* instance is emitted (int), followed by all of its elements * (each an Object) in the proper order. */ private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException{ // Write out element count, and any hidden stuff int expectedModCount = modCount; s.defaultWriteObje...
/*** Returns {@codetrue} if the iteration has more elements. * (In other words, returns {@codetrue} if {@link#next} would * return an element rather than throwing an exception.) * *@return{@codetrue} if the iteration has more elements*/booleanhasNext();/*** Returns the next eleme...
privatevoidensureExplicitCapacity(intminCapacity){//用于迭代器的fail fast机制modCount++;// overflow-conscious code//如果最小容量大于数组的长度,那么扩容。//否则,则不扩容。if(minCapacity-elementData.length>0)grow(minCapacity);} /** * Increases the capacity to ensure that it can hold at least th...
Object[] toArray()<T> T[] toArray(T[] contents) 调用toArray() 函数会抛出“java.lang.ClassCastException”异常,但是调用 toArray(T[] contents) 能正常返回 T[]。 toArray() 会抛出异常是因为 toArray() 返回的是 Object[] 数组,将 Object[] 转换为其它类型(如如,将Object[]转换为的Integer[])...
ArrayList 类位于 java.util 包中,使用前需要引入它,语法格式如下: importjava.util.ArrayList;// 引入 ArrayList 类ArrayList<E>objectName=newArrayList<>();// 初始化 E: 泛型数据类型,用于设置 objectName 的数据类型,只能为引用数据类型。 objectName: 对象名。
(overflow-conscious code)。即“a-b<0”而不是"a<b":int a = Integer.MAX_VALUE; int b = Integer.MAX_VALUE + 1; System.out.println(a < b); // false System.out.println(a - b < 0); // truetoArray()/** * Returns an array containing all of the elements in this list in ...
* Returns an {@link Iterator} for the elements in this object. * * @return An {@code Iterator} instance. */ Iterator<T> iterator(); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 当中Iterator例如以下: public interface Iterator<E> {
ArrayList 可能是 Java 数据结构中最简单的一种了,即使一个非 Java 程序员可能也知道这个数据结构,因为所有的语言中都有这样的类似的数据结构。但是在面试中很多人又对它又爱又恨,你真的了解 ArrayList 吗? 一、ArrayList 介绍及其源码剖析 1、什么是 ArrayList 可以简单的认为是一个动态数组;实际上 ArrayList 就...
Main.java import java.util.List; void main() { var words = List.of("wood", "forest", "falcon", "eagle"); System.out.println(words); var values = List.of(1, 2, 3); System.out.println(values); } In the example, we create two lists that have four and three elements. ...
Java Copy In this line of code,ArrayListdeclares a new ArrayList that can hold objects of type String.namesis the name of the ArrayList, andnew ArrayList()creates a new, empty ArrayList. You can add elements to an ArrayList using theaddmethod. For example: ...