JavaSE (46)

java中数组的length长度为初始化时指定的长度, 和集合不一样

import org.apache.commons.lang3.StringUtils;

/**
 * @description 数组简易工具类
 * @Date 2020/6/16 17:59
 */
public class ArrayUtils {

    public static boolean isAllEmpty(String[] arr) {
        if (arr == null || arr.length == 0) {
            return false;
        }
        boolean isAllEmpty = true;
        for (String str : arr) {
            if (StringUtils.isNotBlank(str)) {
                isAllEmpty = false;
                break;
            }
        }
        return isAllEmpty;
    }
     
   // 简单测试
    public static void main(String[] args) {
        System.out.println(isAllEmpty(new String[2]));
        System.out.println(isAllEmpty(new String[3]));
        String[] strings = new String[3];
        strings[0] = "";
        System.out.println(isAllEmpty(strings));

        String[] strings2 = new String[3];
        strings2[2] = "1";
        System.out.println(isAllEmpty(strings2));
    }
}