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//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.");

}