BigDecimal类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()方法用于将此BigDecimal转换为确切的long值。 当此BigDecimal的小数部分不为0或不在表示long的范围内时，则抛出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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  在将BigDecimal转换为long时， longValueExact()方法可能会引发异常。

  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 ：当此BigDecimal包含一个非0的小数部分或所得到的值不足以长时间调整时，可能会引发此异常。

Syntax:

句法：

public long longValueExact();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

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

此方法的返回类型为long ，它获取此BigDecimal的long表示形式。

Example:

例：

// Java program to demonstrate the example // of long longValueExact() method of BigDecimalimport 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

输出量

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

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