文章目录
//反例
LinkedList<Object> collection = new LinkedList<>();
if (collection.size() == 0){
System.out.println("collection is empty.");
}
// 正例
LinkedList<Object> collection = new LinkedList<>();
if (collection.isEmpty()){
System.out.println("collection is empty.");
}
//检测是否为null 可以使用CollectionUtils.isEmpty()
if (CollectionUtils.isEmpty(collection)){
System.out.println("collection is null.");
}