NoSuchElementException- if the iteration has no previous element nextIndex int nextIndex() Returns the index of the element that would be returned by a subsequent call tonext(). (Returns list size if the list iterator is at the end of the list.) ...
其内部原理是一个 Iteration 迭代器,在遍历的过程中,不能对集合中的元素进行增删操作。 2.3.1 语法 代码语言:javascript 代码运行次数:0 运行 AI代码解释 for(元素的数据类型 变量 : Collection集合/数组){ ··· } 2.3.2 示例 代码语言:javascript 代码运行次数:0 运行 AI代码解释 public class Demo...
* * @return an iterator over the elements in this list in proper sequence */ public Iterator<E> iterator() { return new Itr(); } /** * An optimized version of AbstractList.Itr */ private class Itr implements Iterator<E> { int cursor; // index of next element to return int lastRet...
//: holding/ListIteration.javapackageobject;importtypeinfo.pets.*;importjava.util.*;publicclassListIteration {publicstaticvoidmain(String[] args) { List<Pet> pets = Pets.arrayList(8); ListIterator<Pet> it =pets.listIterator();while(it.hasNext()) System.out.print(it.next()+ ", " + it....
Java提供了四种在集合上遍历的方法,包括循环,迭代和forEach(从Java 8开始) before going to each kind of iteration, suppose that we have a List collection as follows: 在学习每种遍历方式之前,我们需要现有一组List集合: publicstaticvoidmain(String[] args) { ...
除了使用迭代器遍历List,还可以使用for-each循环来简化代码。for-each循环是Java 5引入的一种新的循环结构,可以遍历任何实现了Iterable接口的集合对象。 下面是一个使用for-each循环遍历List的示例代码: importjava.util.ArrayList;importjava.util.List;publicclassListIterationExample{publicstaticvoidmain(String[]args)...
Iteration. As another example of how lambdas and functional approaches change the approach to code, consider one of the fundamental operations done with collections: that of iterating over them. Java 8 will bring to collections a change via the forEach() default method defined on the Iterator ...
public List<Integer> forCStyleWithIteration(BenchMarkState state){ int size = state.testData.size(); List<Integer> result = new ArrayList<>(size); Iterator<Integer> iteration = state.testData.iterator(); for(int j = 0; j < size; j ++){ ...
Performs the given action for each element of theIterableuntil all elements have been processed or the action throws an exception. Unless otherwise specified by the implementing class, actions are performed in the order of iteration (if an iteration order is specified). Exceptions thrown by the ac...
publicList<Integer> forCStyleWithIteration(BenchMarkState state){ intsize = state.testData.size(); List<Integer> result = newArrayList<>(size); Iterator<Integer> iteration = state.testData.iterator(); for(intj = 0; j < size; j ++){ ...