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Java中23种面试常考的设计模式之迭代器模式(Iterator)---行为型模式

【Java中23种面试常考的设计模式之迭代器模式(Iterator)---行为型模式】知识回顾:> 之前我们讲过的设计模式在这里呦:【面试最常见的设计模式之单例模式】【面试最常见的设计模式之工厂模式】【Java中23种面试常考的设计模式之备忘录模式(Memento)---行为型模式】【Jav...

Java 最常见面试题：迭代器 Iterator 是什么？

迭代器是一种设计模式，它是一个对象，它可以遍历并选择序列中的对象，而开发人员不需要了解该序列的底层结构。迭代器通常被称为“轻量级”对象，因为创建它的代价小。

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Java 最常见面试题：Iterator 怎么使用？有什么特点？

Java中的Iterator功能比较简单，并且只能单向移动：(1) 使用方法iterator()要求容器返回一个Iterator。第一次调用Iterator的next()方法时，它返回序列的第一个元素。注意：iterator()方法是java.lang.Iterable接口,被Collection继...

Java 最常见面试题：Iterator 和 ListIterator 有什么区别？

Iterator可用来遍历Set和List集合，但是ListIterator只能用来遍历List。 Iterator对集合只能是前向遍历，ListIterator既可以前向也可以后向。 ListIterator实现了Iterator接口，并包含其他的功能，比如：增加元素，替换元素，获取前一个和后一个...

＜Java八股文面试＞ArrayList源码 | Iterator源码 | LinkedList和ArrayList对比（下）

2.2 fail-fast和fail-safe源码剖析fail-fast源码分析当使用增强for迭代list集合时,会先创建一个Itr对象(属于Iterator类),为属性expectedModCount初始化.expectedModCount的初始值为list中的modCount (modCoun...

＜Java八股文面试＞ArrayList源码 | Iterator源码 | LinkedList和ArrayList对比（上）

1. ArrayList1.1 ArrayList 扩容规则介绍ArrayList() 会使用长度为零的数组ArrayList(int initialCapacity) 会使用指定容量的数组public ArrayList(Collection<? extends E> c) 会使用 c...

【Java每日面试题】Iterator迭代器到底是什么?（下）

remove()调用 ArrayList 本身的 remove() 方法删除 lastRet 位置元素，然后修改 modCount 即可。SubList.this#remove(lastRet)ArrayList#remove

【Java每日面试题】Iterator迭代器到底是什么?（上）

我们常使用 JDK 提供的迭代接口进行 Java 集合的迭代。Iterator iterator = list.iterator(); while (iterator.hasNext()) { String string = iterator.next(); //do something }迭代可以...

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