前言

经常要判断传入的参数是否为空，或者对数组、集合进行一些操作：排序、反转

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ArrayUtils

import org.apache.commons.lang3.ArrayUtils;

判断数组/集合为空
https://www.cnblogs.com/onedir/p/4842828.html

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Arrays

import java.util.Arrays;

• equals(array1,array2)
• sort(array)
• toString(array)
• fill(array,val)
• binarySearch(array,val)
• copyof(array,length)

https://blog.csdn.net/xuehyunyu/article/details/76695576

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反转数组元素

public void invertUsingCollectionsReverse(Object[] array) {
	List<Object> list = Arrays.asList(array);
	Collections.reverse(list);
}

https://blog.csdn.net/neweastsun/article/details/79935638