絕對(duì)值函數(shù)使用說(shuō)明
絕對(duì)值函數(shù)是JDK中Math.java中的實(shí)現(xiàn)方法，其用來(lái)得到表達(dá)式的絕對(duì)值。
其實(shí)現(xiàn)非常簡(jiǎn)單，源碼如下：
/**
* Returns the absolute value of an {@code int} value.
* If the argument is not negative, the argument is returned.
* If the argument is negative, the negation of the argument is returned.
*
* <p>Note that if the argument is equal to the value of
* {@link Integer#MIN_VALUE}, the most negative representable
* {@code int} value, the result is that same value, which is
* negative.
*
* @param a the argument whose absolute value is to be determined
* @return the absolute value of the argument.
*/
public static int abs(int a) {
return (a < 0) ? -a : a;
}
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