BigDecimal類longValueExact()方法 (BigDecimal Class longValueExact() method)

• longValueExact() method is available in java.math package.

  longValueExact()方法在java.math包中可用。

• longValueExact() method is used to convert this BigDecimal to an exact long value. When this BigDecimal holds a fractional part other than 0 or not in a range to represent long then ArithmeticException is thrown.

  longValueExact()方法用于將此BigDecimal轉換為確切的long值。 當此BigDecimal的小數部分不為0或不在表示long的范圍內時，則拋出ArithmeticException。

• longValueExact() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  longValueExact()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• longValueExact() method may throw an exception at the time of converting BigDecimal to the long.

  在將BigDecimal轉換為long時， longValueExact()方法可能會引發異常。

  ArithmeticException: This exception may throw when this BigDecimal holds a fractional part that is other than 0 or the resulting value is not enough to adjust in a long.

  ArithmeticException ：當此BigDecimal包含一個非0的小數部分或所得到的值不足以長時間調整時，可能會引發此異常。

Syntax:

句法：

    public long longValueExact();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of this method is long, it gets the long representation of this BigDecimal.

此方法的返回類型為long ，它獲取此BigDecimal的long表示形式。

Example:

例：

// Java program to demonstrate the example 
// of long longValueExact() method of BigDecimal
import java.math.*;
public class LongValueExactOfBD {
public static void main(String args[]) {
// Initialize two variables first is
// of "float" and second is of "String"
// type
float val = 11562387.23f;
String str = "100";
// Initialize two BigDecimal objects  
BigDecimal b_dec1 = new BigDecimal(val);
BigDecimal b_dec2 = new BigDecimal(str);
// convert this BigDecimal (b_dec1) into
// a exact long, variable named l_conv
long l_conv = b_dec1.longValueExact();
System.out.println("b_dec1.longValueExact(): " + l_conv);
// convert this BigDecimal (b_dec2) into
// a exact long, variable named l_conv
l_conv = b_dec2.longValueExact();
System.out.println("b_dec2.longValueExact(): " + l_conv);
}
}

Output

輸出量

b_dec1.longValueExact(): 11562387
b_dec2.longValueExact(): 100

翻譯自: https://www.includehelp.com/java/bigdecimal-longvalueexact-method-with-example.aspx