Java 如何在android中获取当前年份？
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How to get current year in android?
提问by Shubh
I tried
我试过
int year = Calendar.get(Calendar.YEAR);
but it is giving me compile time error that
但它给了我编译时错误
Non-static method 'get(int)' cannot be referenced from a static context.
不能从静态上下文中引用非静态方法“get(int)”。
I am calling this method from call method of observable.
我是从 observable 的 call 方法调用这个方法的。
Observable.combineLatest(ob1 ob2,
ob3, new Func3<String, String, String, Boolean>() {
@Override
public Boolean call(String a, String b, String c) {...
I had also seen (new Date()).getYear();but it is deprecated.
我也看过，(new Date()).getYear();但它已被弃用。
采纳答案by dsncode
Because you need to create an instance first.
因为你需要先创建一个实例。
try this
尝试这个
Calendar.getInstance().get(Calendar.YEAR);
and you are good to go.
你很高兴去。
回答by Rajen Raiyarela
you should use
你应该使用
Calendar.getInstance().get(Calendar.YEAR);
Calendar.getInstance().get(Calendar.YEAR);
回答by Wajid Ali
Yeah, you get an error because this is not a static method. First you need to create an instance of the Calendar class.
i.e.
是的，您会收到错误消息，因为这不是静态方法。首先，您需要创建 Calendar 类的实例。
IE
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
and here you get year, current year!
在这里你得到年份，当前年份！
回答by Wrong Chao
// get current year、month and day
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DATE);
// get current year millis
Time time = new Time(Time.TIMEZONE_UTC);
calendar.set(year, 0, 0, 0, 0, 0);
long year = calendar.getTimeInMillis();
time.set(year);
year = time.toMillis(true);
回答by Mustafa Karim
you can use Calendar.getInstance() .get(Calendar.YEAR )also for Kotlinlanguage purposes
您也Calendar.getInstance() .get(Calendar.YEAR )可以用于Kotlin语言目的
回答by Zidane
Have you tried the code below
你有没有试过下面的代码
Calendar c = Calendar.getInstance();
日历 c = Calendar.getInstance();
int seconds = c.get(Calendar.SECOND);
int hour = c.get(Calendar.HOUR_OF_DAY); // IF YOU USE HOUR IT WILL GIVE 12 HOUR USE HOUR_OF_DAY TO GET 24 HOUR FORMAT
int minutes = c.get(Calendar.MINUTE);
int date = c.get(Calendar.DATE);
int month = c.get(Calendar.MONTH) + 1; // in java month starts from 0 not from 1 so for december 11+1 = 12
int year = c.get(Calendar.YEAR);
回答by Basil Bourque
tl;dr
tl;博士
Year.now()
.getValue()
java.time
时间
The other Answers use the troublesome old date-time classes such as Calendar. These are supplanted by the java.time classes. For older versions of Android, see the ThreeTen-Backport and ThreeTenABP projects.
其他答案使用麻烦的旧日期时间类，例如日历。这些被 java.time 类取代。对于旧版本的 Android，请参阅 ThreeTen-Backport 和 ThreeTenABP 项目。
Yearclass
Year班级
Rather than pass around mere integers to represent a year, pass around objects. Namely, the Yearclass.
而不是传递仅仅代表一年的整数，而是传递对象。即Year类。
Getting the current year requires a time zone. For any given moment, the date varies around the globe by zone. So it is possible for Pacific/Aucklandto be on 2018 while America/Montrealis in 2017 simultaneously.
获取当前年份需要时区。对于任何给定时刻，日期因地区而异。所以有可能Pacific/Auckland在 2018 年同时America/Montreal在 2017 年。
Better to pass explicitly the desired/expected zone. If omitted, you implicitly get the JVM's current default time zone. That default can change at any moment during runtime, so it is not reliable.
最好明确地通过所需/预期的区域。如果省略，则隐式获取 JVM 的当前默认时区。该默认值可以在运行时随时更改，因此它不可靠。
ZoneId z = ZoneId.now( "Asia/Kolkata" ) ;
Year y = Year.now( z ) ;
When you do need an integer, extract the value.
当您确实需要一个整数时，请提取该值。
int yearNumber = y.getValue() ;
About java.time
关于 java.time
The java.timeframework is built into Java 8 and later. These classes supplant the troublesome old legacydate-time classes such as java.util.Date, Calendar, & SimpleDateFormat.
该java.time框架是建立在Java 8和更高版本。这些类取代了麻烦的旧的遗留日期时间类，例如java.util.Date, Calendar, & SimpleDateFormat。
The Joda-Timeproject, now in maintenance mode, advises migration to the java.timeclasses.
现在处于维护模式的Joda-Time项目建议迁移到java.time类。
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
要了解更多信息，请参阅Oracle 教程。并在 Stack Overflow 上搜索许多示例和解释。规范是JSR 310。
Where to obtain the java.time classes?
从哪里获得 java.time 类？
- Java SE 8, Java SE 9, and later
- Built-in.
- Part of the standard Java API with a bundled implementation.
- Java 9 adds some minor features and fixes.
- Java SE 6and Java SE 7
- Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport.
- Android
- The ThreeTenABPproject adapts ThreeTen-Backport(mentioned above) for Android specifically.
- See How to use ThreeTenABP….
- Java SE 8、Java SE 9及更高版本
- 内置。
- 具有捆绑实现的标准 Java API 的一部分。
- Java 9 添加了一些小功能和修复。
- Java SE 6和Java SE 7
- 多的java.time功能后移植到Java 6和7在ThreeTen-反向移植。
- 安卓
- 所述ThreeTenABP项目适应ThreeTen-反向移植（上述）为Android特异性。
- 请参阅如何使用ThreeTenABP ...。
