线程安全的map在JDK 1.5及其更高版本环境有哪几种方法可以实现()。A、Map map = new HashMap()B、Map map = new TreeMap()C、Map map = new ConcurrentHashMap()D、Map map = Collections.synchronizedMap(new HashMap())

线程安全的map在JDK 1.5及其更高版本环境有哪几种方法可以实现()。

  • A、Map map = new HashMap()
  • B、Map map = new TreeMap()
  • C、Map map = new ConcurrentHashMap()
  • D、Map map = Collections.synchronizedMap(new HashMap())

相关考题:

WhichofthefollowingcombinationofSS7protocolsarespecifictoGSMnetworksonly()。A.MAP,BSSAPB.MAP,BSSAP,TUPC.MAP,BSSAP,ISUP,SCCPD.MAP,BSSAP,TCAP,SCCP,MTP

关于map,下面说法正确的是() A. map反序列化时json.unmarshal的入参必须为map的地址B. 在函数调用中传递map,则子函数中对map元素的增加不会导致父函数中map的修改C. 在函数调用中传递map,则子函数中对map元素的修改不会导致父函数中map的修改D. 不能使用内置函数delete删除map的元素

Given:11.%java.util.Mapmap=newjava.util.HashMap();12.request.setAttribute(map%java.util.Mapmap=newjava.util.HashMap();12.request.setAttribute(map,map);13.map.put(a,b);14.map.put(b,c);15.map.put(c,d);%16.%--insertcodehere--%WhichthreeELexpressions,insertedatline16,arevalidandevaluatetod?()A.${map.c}B.${map[c]}C.${map[c]}D.${map.map.b}E.${map[map.b]}

给定如下Java程序代码片段,编译运行这段代码,结果是( )。java.util.HashMapmap=newjava.util.HashMap();map.put("name",null);map.put("name","Jack");System.out.println(map.get("name"));A.nullB.JackC.nullJackD.运行时出现异常

ASA/PIXversion7.0introducedModularPolicyFramework(MPF)asanextensiblewaytoclassifytraffic,andthenapplypolicies(oractions)tothattraffic.MPFataminimum requireswhichthreecommands?() A.http-map,tcp-map,class-mapB.class-map,tcp-map,policy-mapC.class-map,policy-map,service-mapD.class-map,service-policy,policy-map

What is the purpose of the inverse ARP?()A、to map a known DLCI to an IP addressB、to map a known IP address to a MAC addressC、to map known SPID to a MAC addressD、to map a known DLCI to a MAC addressE、to map a known IP address to a SPIDF、to map a known MAC address to an IP address

对于Map("book"-5,"pen"-2).map(m=m._1-m._2*2)结果说法正确的是?()A、Map("bookbook"-5,"penpen"-2)B、Map("bookbook"-10,"penpen"-4)C、Map("book"-10,"pen"-4)D、Map("book"-5,"pen"-2,"book"-5,"pen"-2)

ASA/PIXversion 7.0 introduced ModularPolicyFramework (MPF) as anextensible wayto classify traffic,and then apply policies (or actions) to that traffic. MPF at aminimum requires which three commands?()A、 http-map, tcp-map, class-mapB、 class-map, tcp-map, policy-mapC、 class-map, policy-map, service-mapD、 class-map, service-policy, policy-map

Given: 11.% java.util.Map map = new java.util.HashMap(); 12.request.setAttribute("map", map); 13.map.put("a", "b"); 14.map.put("b", "c"); 15.map.put("c", "d"); % 16.%-- insert code here --% Which three EL expressions, inserted at line 16, are valid and evaluate to "d"?()A、${map.c}B、${map[c]}C、${map["c"]}D、${map.map.b}E、${map[map.b]}

下面哪种是正确的创建Map集合的方式()。A、Map m=new Map();B、Map m=new Map(init capacity,increment capacity);C、Map m=new Map(new Collection());D、Map是接口,所以不能实例化。

给定如下Java程序代码片段,编译运行这段代码,结果是()。 java.util.HashMap map=new java.util.HashMap(); map.put("name",null); map.put("name","Jack"); System.out.println(map.get("name"));A、nullB、JackC、nullJackD、运行时出现异常

What is the purpose of the inverse ARP?()A、to map a known DLCI to an IP addressB、to map a known IP address to a MAC addressC、to map known SPID to a MACaddressD、to map a known DLCI to a MAC addressE、to map a known IP address to a SPIDF、to map a known MAC address to an IP address

在以下所列的信令组合中,()是GSM网络所专用的。A、MAP,BSSAP,TUPB、MAP,BSSAP,ISUP,SCCPC、MAP,BSSAP,TCAP,SCCP,MTPD、MAP,SCCP,BSSAP,INAP

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平均动脉压(MAP)的计算公式是()A、MAP=DBP+2/3(SBP-DBP)B、MAP=DBP+1/3(SBP-DBP)C、MAP=1/3(2SBP+DBP)D、MAP=2/3(SBP+2DBP)E、MAP=2DBP+1/3SBP

Given: 11.% java.util.Map map = new java.util.HashMap(); 12.request.setAttribute("map", map); 13.map.put("a", "true"); 14.map.put("b", "false"); 15.map.put("c", "42"); % Which three EL expressions are valid and evaluate to true?()A、${not map.c}B、${map.d or map.a}C、${map.a and map.d}D、${map.false or map.true}E、${map.a and map.b or map.a}

下列Map的泛型声明中正确的是哪项?()  A、Map〈String〉B、Map〈String,String〉C、Map(String)D、Map()

现有:  1. import java.util.*;      2.  3. Class FindStuff  {  4.public static void main (String[]args)    {      5,    //insert code here      6.    c.put ("X", 123);      7.    }      8.  } 分别插入到第5行,哪三行允许代码编译?()    A、 Map c= new SortedMap();B、 HashMap c= new HashMap();C、 HashMap c= new Hashtalole();D、 SortedMap c= new TreeMap();E、 ArrayList c= new ArrayList();F、  MaD c = new LinkedHashMap();

1. import java.util.*;  2.  3. Class FindStuff {  4. public static void  main(String [] args) {  5. // insert code here  6. c.put("x", 123);  7. }  8. } 分别插入到第5行,哪三行允许代码编译?() A、Map c = new SortedMap();B、HashMap c = new HashMap();C、HashMap c = new Hashtable();D、SortedMap c = new TreeMap();

多选题Given: 11. Which three EL expressions are valid and evaluate to true?()A${not map.c}B${map.d or map.a}C${map.a and map.d}D${map.false or map.true}E${map.a and map.b or map.a}

单选题ASA/PIXversion 7.0 introduced ModularPolicyFramework (MPF) as anextensible wayto classify traffic,and then apply policies (or actions) to that traffic. MPF at aminimum requires which three commands?()A http-map, tcp-map, class-mapB class-map, tcp-map, policy-mapC class-map, policy-map, service-mapD class-map, service-policy, policy-map

单选题What is the purpose of the inverse ARP?()Ato map a known DLCI to an IP addressBto map a known IP address to a MAC addressCto map known SPID to a MACaddressDto map a known DLCI to a MAC addressEto map a known IP address to a SPIDFto map a known MAC address to an IP address

单选题What is the purpose of the inverse ARP?()Ato map a known DLCI to an IP addressBto map a known IP address to a MAC addressCto map known SPID to a MAC addressDto map a known DLCI to a MAC addressEto map a known IP address to a SPIDFto map a known MAC address to an IP address

多选题Given: 11. 16. Which three EL expressions, inserted at line 16, are valid and evaluate to "d"?()A${map.c}B${map[c]}C${map[c]}D${map.map.b}E${map[map.b]}

多选题Given: 11. 16. Which three EL expressions, inserted at line 16, are valid and evaluate to "d"?()A${map.c}B${map[c]}C${map[c]}D${map.map.b}E${map[map.b]}

单选题给定如下Java程序代码片段,编译运行这段代码,结果是()。 java.util.HashMap map=new java.util.HashMap(); map.put("name",null); map.put("name","Jack"); System.out.println(map.get("name"));AnullBJackCnullJackD运行时出现异常

单选题下面哪种是正确的创建Map集合的方式()。AMap m=new Map();BMap m=new Map(init capacity,increment capacity);CMap m=new Map(new Collection());DMap是接口,所以不能实例化。