src/action/tt.java

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package action;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class tt 
{

	public static void main(String[] args) throws ParseException 
	{
		/*DateFormat df=new SimpleDateFormat("yyyy-MM-dd");
		Calendar c = Calendar.getInstance();
		c.add(Calendar.MONTH, 6); // 目前時間加1個月    
		System.out.println(df.format(c.getTime())); */   
		
		System.out.println(get_riqi("2018-05-31", 2));

	}
	
	public static String get_riqi(String riqi,int jigeue) throws ParseException
	{
		SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
		Date date =sdf.parse(riqi);
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(date);
		
		calendar.add(Calendar.MONTH, jigeue); // 目前時間加1個月    
		return  sdf.format(calendar.getTime());

	}

}