目录
1. Maven坐标
2. Object判空
3. Collection判空
4. Map判空
5. Array判空
1. Maven坐标
<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.12.0</version></dependency>
2. Object判空
import org.apache.commons.lang3.ObjectUtils;public class ObjectUtilsExample {public static void main(String[] args) {// 对 Object 进行判空Object obj1 = null;Object obj2 = "";Object obj3 = "hello";Ob