Java Collections Framework 源码分析(4.1 - Set) 前两篇文章介绍了 List 接口的两个实现类,List 数据结构的特定很明显,支持通过序号的随机访问,支持添加重复元素等。而本篇介绍的数据结构 Set 与List 有较大的差异,Set 不支持添加重复元素,也不支持随机访问某个元素,内部元素的存放也不一定是有序的。下面会介绍...
privatetransient HashMap<E,Object>map;// Dummy value to associate with an Object in the backing Mapprivatestaticfinal ObjectPRESENT=newObject(); 成员变量很简单,map是用来存放元素的,实际存放元素的是HashMap的 key,因此 value 部分用一个私有的静态变量PRESENT来填充,节约内存。
Returns an array containing all of the elements in this set. <T> T[]toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array. Methods inherited from interface java.util.Collection ...
Returns an array containing all of the elements in this set. <T> T[]toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array. Methods declared in interface java.util.Collection ...
In Java, EnumSet extends the AbstractSet and is implemented in the Set interface. This class is the member of the Java Collection Framework and also it can not be synchronized. EnumDet is faster than HashSet.Syntax:public abstract class EnumSet<E extends Enum<E>> ...
packageTest;importjava.util.ArrayList;importjava.util.Iterator;importjava.util.List;publicclassTestList{publicstaticvoidmain(String dd[]){// new了一个存储listList l=newArrayList();// 因为Collection framework只能存储对象所以new封装类l.add(newInteger(1));l.add(newInteger(2));l.add(newInteger(3...
InboundEnvironmentEndpointCollection 流入量 IngressTransportMethod InsightStatus IpAddress IpAddressRange IpFilterTag IpSecurityRestriction IssueType JavaVersion JwtClaimChecks KeyType KeyValuePairStringObject KeyVaultSecretStatus 种类 KubeEnvironmentCollection KubeEnvironmentPatchResource KubeEnvironmentProfile KubeEnviro...
Returns: the PerfMonSet object itself.withValues public PerfMonSet withValues(List values) Set the values property: Collection of workers that are active during this time. Parameters: values - the values value to set. Returns: the PerfMonSet object itself.Applies to Azure SDK for Java Latest在...
java.lang.Object类是java语言中的跟类,即所有类中的父类·它类Object是类层次结构的根类。每个类都使用Object作为超类。所有对象(包括数组)都实现这个类的方法。它包含11个方法。 1packagecn.itcast.demo01.demo01;23publicclassDemo01ToString {4publicstaticvoidmain(String[] args) {5// Person类默认继承了Ob...
import java.util.*; public class AbstractSetDemo2 { public static void main(String args[]) { AbstractSet<String> set = new TreeSet<String>(); set.add("Dog"); set.add("Cat"); set.add("Bird"); set.add("Tiger"); set.add("Rabit"); System.out.println("***"); System.out.prin...