날짜 비교

compareTo를 통한 날짜 비교

 

 

▷ Example

 

public void testDateCompare() {
	// 테스트 데이터 생성
	String strTestDate1 = "20210504153300";
	String strTestDate2 = "20210505153300";
	String strTestDate3 = "20210505153300";

	try {
		// 형 변환
		SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
		Date testDate1 = format.parse(strTestDate1);
		Date testDate2 = format.parse(strTestDate2);
		Date testDate3 = format.parse(strTestDate3);
		
		// 변환된 값 확인
		System.out.println("testDate1 : " + testDate1);
		System.out.println("testDate2 : " + testDate2);
		System.out.println("testDate3 : " + testDate3);
		
		/* 날짜 비교 */
		int compare1 = testDate1.compareTo(testDate2); // -1
		System.out.println("testDate1 > testDate2 : " + compare1);

		int compare2 = testDate2.compareTo(testDate1); // 1
		System.out.println("testDate2 > testDate1 : " + compare2);

		int compare3 = testDate2.compareTo(testDate3); // 0
		System.out.println("testDate2 == testDate3 : " + compare3);
		
	} catch (ParseException e) {
		System.out.println("Error : " + e);
	}
}
/*
	결과 : 
	testDate1 : Tue May 04 15:33:00 KST 2021
	testDate2 : Wed May 05 15:33:00 KST 2021
	testDate3 : Wed May 05 15:33:00 KST 2021
	testDate1 > testDate2 : -1
	testDate2 > testDate1 : 1
	testDate2 == testDate3 : 0
*/