84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
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Java解析XML经常看到这段代码List<Element> listElement = node.elements()for(int i=0;i<= listElement.size();i++){Element n= listElement.get(i);}返回的这个List具体是?LinkedList是链表实现的,ArrayList是数组实现。如果是LinkedList这段代码的效率就会特别低。
List<Element> listElement = node.elements()
for(int i=0;i<= listElement.size();i++){
Element n= listElement.get(i);
}
用对象的getClass().getName()方法,或者用instanceof关键词
getClass().getName()
instanceof
属于ArrayList
用对象的
getClass().getName()
方法,或者用
instanceof
关键词属于ArrayList