IIterator an Iterator over the elements in this set Implements Iterator() Attributes RegisterAttribute Remarks Returns an iterator over the elements in this set. The elements are returned in no particular order. Java documentation forjava.util.HashSet.iterator(). ...
没有两端操作数据的方法 iterator();方法 hasNext(); next(); remove(); 迭代器遍历期间,不能使用 list 增删数据, 迭代期间删除必须使用 iterator.remove(); HashMap 哈希表 / 散列表 存放键值对数据 键不重复,数据无序 作用: 用键快速查找速度 方法: put(key,value); 放入键值对数据,重复键覆盖原值 get(...
既然HashSet是基于HashMap,那么对于HashSet而言,其方法的实现过程是非常简单的。 publicIterator<E>iterator() {returnmap.keySet().iterator(); } iterator()方法返回对此 set 中元素进行迭代的迭代器。返回元素的顺序并不是特定的。底层调用HashMap的keySet返回所有的key,这点反应了HashSet中的所有元素都是保存在...
Methods inherited from interface java.util.Collection parallelStream,removeIf,stream Methods inherited from interface java.lang.Iterable forEach Constructor Detail HashSet public HashSet() Constructs a new, empty set; the backingHashMapinstance has default initial capacity (16) and load factor (0.75)....
The iterators returned by this class's iterator method are fail-fast: if the set is modified at any time after the iterator is created, in any way except through the iterator's own remove method, the Iterator throws a ConcurrentModificationException. Thus, in the face of concurrent modificatio...
Methods inherited from interface java.util.Set add,addAll,clear,contains,containsAll,equals,hashCode,isEmpty,iterator,remove,removeAll,retainAll,size,toArray,toArray Methods inherited from interface java.util.Collection parallelStream,removeIf,stream ...
Methods Hashtable HexFormat ICollection IComparator IdentityHashMap IDeque IEnumeration IEventListener IFormattable IIterator IList IListIterator IllegalFormatCodePointException IllegalFormatConversionException IllegalFormatException IllegalFormatFlagsException ...
import java.util.Iterator;import java.util.TreeSet;publicclassSetTest{publicstaticvoidmain(String[]args){TreeSet<Dog>tree=newTreeSet<>();tree.add(newDog(1));tree.add(newDog(5));tree.add(newDog(3));Iterator<Dog>iter=tree.iterator();while(iter.hasNext()){System.out.println(iter.next(...
IteratorWithKey Enumerable EnumerableWithIndex EnumerableWithKey Sort Container Appendix Containers All data structures implement the container interface with the following methods: type Container interface { Empty() bool Size() int Clear() Values() []interface{} } Containers are either ordered or uno...
ReverseIteratorWithKey Enumerable EnumerableWithIndex EnumerableWithKey Sort Container Appendix Containers All data structures implement the container interface with the following methods: type Container interface { Empty() bool Size() int Clear() Values() []interface{} } Containers are either ordered ...