058-APIの利用-java7までの日付処理のサンプル　【新人エンジニアが最初に覚えたい100のJava文法】

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

public class ExampleDateOld {
	public static void main(String[] args) {
		System.out.println(compareDate("2018/01/01"));
	}

	public static int compareDate(String date) {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.HOUR_OF_DAY, 0);
		cal.set(Calendar.MINUTE, 0);
		cal.set(Calendar.SECOND, 0);
		cal.set(Calendar.MILLISECOND, 0);
		Date currentDate = cal.getTime();
		DateFormat format = new SimpleDateFormat("yyyy/MM/dd");
		format.setLenient(false);
		try {
			Date checkDate = format.parse(date);
			return currentDate.compareTo(checkDate);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return -9999;
	}
}