Is there anyway to convert from double value to BigInteger?
是否存在将双值转换为BigInteger的方法?
double doubleValue = 64654679846513164.2;
BigInteger bigInteger = (BigInteger) doubleValue;
I try to cast it but it didn't work.
我试着浇铸它，但没有用。
3 个解决方案
#1
17
BigInteger is made for holding arbitrary precision integer numbers, not decimals. You can use the BigDecimal class to hold a double.
BigInteger用于保存任意精度的整数，而不是小数。可以使用BigDecimal类来保存双精度浮点数。
BigDecimal k = BigDecimal.valueOf(doublevalue);
In general, you cannot type cast a Java primitive into another class. The exceptions that I know about are the classes extending Number, such as the Long and Integer wrapper classes, which allow you to cast an int value into an Integer, and so on.
通常，不能将Java原语类型转换为另一个类。我所知道的例外是扩展数字的类，如Long和Integer包装器类，它允许您将int值转换为整数，等等。
#2
31
You can convert the double into a BigDecimal and then into a BigInteger:
你可以把double转换成BigDecimal，然后再转换成BigInteger:
BigInteger k = BigDecimal.valueOf(doublevalue).toBigInteger();
#3
-1
yo cannot cast Double to BigInteger, beacause these two classes are peer classes extending from Number class. you may be cast to Number and then can do further conversion.
您不能将Double强制转换为BigInteger，因为这两个类是从Number类扩展而来的对等类。你可以被转换成数字，然后可以做进一步的转换。
#1
17
BigInteger is made for holding arbitrary precision integer numbers, not decimals. You can use the BigDecimal class to hold a double.
BigInteger用于保存任意精度的整数，而不是小数。可以使用BigDecimal类来保存双精度浮点数。
BigDecimal k = BigDecimal.valueOf(doublevalue);
In general, you cannot type cast a Java primitive into another class. The exceptions that I know about are the classes extending Number, such as the Long and Integer wrapper classes, which allow you to cast an int value into an Integer, and so on.
通常，不能将Java原语类型转换为另一个类。我所知道的例外是扩展数字的类，如Long和Integer包装器类，它允许您将int值转换为整数，等等。
#2
31
You can convert the double into a BigDecimal and then into a BigInteger:
你可以把double转换成BigDecimal，然后再转换成BigInteger:
BigInteger k = BigDecimal.valueOf(doublevalue).toBigInteger();
#3
-1
yo cannot cast Double to BigInteger, beacause these two classes are peer classes extending from Number class. you may be cast to Number and then can do further conversion.
您不能将Double强制转换为BigInteger，因为这两个类是从Number类扩展而来的对等类。你可以被转换成数字，然后可以做进一步的转换。