Java Calendar getInstance() 方法

2024 年 11 月 3 日 | 阅读 3 分钟

java.util.Calendar 类的 getInstance() 方法是一个静态方法。此方法用于 Calendar 对象，以获取根据 Java 运行时环境设置的当前时区的日历实例。

语法

public static Calendar getInstance()
public static Calendar getInstance(Locale aLocale)
public static Calendar getInstance(TimeZone zone, Locale aLocale)
public static Calendar getInstance(TimeZone zon)

参数

Locale 和 TimeZone 作为参数传递。

返回值

返回 Calendar 。

抛出

不抛出异常。

示例 1

import java.util.Calendar;
public class JavaCalendargetInstanceExample1 {
    public static void main(String args[]){
    Calendar mycal1 = Calendar.getInstance();
    Calendar mycal2 = Calendar.getInstance();
     mycal2.set(1996, 9 , 23);
     System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendat are equal");
    }
     else{
         System.out.println("both the instance of calendat are not equal");
     }
}
}

输出

mycal1 :Sat Aug 04 14:54:57 PDT 2018
mycal2 :Wed Oct 23 14:54:57 PDT 1996
both the instance of calendat are not equal

示例 2

import java.util.Calendar;
import java.util.GregorianCalendar;
public class JavaCalendargetInstanceExample2  extends GregorianCalendar {
    public static void main(String args[]){
    Calendar mycal1 = Calendar.getInstance();
    Calendar mycal2 = (GregorianCalendar)  GregorianCalendar.getInstance(){
     System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendat are equal");
    }
     else{
         System.out.println("both the instance of calendat are not equal");
          mycal1.clear();
         mycal2.clear();
         System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     }  
}
}

输出

mycal1 :Sat Aug 04 15:01:45 PDT 2018
mycal2 :Sat Aug 04 15:01:45 PDT 2018
both the instance of calendat are not equal
mycal1 :Thu Jan 01 00:00:00 PST 1970
mycal2 :Thu Jan 01 00:00:00 PST 1970

示例 3

import java.util.Calendar;
import java.util.Locale;
public class JavaCalendargetInstanceExample3 {
    public static void main(String args[]){
   //get instance method with locale as parameter
    Calendar mycal1 = Calendar.getInstance(new Locale("ja"));
    Calendar mycal2 = Calendar.getInstance(Locale.US);
     mycal2.set(1996, 9 , 23);
     System.out.println("mycal1 :" + mycal1.getTime() );
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendat are equal");
    }
     else{
         System.out.println("both the instance of calendat are not equal");
     }
}
}

输出

mycal1 :Sat Aug 04 23:23:00 PDT 2018
mycal2 :Wed Oct 23 23:23:00 PDT 1996
both the instance of calendat are not equal

示例 4

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;
public class JavaCalendargetInstanceExample4  extends GregorianCalendar {
    public static void main(String args[]){
    //get instance method with locale as parameter
    Calendar mycal1 = Calendar.getInstance(new Locale("ja"));
    Calendar mycal2 = (GregorianCalendar)  GregorianCalendar.getInstance(Locale.US);
     System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendat are equal");
    }
     else{
         System.out.println("both the instance of calendat are not equal");
          mycal1.clear();
         mycal2.clear();
         System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     }
}
}

输出

mycal1 :Sat Aug 04 23:25:44 PDT 2018
mycal2 :Sat Aug 04 23:25:44 PDT 2018
both the instance of calendat are not equal
mycal1 :Thu Jan 01 00:00:00 PST 1970
mycal2 :Thu Jan 01 00:00:00 PST 1970

示例 5

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
public class JavaCalendargetInstanceExample5  extends GregorianCalendar {
    public static void main(String args[]){
    //get instance method with  time zone  as parameter
    Calendar mycal1 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
    Calendar mycal2 = (GregorianCalendar)  GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC") );
     System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendar are equal");
    }
     else{
         System.out.println("both the instance of calendar are not equal");
          mycal1.clear();
         mycal2.clear();
         System.out.println("mycal1 :" + mycal1.getTime());
     System.out.println("mycal2 :" + mycal2.getTime());
     }
    }
    }

输出

mycal1 :Sun Aug 05 00:00:08 PDT 2018
mycal2 :Sun Aug 05 00:00:08 PDT 2018
both the instance of calendar are not equal
mycal1 :Wed Dec 31 16:00:00 PST 1969
mycal2 :Wed Dec 31 16:00:00 PST 1969

示例 6

import java.util.Calendar;
import java.util.TimeZone;
public class JavaCalendargetInstanceExample6 {
    public static void main(String args[]){
   //get instance method with  timezone as parameter
       Calendar mycal1 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
      Calendar mycal2 = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
     mycal2.set(1996, 9 , 23);
     System.out.println("mycal1 :" + mycal1.getTime() );
     System.out.println("mycal2 :" + mycal2.getTime());
     if(mycal1.equals(mycal2))
    {
        System.out.println("both the instance of calendar are equal");
    }
     else{
         System.out.println("both the instance of calendar are not equal");
     }
}
}

输出

mycal1 :Sun Aug 05 00:01:38 PDT 2018
mycal2 :Wed Oct 23 00:01:38 PDT 1996
both the instance of calendar are not equal

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Java Calendar getInstance() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

示例 4

示例 5

示例 6

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Java Calendar getInstance() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

示例 4

示例 5

示例 6

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