时间：2022-08-11 11:28:35 | 栏目：JAVA代码 | 点击：次
1、CollectionUtils.isEmpty(null): true
2、例：List<String> a = new ArrayList<>(); //a.size()==0
CollectionUtils.isEmpty(a): true
3、例：
List<String> list = new ArrayList<>();
list.add("a");
list.add("b");
System.out.println(list); //list.size()==2
CollectionUtils.isEmpty(list): false
1、CollectionUtils.isNotEmpty(null): false
2、例：List<String> a = new ArrayList<>(); //a.size()==0
CollectionUtils.isNotEmpty(a): false
3、例：
List<String> list = new ArrayList<>();
list.add("a");
list.add("b");
System.out.println(list); //list.size()==2
CollectionUtils.isNotEmpty(list): true
public static boolean isNotEmpty(Collection coll) {
return !isEmpty(coll);
}
public static boolean isEmpty(Collection coll) {
return coll == null || coll.isEmpty();
}
org.springframework.util.CollectionUtils
//Collection
public static boolean isEmpty(Collection collection)
{
return collection == null || collection.isEmpty();
}
//Map
public static boolean isEmpty(Map map)
{
return map == null || map.isEmpty();
}