遍历Java集合(Arraylist,HashSet...)的元素时,可以采用Iterator迭代器来操作 Iterator接口有三个函数,分别是hasNext(),next(),remove()。 今天浅谈remove函数的作用 官方解释为: Removesfromthe underlying collection the last element returned bythisiterator (optional operation). This method can be called only o...
HashSet和HashMap一样也需要实现hash算法来计算对象的hash值,但不同的是,HashMap中添加一个键值对的时候, (Key, Value),hash函数计算的是Key的hash值。而HashSet则是计算value的hash值。当我们调用HashSet的add(E e)的方法 的时候,我们会计算机元素e的hash值,如果这个值之前没出现过,就说明这个元素在set中不...
peek方法 peek类操作其实比较简单。因为有一个head节点去维护当前的队首元素。只有判断先first(head的后继)是否为空就好。 代码语言:javascript 代码运行次数:0 publicEpeek(){if(count.get()==0)returnnull;final ReentrantLock takeLock=this.takeLock;takeLock.lock();try{Node<E>first=head.next;if(first==...
方法中设置了一个removeSet,把满足条件的元素索引坐标都放入removeSet,然后统一对removeSet中的索引进行移除。源码相对复杂的是BitSet模型,源码这里不再贴了。 public boolean removeIf(Predicate<? super E> filter) Objects.requireNonNull(filter); // figure out which elements are to be removed // any exceptio...
Remove-CMTSStepSetVariable Remove-CMTSStepUpgradeOperatingSystem Remove-CMUpdateGroupDeployment Remove-CMUser Remove-CMUserAffinityFromDevice Remove-CMUserCollectionDirectMembershipRule Remove-CMUserCollectionExcludeMembershipRule Remove-CMUserCollectionIncludeMembershipRule Remove-CMUserCollectionQueryMembershipRule Remov...
Set-CMAccessAccount Set-CMAccount Set-CMActiveDirectoryForest Set-CMAdvancedThreatProtectionPolicy Set-CMAlert Set-CMAlertSubscription Set-CMAntimalwarePolicy Set-CMApplication Set-CMApplicationDeployment Set-CMApplicationGroup Set-CMApplicationGroupDeployment Set-CMApplicationPhasedDeployment Set-CMApplicationSuper...
setConfiguration(configuration); }; } } 序列化枚举值为前端返回值 从数据库读数据时,将数据库字段的值转换为描述类的文字展示有以下三种方式。 方式一、通过Jackson处理 一、通过Spring Boot重写toString方法 @Bean public Jackson2ObjectMapperBuilderCustomizer customizer(){ return builder -> builder.featuresTo...
Java documentation forjava.util.Set.remove(java.lang.Object). Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. ...
in 查询 超过1000条 处理 insert batch操作 查询结果 Map 接收 key 大小写问题 配置全局的配置 统一大小写 封装对象继承 HashMap 重写 put Insert 多 Value 写法 Mysql Oracle DatabaseId 的使用 Mybatis Repalce into 判断批量新增或者修改 Mybatis批量插入的时候判断,根据主键或者唯一索引(组合索引) ...
process in interface InvocableMap.EntryProcessor<K,V,V> Parameters: entry - the Entry to process Returns: the result of the processing, if any processAll public Map<K,V> processAll(Set<? extends InvocableMap.Entry<K,V>> setEntries) Process a Set of InvocableMap.Entry objects. ...