minus

即时类minus()方法 (Instant Class minus() method)

Syntax:

句法：

public Instant minus(TemporalAmount t_amt);    public Instant minus(long amt, TemporalUnit t_unit);

• minus() method is available in java.time package.

  minus()方法在java.time包中可用。

• minus(TemporalAmount t_amt) method is used to subtract the given amount from this Instant and return the Instant.

  minus(TemporalAmount t_amt)方法用于从此Instant减去给定数量并返回Instant。

• minus(long amt, TemporalUnit t_unit) method is used to subtract the given amount in the given unit from this Instant and return the Instant.

  minus(long amt，TemporalUnit t_unit)方法用于从此Instant减去给定单位的给定数量，并返回Instant。

• These methods may throw an exception at the time of performing subtraction.

  这些方法在执行减法时可能会引发异常。

  • ArithmeticException: This exception may throw when the calculated result exceeds the limit to represent this object.ArithmeticException ：当计算结果超出表示此对象的限制时，可能引发此异常。
  • DateTimeException: This exception may throw when getting any error during subtraction.DateTimeException ：在减法过程中遇到任何错误时，都可能引发此异常。
  • UnsupportedTemporalTypeException: This exception may throw when the given unit is unsupported.UnsupportedTemporalTypeException ：当不支持给定单元时，可能引发此异常。

• These are non-static methods and it is accessible with class objects and if we try to access these methods with class name then we will get an error.

  这些是非静态方法，可通过类对象访问，如果尝试使用类名访问这些方法，则会收到错误消息。

Parameter(s):

参数：

• In the first case, "minus(TemporalAmount t_amt)",

  在第一种情况下，“ minus(TemporalAmount t_amt)”，

  • TemporalAmount t_amt – represents the amount to be subtracted from this Instant.
  • TemporalAmount t_amt –表示要从此Instant减去的数量。

• In the second case, "minus(long amt, TemporalUnit t_unit)",

  在第二种情况下，“减号(long amt，TemporalUnit t_unit)”，

  • long amt – represents the amount in units to be subtracted from this Instant.
  • long amt-表示要从此Instant减去的金额。
  • TemporalUnit t_unit – represents the unit to measure the given amount.
  • TemporalUnit t_unit –代表测量给定数量的单位。

Return value:

返回值：

In both the cases, the return type of the method is Instant,

在这两种情况下，方法的返回类型均为Instant 。

• In the first case, it returns the Instant that holds the value subtracted the given amount from this Instant.

  在第一种情况下，它返回的Instant保持从该Instant减去给定值的值。

• In the second case, it returns the Instant that holds the value subtracted the given amount in unit from this Instant.

  在第二种情况下，它返回的Instant保持从该Instant中减去以单位表示的给定值的值。

Example:

例：

// Java program to demonstrate the example // of minus() method of Instantimport java.time.*;import java.time.temporal.*;public class MinusOfInstant {
       public static void main(String args[]) {
           long amt = 2;        // Instantiates two Instant and        // a Duration object        Instant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");        Instant ins2 = Instant.now();        Duration du = Duration.ofSeconds(2);        // Display ins1,ins2        System.out.println("Instant ins1 and ins2: ");        System.out.println("ins1: " + ins1);        System.out.println("ins2: " + ins2);        System.out.println("amt to subtract: " + amt);        System.out.println("du to subtract: " + du);        System.out.println();        // Here, this method subtracts the given amount        // in the given unit from this Instant i.e. here        // we are subtracting 2 hours from Instant ins1        Instant minus_val = ins1.minus(amt, ChronoUnit.HOURS);        // Display minus_val        System.out.println("ins1.minus(amt,ChronoUnit.HOURS): " + minus_val);        // Here, this method subtracts the given amount        // from this Instant i.e. here we are subtracting        // 2 seconds from Instant ins2        minus_val = ins2.minus(du);        // Display minus_val        System.out.println("ins2.minus(du): " + minus_val);    }}

Output

输出量

Instant ins1 and ins2: ins1: 2006-04-03T05:10:15Zins2: 2020-05-28T01:06:04.706169Zamt to subtract: 2du to subtract: PT2Sins1.minus(amt,ChronoUnit.HOURS): 2006-04-03T03:10:15Zins2.minus(du): 2020-05-28T01:06:02.706169Z

翻译自:

minus