Java8LocalTimeClient.java

package trial.yy.java8.client.time;

import java.time.DateTimeException;
import java.time.Duration;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

/**
 * java8 java.time.LocalTimeを試すためのサンプル
 * User: yy
 * Date: 13/04/19
 * Time: 22:30
 */
public class Java8LocalTimeClient {

    public static void main(String[] args) {

        // 現在時刻
        LocalTime time1 = LocalTime.now();
        System.out.println("time1 : " + time1);

        // 時・分を指定（23時59分）
        LocalTime time2 = LocalTime.of(23, 59);
        System.out.println("time2 : " + time2);

        // 時・分・秒を指定（0時1分2秒）
        LocalTime time3 = LocalTime.of(0, 1, 2);
        System.out.println("time3 : " + time3);

        // 時・分・秒・ナノ秒指定（23時59分59秒10ナノ秒）
        LocalTime time4 = LocalTime.of(23, 59, 59, 59);
        System.out.println("time4 : " + time4);

        // 12時30分20秒を生成
        LocalTime time5 = LocalTime.of(12, 30, 20);
        System.out.println("time5 : ");
        // 時・分・秒・ナノ秒を個別に取り出す
        System.out.println(" 時：" + time5.getHour());
        System.out.println(" 分：" + time5.getMinute());
        System.out.println(" 秒：" + time5.getSecond());
        System.out.println(" ナノ秒：" + time5.getNano());

        // 秒・分・時間を加減算してみる
        LocalTime time6 = LocalTime.of(12, 30, 20);
        System.out.println(time6 + "の10秒後: " + time6.plusSeconds(10));
        System.out.println(time6 + "の30分後: " + time6.plusMinutes(30));
        System.out.println(time6 + "の1時間後: " + time6.plusHours(1));
        System.out.println(time6 + "の30秒前: " + time5.minusSeconds(30));
        System.out.println(time6 + "の3分前: " + time5.minusMinutes(3));
        System.out.println(time6 + "の13時間前: " + time5.minusHours(13));

        LocalTime time7 = LocalTime.of(11, 22, 33);
        // 7分間を加算・減算してみる
        System.out.println(time7 + "の7分後: " + time7.plus(Duration.ofMinutes(7)));
        System.out.println(time7 + "の7分前: " + time7.minus(Duration.ofMinutes(7)));

        // 時刻文字列からparseしてみる
        LocalTime time8 = LocalTime.parse("12:34:56", DateTimeFormatter.ofPattern("HH:mm:ss"));
        System.out.println("time8 : " + time8);

        System.out.println("###");

        // 存在しない23時61分0秒とか指定するとDateTimeExceptionがスローされる
        try {
            LocalTime.of(23, 61, 0);
        } catch (DateTimeException e) {
            e.printStackTrace();
        }
    }
}