(1)类型转换异常:ClassCastException;集合中存放的是多个对象时,在强转时会出现; packagecom.oracle.demo01;importjava.util.ArrayList;importjava.util.Collection;importjava.util.Iterator;publicclassdemo01 {publicstaticvoidmain(String[] args) {method03(); }publicstaticvoidmethod03(){ Collection col=newArray...
https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html http://javahungry.blogspot.com/2014/04/fail-fast-iterator-vs-fail-safe-iterator-difference-with-example-in-java.html http://www.cnblogs.com/dolphin0520/p/3933551.html http://blog.csdn.net/chenssy/article/details/38151189 ...
大杂烩 -- Java中Iterator的fast-fail分析 Java中的Iterator非常方便地为所有的数据源提供了一个统一的数据读取(删除)的接口,但是新手通常在使用的时候容易报如下错误ConcurrentModificationException,原因是在使用迭代器时候底层数据被修改,最常见于数据源不是线程安全的类,如HashMap & ArrayList等。 为什么要有fast-fail...
Iterator takes the place of Enumeration in the Java collections framework. Iterators differ from enumerations in two ways: Iterators allow the caller to remove elements from the underlying collection during the iteration with well-defined semantics. Method names have been improved. This interface ...
Oracle JDK7/8的逃逸分析（escape analysis）可以抵消掉for-in循环里隐式创建的Iterator：ArrayList$Itr，...
还留着Enumerati…Iterator在功能上可以完全替代Enumeration。后者目前还保留在Java标准库里纯粹是为了兼容老...
java.lang.Object com.oracle.coherence.common.collections.AbstractStableIterator<T> com.tangosol.net.partition.AbstractPartitionedIterator<T> com.tangosol.net.partition.PartitionedIterator<T> All Implemented Interfaces: Enumeration<T>, Iterator<T> public class PartitionedItera...
第二个问题:授你以渔,自己看文档https://docs.oracle.com/javase/10/docs/api/java/util/Iterator.html 0 回复 #1 奶尤糯米团子 提问者 看了你的“渔”,里面说的hasNext() returns true if the iteration has more elements. next() returns the next element in the iteration. 所以当hasNext()返回...
Important Methods Used by the Java Iterator: 1) boolean hasNext(): this method returns true when there is another element to be traversed in the collection. 2) Object next(): It provides the next object to be traversed. This method throws an exception if there are no more elements to be...
// https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html class PeekingIterator implements Iterator<Integer> { private Iterator<Integer> iter; private Integer next; public PeekingIterator(Iterator<Integer> iterator) { // initialize any member here. ...