BigDecimal類的toBigIntegerExact()方法 (BigDecimal Class toBigIntegerExact() method)

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

  toBigIntegerExact()方法在java.math包中可用。

• toBigIntegerExact() method is used to convert this BigDecimal into the exact BigInteger value and it will throw an exception when this BigDecimal holds some fractional part that is other than 0.

  toBigIntegerExact()方法用于將此BigDecimal轉換為確切的BigInteger值，并且當此BigDecimal持有非0的小數部分時，它將引發異常。

• toBigIntegerExact() 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.

  toBigIntegerExact()方法是一個非靜態方法，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。

• toBigIntegerExact() method may throw an exception at the time of converting this object into BigInteger.

  在將此對象轉換為BigInteger時， toBigIntegerExact()方法可能會引發異常。

  ArithmeticException: This exception may throw when this BigDecimal object holds a decimal part that is other than 0.

  ArithmeticException ：當此BigDecimal對象包含非0的小數部分時，可能引發此異常。

Syntax:

句法：

    public BigInteger toBigIntegerExact();

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 BigInteger, it returns the exact conversion of this BigDecimal object value to a BigInteger value.

此方法的返回類型為BigInteger ，它將此BigDecimal對象值精確轉換為BigInteger值。

Example:

例：

// Java program to demonstrate the example 
// of BigInteger toBigIntegerExact() method of BigDecimal
import java.math.*;
public class ToBigIntegerExactOfBD {
public static void main(String args[]) {
// Initialize two variables - double and 
// String type
double val = 1234521.0;
String str = "1211124";
// Initialize two BigDecimal objects  
BigDecimal b_dec1 = new BigDecimal(val);
BigDecimal b_dec2 = new BigDecimal(str);
/* In this method it throws an exception
when we pass any non-zero value after 
decimal in this BigDecimal */
// converts this BigDecimal b_dec1 value into
// an exact BigInteger value, and store the result
// in a variable named b_int_conv
BigInteger b_int_conv = b_dec1.toBigIntegerExact();
System.out.println("b_dec1.toBigIntegerExact(): " + b_int_conv);
// converts this BigDecimal b_dec2 value into
// an exact BigInteger value, and store the result
// in a variable named b_int_conv
b_int_conv = b_dec2.toBigIntegerExact();
System.out.println("b_dec2.toBigIntegerExact(): " + b_int_conv);
}
}

Output

輸出量

b_dec1.toBigIntegerExact(): 1234521
b_dec2.toBigIntegerExact(): 1211124

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