getInstance();

int y = calendar.get(Calendar.YEAR);

System.out.println("년도는 " + y + "년");

Calendar calendar2 = Calendar.getInstance();

int m = calendar2.get(Calendar.MONTH) + 1;

System.out.println("월은 " + m + "월");

}

}

---

package mypack;

public class singleton {

int kor = 10;

//Singleton pattern

private static singleton Singleton = new singleton();

public static singleton getInstance(){

return Singleton;

}

}

---

mypack.singleton@15db9742 mypack.singleton@6d06d69c

mypack.singleton@15db9742 mypack.singleton@6d06d69c

kor:10

mypack.singleton@7852e922 mypack.singleton@7852e922

mypack.singleton@7852e922 mypack.singleton@7852e922

kor:10

kor:20

kor:20

kor:10

년도는 2016년

월은 6월