minus

持续时间类minus()方法 (Duration Class minus() method)

Syntax:

句法：

    public Duration minus(Duration d);
public Duration 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(Duration d) method is used to subtract the given Duration from this Duration and returns the Duration.

  minus(Duration d)方法用于从此Duration中减去给定的Duration并返回Duration。

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

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

• 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。

• These are non-static methods and it is accessible with class objects and if we try to access these methods with the 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(Duration d),

  在第一种情况下， minus(Duration d) ，

  • Duration d – represents the Duration to be subtracted from this Duration.
  • 持续时间d –表示要从该持续时间中减去的持续时间。

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

  在第一种情况下， minus(long amt，TemporalUnit t_unit) ，

  • long amt – represents the amount in units to be subtracted from this Duration.
  • long amt-表示要从此工期中减去的金额。
  • 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 Duration,

在这两种情况下，方法的返回类型均为Duration 。

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

  在第一种情况下，它返回持续时间，该持续时间包含从该持续时间中减去给定持续时间的值。

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

  在第二种情况下，它返回持续时间，该持续时间保存的值是从该持续时间中减去一个单位的给定值。

Example:

例：

// Java program to demonstrate the example 
// of minus() method of Duration
import java.time.*;
import java.time.temporal.*;
public class MinusOfDuration {
public static void main(String args[]) {
long amt = 10;
// Instantiates two Duration objects
Duration du1 = Duration.ofMinutes(3);
Duration du2 = Duration.parse("P2DT2H20M20S");
// Display du1, du2 
System.out.println("du1: " + du1);
System.out.println("du2: " + du2);
System.out.println("amt to subtract: " + amt);
System.out.println();
// subtracts the given duration 
// from this Duration du2 and returns
// the Duration i.e. here we subtract
// the given 3 minutes from this du2 that holds
// the value of 2D:2H:20M:20S
Duration minus_val = du2.minus(du1);
// Display minus_val
System.out.println("du2.minus(du1): " + minus_val);
// subtracts the given amount 
// in the given unit from this Duration 
// and returns the Duration i.e. 
// here we are subtracting the amt
// 10 in minutes unit from this du2
// that holds the value of 2D:2H:20M:20S
minus_val = du2.minus(amt, ChronoUnit.MINUTES);
// Display minus_val
System.out.println("du2.minus(amt,ChronoUnit.MINUTES): " + minus_val);
}
}

Output

输出量

du1: PT3M
du2: PT50H20M20S
amt to subtract: 10du2.minus(du1): PT50H17M20S
du2.minus(amt,ChronoUnit.MINUTES): PT50H10M20S

翻译自: https://www.includehelp.com/java/duration-minus-method-with-example.aspx

minus