Check Empty List-->Traverse List Traverse List-->Reverse Element section 逆向遍历 Reverse Element-->Reverse List section 结束 Reverse List-->End 具体实现 步骤1:初始化 首先,我们需要创建一个List对象,用于存储元素。可以使用ArrayList作为示例。 // 创建一个新的List对象List<String>list=newArrayList<>()...
List<Phone> phones = Phone.list(); ListIterator<Phone> it = phones.listIterator(); while (it.hasNext()) { System.out.println(it.next() + ",nextIndex:" + it.nextIndex() + ",previousIndex:" + it.previousIndex()+";"); } // 从后往前遍历 System.out.print("reverse traverse->" )...
public void reverseTraverse(List<Integer> list){ ListIterator<Integer> it = list.listIterator(list.size()); while(it.hasPrevious()){ System.out.println(it.previous()); } } 迭代的陷阱 关于迭代器,有一种常见的误用,就是在迭代的中间调用容器的删除方法,比如要删除一个整数ArrayList中所有小于100的...
createDate desc //Comparator.reverseOrder():降序 Comparator.naturalOrder():升序 //方式一:多个字段排序(多余两个) //先以属性SaleNum降序,再进行属性BatchAvailableNum升序 多个字段 后面追加即可 // List<Ticket> sortList = list.stream() // .sorted(Comparator.comparing(Ticket::getSaleNum,Comparator....
reverse:将线性表进行逆序操作,这个可是从前数据结构的经典考题哦! rotate:以某个元素为轴心将线性表“旋转”。 swap:交换一个线性表中两个元素的位置。 …… Collections还有一个重要功能就是“封装器”(Wrapper),它提供了一些方法可以把一个集合转换成一个特殊的集合,如下: unmodifiableXXX:转换成只读集合,这里XXX...
reverse— reverses the order of the elements in a List. rotate— rotates all the elements in a List by a specified distance. swap— swaps the elements at specified positions in a List. replaceAll— replaces all occurrences of one specified value with another. fill— overwrites every element ...
Collections.reverse(list); assertThat(result, equalTo(list));Copy You may also search, add or remove elements using iterators. 5. Search theArrayList We will demonstrate how searching works using a collection: List<String> list = LongStream.range(0,16) ...
容器相关的操作及其源码分析 说明 1、本文是基于JDK 7 分析的。JDK 8 待我工作了得好好研究下。Lambda、Stream。 2、本文会贴出大量的官方注释文档,强迫自己...
Returns true if this list iterator has more elements when traversing the list in the reverse direction. E next() Returns the next element in the list and advances the cursor position. int nextIndex() Returns the index of the element that would be returned by a subsequent call to next(). ...
sorted(Map.Entry.comparingByValue(Comparator.reverseOrder())) .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (oldValue, newValue) -> oldValue, LinkedHashMap::new)); //根据key正序 Map<String, Integer> result3 = map.entrySet().stream(). sorted(Map.Entry.comparingByKey...