Java 中的 Math. round(-1. 5) 等于多少？

答案：-1

/**

* Returns the closest {@code long} to the argument, with ties

* rounding to positive infinity.

*

*

Special cases:

*

• If the argument is NaN, the result is 0.

  *

• If the argument is negative infinity or any value less than or

  * equal to the value of {@code Long.MIN_VALUE}, the result is

  * equal to the value of {@code Long.MIN_VALUE}.

  *

• If the argument is positive infinity or any value greater than or

  * equal to the value of {@code Long.MAX_VALUE}, the result is

  * equal to the value of {@code Long.MAX_VALUE}.

*

* @param a a floating-point value to be rounded to a

* {@code long}.

* @return the value of the argument rounded to the nearest

* {@code long} value.

* @see java.lang.Long#MAX_VALUE

* @see java.lang.Long#MIN_VALUE

*/

看代碼的定義就是返回最接近參數的long型整數，如果有兩個，就返回大的那個；

通俗點直接+0.5后取整就是要的結果。

總結

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