Objects.requireNonNull(filter); // figure out which elements are to be removed // any exception thrown from the filter predicate at this stage // will leave the collection unmodified int removeCount = 0; final BitSet removeSet = new BitSet(size); final int expectedModCount = modCount; fina...
java ArrayList size 1 没有元素 list.size() = 1 但是显示 All elements are null if (AmountResponseVOList == null || AmountResponseVOList.size() < 1 || AmountResponseVOList.get(0) == null) { } 加一个 AmountResponseVOList.get(0) == null 就可以判断是否包含数据了...
if (list == null || list.size() < 1 || list.get(0) == null) { return new ArrayList<>(); } 1. 2. 3.
AI代码解释 //尾端插入,即将节点值为e的节点设置为链表的尾节点voidlinkLast(Ee){final Node<E>l=last;//构建一个前驱prev值为l,节点值为e,后驱next值为null的新节点newNodefinal Node<E>newNode=newNode<>(l,e,null);//将newNode作为尾节点last=newNode;//如果原尾节点为null,即原链表为null,则链表...
Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This ...
ArrayList是Java集合中出场率最多的一个类。底层是基于数组实现,根据元素的增加而动态扩容,可以理解为它是加强版的数组。ArrayList允许元素为null。它是线程不安全的。 数据结构 实现继承关系 1publicclassArrayList<E>extendsAbstractList<E>2implementsList<E>, RandomAccess, Cloneable, java.io.Serializable ...
版本jdk1.8 * Resizable-array implementation of the <tt>List</tt> interface. Implements * all optional list operations, and permits all elements, including * <tt>null</tt>. In…
Constructs a list containing the elements of the specified collection, in the order they are returned by the collection's iterator. Parameters: c- the collection whose elements are to be placed into this list Throws: NullPointerException- if the specified collection is null ...
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException { // Write out any hidden serialization magic s.defaultWriteObject(); // Write out size s.writeInt(size); // Write out all elements in the proper order. for (LinkedList.Node<E> x = first; x != null; ...
Resizable-array implementation of the List interface. Implements all optional list operations, and permits all elements, including null. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to ...