Java 集合判空优化

Posted 2021-09-13 dingwen_blog

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.");

}