[Java] 기준월부터 이전36개월 구하기

package test.java;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

public class Test {
	private static Logger logger = Logger.getLogger(Test.class);

	public static void main(String[] args) {

		String selectActivCd = "201307";
		String tmp1     = selectActivCd.toString();
		String tmp      = tmp1.replaceAll("[^\\d]","");
		String tmpMinYear  = tmp.substring(0, 4);
		String tmpMinMonth = tmp.substring(4, 6);
		
		ArrayList BeforeDfYmList = new ArrayList();
		
		for(int i=37; i>0; i--){
			String myIvalue = String.valueOf(i);
			
			if (Integer.parseInt(tmpMinMonth) <= 9){
				tmpMinMonth = "0" + String.valueOf(Integer.parseInt(tmpMinMonth) + 1);
			} else {
				tmpMinMonth = String.valueOf(Integer.parseInt(tmpMinMonth) + 1);
			}
			
			if (tmpMinMonth.equals("13")){
				tmpMinYear = String.valueOf(Integer.parseInt(tmpMinYear) +1);
				tmpMinMonth = "01";
			}
			
			BeforeDfYmList.add(tmpMinYear.toString() + tmpMinMonth.toString());
		}
		System.out.println(" BeforeDfYmList ==> " + BeforeDfYmList);
	}
}

결과값

BeforeDfYmList ==> [201308, 201309, 2013010, 201311, 201312, 201401, 201402, 201403, 201404, 201405, 201406, 201407, 201408, 201409, 2014010, 201411, 201412, 201501, 201502, 201503, 201504, 201505, 201506, 201507, 201508, 201509, 2015010, 201511, 201512, 201601, 201602, 201603, 201604, 201605, 201606, 201607, 201608]