Table of Contents

Initialize OffsetTime in Java

初始化 OffsetTime 具有偏移量的時間的不可變物件，可以同時在不同的執行緒下被使用，介紹常見的 of 、 parse 、 from 等方法，了解 Initialize OffsetTime Java 的不同操作和方法，本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- src
       +- test
       |   +- org
       |       +- ruoxue
       |           +- java_147
       |               +- datetime
       |                   +- offsettime
       |                       +- InitializeOffsetTimeTest.java

單元測試

Java Initialize OffsetTime 提供初始化操作 OffsetTime 。

now

建立一個 OffsetTime ，提供目前時間。

	@Test
	public void now() {
		OffsetTime offsetTime = OffsetTime.now();
		System.out.println(offsetTime);

		ZoneId zone = ZoneId.of("Brazil/Acre");
		offsetTime = OffsetTime.now(zone);
		System.out.println(offsetTime);

		zone = ZoneId.of("UTC-5");
		Clock clock = Clock.system(zone);
		offsetTime = OffsetTime.now(clock);
		System.out.println(offsetTime);

		zone = ZoneId.of("Etc/GMT+5");
		offsetTime = OffsetTime.now(zone);
		System.out.println(offsetTime);
	}

19:32:59.368+08:00
06:32:59.368-05:00
06:32:59.368-05:00
06:32:59.368-05:00

of

建立一個 OffsetTime ，建立指定時間。

	@Test
	public void of() {
		ZoneOffset offset = ZoneOffset.ofHours(-5);
		OffsetTime offsetTime = OffsetTime.of(6, 1, 4, 0, offset);
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());

		offsetTime = OffsetTime.of(LocalTime.of(6, 1, 4, 0), offset);
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());
	}

06:01:04-05:00
06:01:04-05:00

parse

Java Initialize OffsetTime 建立一個 OffsetTime ，建立指定時間。

	@Test
	public void parse() {
		OffsetTime offsetTime = OffsetTime.parse("06:01:04-05:00");
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());

		offsetTime = OffsetTime.parse("06:01:04.123456789-05:00");
		System.out.println(offsetTime);
		assertEquals("06:01:04.123456789-05:00", offsetTime.toString());
	}

06:01:04-05:00
06:01:04.123456789-05:00

from

OffsetTime Initialization Java 建立一個 OffsetTime ，從另一個時間，建立指定時間。

	@Test
	public void from() {
		OffsetTime offsetTime = OffsetTime.parse("06:01:04.123456789-05:00");
		OffsetTime result = OffsetTime.from(offsetTime);
		System.out.println(result);
		assertEquals("06:01:04.123456789-05:00", result.toString());

		ZonedDateTime zonedDateTime = ZonedDateTime.parse("2023-11-11T06:01:04-05:00[Brazil/Acre]");
		result = OffsetTime.from(zonedDateTime);
		System.out.println(result);
		assertEquals("06:01:04-05:00", result.toString());
	}

06:01:04.123456789-05:00
06:01:04-05:00

InitializeOffsetTimeTest.java

OffsetTime Initialization Java 新增單元測試，驗證 Java OffsetTime Initialize 是否符合預期。

package org.ruoxue.java_147.datetime.offsettime;

import static org.junit.Assert.*;

import java.time.Clock;
import java.time.LocalTime;
import java.time.OffsetTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

import org.junit.Test;

public class InitializeOffsetTimeTest {

	@Test
	public void now() {
		OffsetTime offsetTime = OffsetTime.now();
		System.out.println(offsetTime);

		ZoneId zone = ZoneId.of("Brazil/Acre");
		offsetTime = OffsetTime.now(zone);
		System.out.println(offsetTime);

		zone = ZoneId.of("UTC-5");
		Clock clock = Clock.system(zone);
		offsetTime = OffsetTime.now(clock);
		System.out.println(offsetTime);

		zone = ZoneId.of("Etc/GMT+5");
		offsetTime = OffsetTime.now(zone);
		System.out.println(offsetTime);
	}

	@Test
	public void of() {
		ZoneOffset offset = ZoneOffset.ofHours(-5);
		OffsetTime offsetTime = OffsetTime.of(6, 1, 4, 0, offset);
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());

		offsetTime = OffsetTime.of(LocalTime.of(6, 1, 4, 0), offset);
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());
	}

	@Test
	public void parse() {
		OffsetTime offsetTime = OffsetTime.parse("06:01:04-05:00");
		System.out.println(offsetTime);
		assertEquals("06:01:04-05:00", offsetTime.toString());

		offsetTime = OffsetTime.parse("06:01:04.123456789-05:00");
		System.out.println(offsetTime);
		assertEquals("06:01:04.123456789-05:00", offsetTime.toString());
	}

	@Test
	public void from() {
		OffsetTime offsetTime = OffsetTime.parse("06:01:04.123456789-05:00");
		OffsetTime result = OffsetTime.from(offsetTime);
		System.out.println(result);
		assertEquals("06:01:04.123456789-05:00", result.toString());

		ZonedDateTime zonedDateTime = ZonedDateTime.parse("2023-11-11T06:01:04-05:00[Brazil/Acre]");
		result = OffsetTime.from(zonedDateTime);
		System.out.println(result);
		assertEquals("06:01:04-05:00", result.toString());
	}
}