问题描述
写一个函数来确定数组中的最小值/最大值很简单,例如:
It's trivial to write a function to determine the min/max value in an array, such as:
/** * * @param chars * @return the max value in the array of chars */ private static int maxValue(char[] chars) { int max = chars[0]; for (int ktr = 0; ktr < chars.length; ktr++) { if (chars[ktr] > max) { max = chars[ktr]; } } return max; }
但这不是已经在某个地方完成了吗?
but isn't this already done somewhere?
推荐答案
使用 Commons Lang(转换)+ Collections(转换为最小值/最大值)
Using Commons Lang (to convert) + Collections (to min/max)
import java.util.Arrays; import java.util.Collections; import org.apache.commons.lang.ArrayUtils; public class MinMaxValue { public static void main(String[] args) { char[] a = {'3', '5', '1', '4', '2'}; List b = Arrays.asList(ArrayUtils.toObject(a)); System.out.println(Collections.min(b)); System.out.println(Collections.max(b)); } }
请注意,Arrays.asList() 包装了底层数组,因此它不应占用太多内存,也不应对数组元素执行复制.
Note that Arrays.asList() wraps the underlying array, so it should not be too memory intensive and it should not perform a copy on the elements of the array.