候选者：假设两个线程，线程A去读取CopyOnWriteArrayList的数据，还没读完 候选者：现在线程B把这个List给...
Boolean b = list1.addAll(2,list2); //把list2元素插入到list1中索引位置为2处。 System.out.println("list1:" + list); // [aaa,bbb,星期一,星期二,ccc] System.out.println("list1集合是否发生变化:" + b); // true b = list1.addAll(2,list3); //把list3元素插入到list1中索引位置为...
retainAll(coll);} } public void clear() { synchronized (mutex) {c.clear();} } public String toString() { synchronized (mutex) {return c.toString();} } // Override default methods in Collection @Override public void forEach(Consumer<? super E> consumer) { synchronized (mutex) {c.for...
Set集合中的对象不按特定方式排序,只是简单地把对象加入集合中,Set集合中不包含重复对象 Method Summary All MethodsInstance MethodsConcrete Methods 1packagezf.collection.set;23importjava.util.Collection;4importjava.util.Comparator;5importjava.util.HashSet;6importjava.util.TreeSet;7importjava.util.Iterator;8...
Each of these methods may be overridden if the collection being implemented admits a more efficient implementation. 这份说明其实和上面的 AbstractCollection 类的说明差不多,也分几个点: 1、该类提供了 List 接口的骨架实现,以最大限度地减少实现由 “随机访问” 数据存储(如数组)所支持的接口所需的工作...
List集合常用子类: ArrayList- 底层数据结构是数组。线程不安全 LinkedList- 底层数据结构是链表。线程不安全 Vector- 底层数据结构是数组。线程安全 System.arraycopy ArrayList中大多数操作数组的方法都是通过System.arraycopy来实现的. 需要注意的点: System.arraycopy是JVM 提供的数组拷贝实现. ...
In this example, we use Guava’sOrderingclass to sort a list of strings. The output shows the list sorted in alphabetical order. Each of these methods has its own benefits and drawbacks.Arrays.sort()is great for arrays,Stream.sorted()provides a functional programming approach, and Guava’sOr...
❮ LinkedList Methods ExampleGet your own Java Server Remove items from a list which do not belong to a specified collection: import java.util.LinkedList; public class Main { public static void main(String[] args) { LinkedList<String> cars = new LinkedList<String>(); cars.add("Volvo");...
Returns an unmodifiable list containing zero elements. Of(Object) Obsolete. Returns an unmodifiable list containing one element. Of(Object[]) Obsolete. Returns an unmodifiable list containing an arbitrary number of elements. Of(Object, Object) Obsolete. Returns an unmodifiable list containing...
此外有些迭代也是隐含的,比如容器类的toString方法,或containsAll, removeAll, retainAll等方法都会隐含地对容器进行迭代 并发容器类 正是由于同步容器类有以上问题,导致这些类成了鸡肋,于是Java5推出了并发容器类,Map对应的有ConcurrentHashMap,List对应的有CopyOnWriteArrayList。与同步容器类相比,它有以下特性: 更加细化...