LocalDate類isSupported()方法 (LocalDate Class isSupported() method)

Syntax:

句法：

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

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

  isSupported()方法在java.time包中可用。

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

  minus(TemporalAmount t_amt)方法用于從此LocalDate中減去給定的金額并返回LocalDate。

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

  minus(long amt，TemporalUnit t_unit)方法用于從此LocalDate中減去給定單位的給定數量，并返回LocalDate。

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

  這些方法在執行減法時可能會引發異常。

  • ArithmeticException: This exception may throw when the calculated result exceeds the limit to represent this object.ArithmeticException ：當計算結果超出表示此對象的限制時，可能引發此異常。
  • DateTimeException: This exception may throw when getting any error during subtraction.DateTimeException ：在減法過程中遇到任何錯誤時，都可能引發此異常。
  • UnsupportedTemporalTypeException: This exception may throw when the given unit is unsupported.UnsupportedTemporalTypeException ：當不支持給定單元時，可能引發此異常。

• 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.

  這些是非靜態方法，可通過類對象訪問，如果嘗試使用類名訪問這些方法，則會收到錯誤消息。

Parameter(s):

參數：

• In the first cases, minus(TemporalAmount t_amt),

  在第一種情況下，減號(TemporalAmount t_amt)，

  • TemporalAmount t_amt – represents the amount to be subtracted from this LocalDate.
  • TemporalAmount t_amt –表示要從此LocalDate中減去的數量。

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

  在第二種情況下，減號(long amt，TemporalUnit t_unit)，

  • long amt – represents the amount in units to be subtracted from this LocalDate.
  • long amt-表示要從此LocalDate中減去的金額(單位)。
  • TemporalUnit t_unit – represents the unit to measure the given amount.
  • TemporalUnit t_unit –代表測量給定數量的單位。

Return value:

返回值：

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

在這兩種情況下，方法的返回類型均為LocalDate 。

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

  在第一種情況下，它將返回LocalDate，該LocalDate保留從此LocalDate中減去給定值的值。

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

  在第二種情況下，它將返回LocalDate，該LocalDate保留從此LocalDate中減去以單位為單位的給定值的值。

Example:

例：

// Java program to demonstrate the example 
// of minus() method of LocalDate
import java.time.*;
import java.time.temporal.*;
public class MinusOfLocalDate {
public static void main(String args[]) {
long amt = 4;
// Instantiates two LocalDate
LocalDate l_da1 = LocalDate.parse("2007-04-04");
LocalDate l_da2 = LocalDate.now();
// Instantiates a Period 
Period weeks = Period.ofWeeks(2);
// Display l_da1,l_da2 and amt
System.out.println("LocalDate l_da1 and l_da2: ");
System.out.println("l_da1: " + l_da1);
System.out.println("l_da2: " + l_da2);
System.out.println("amt to subtract: " + amt);
System.out.println();
// Here, this method subtracts the given
// amount from this LocalDate l_da1 i.e.
// here we are subtracting 2 weeks from
// this date l_da1
LocalDate l_date = l_da1.minus(weeks);
// Display l_date
System.out.println("l_da1.minus(weeks): " + l_date);
// Here, this method subtracts the given
// amount in the given unit from 
// this LocalDate l_da2 i.e. here
// we are subtracting the given amt
// (4) in the given unit (in months) 
// from this date l_da2
l_date = l_da2.minus(amt, ChronoUnit.MONTHS);
// Display l_date
System.out.println("l_da2.minus(amt,ChronoUnit.MONTHS): " + l_date);
}
}

Output

輸出量

LocalDate l_da1 and l_da2: 
l_da1: 2007-04-04
l_da2: 2020-06-03
amt to subtract: 4l_da1.minus(weeks): 2007-03-21
l_da2.minus(amt,ChronoUnit.MONTHS): 2020-02-03

翻譯自: https://www.includehelp.com/java/localdate-minus-method-with-example.aspx