list.add("world");list.add("world");list.add("world");list.add("world"); list.add("java");list.add("hello");list.add("world");list.add("java");list.add("world"); for (int x = 0; x < list.size() - 1; x++) { for (int y = x + 1; y < list.size(); y++) ...
ArrayList list =newArrayList(); list.add("a"); list.add("b"); list.add("c"); Iterator it = list.iterator(); while(it.hasNext()){ String str = (String) it.next(); System.out.println(str); } } } 运行结果: a b c 可以看到,Iterator可以不用管底层数据具体是怎样存储的,都能够通过...
publicclassListIteratorDemo {publicstaticvoidmain(String[] args) { List list=newArrayList(); list.add("one"); list.add("two"); list.add("three"); list.add("five");/*for(Iterator it = list.iterator(); it.hasNext();){Object obj = it.next();if(obj.equals("five")){ 在迭代过程...
Unlike the other abstract collection implementations, the programmer does not have to provide an iterator implementation; the iterator and list iterator are implemented by this class, on top of the “random access” methods: get(int), set(int, E), add(int, E) and remove(int). The documen...
(nonstatic) inner class. Note well that each instance contains an implicit* reference to the containing list, allowing it to access the list's members.*/privateclassArrayIteratorimplementsIterator<E>{/** Index of the next element to report. */privateintj=0;// index of the next element to...
1 for (String s : list) { 2 System.out.println(s); 3 } 1. 2. 3. 迭代器接口定义 首先来看下迭代器的接口定义如下: 1 public interface Iterator<E> { 2 3 boolean hasNext(); 4 5 E next(); 6 7 default void remove() { 8 throw new UnsupportedOperationException("remove"); ...
inttemperature =30; if(temperature >25) {// 条件表达式: temperature > 25 System.out.println("It's a hot day!");// 当temperature > 25时执行 } // 如果temperature <= 25,则跳过if块内的语句 System.out.println("...
iterator(); // 获取列表的迭代器 while (iterator.hasNext()) { String element = iterator.next(); System.out.println(element); // 输出:apple, banana, orange } Object[] array = list.toArray(); // 将列表转换为数组 System.out.println(Arrays.toString(array)); // 输出:[apple, banana, ...
Returns true if this list iterator has more elements when traversing the list in the reverse direction. Enext() Returns the next element in the list and advances the cursor position. intnextIndex() Returns the index of the element that would be returned by a subsequent call to next(). Epr...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 packagejava.util;publicinterfaceListIterator<E>extendsIterator<E>{// Query OperationsbooleanhasNext();Enext();booleanhasPrevious();Eprevious();intnextIndex();int