分布式架構(gòu)第十四單元試題及答案

分布式架構(gòu)第十四單元試題及答案ArrayList[單選題]數(shù)組結(jié)構(gòu)數(shù)組結(jié)構(gòu)(正確答案)鏈表結(jié)構(gòu)哈希表結(jié)構(gòu)紅黑樹(shù)結(jié)構(gòu)LinkedList[單選題]查詢快查詢快增刪快(正確答案)元素不重復(fù)元素自然排序Vector[單選題]線程同步線程同步(正確答案)線程不同步增刪快底層是鏈表結(jié)構(gòu)[單選題]迭代器是取出集合元素的方式迭代器是取出集合元素的方式迭代器的hasNext()方法返回值是布爾類型List集合有特有迭代器next()方法將返回集合中的上一個(gè)元素.(正確答案)[]RunnableRunnable接口Iterator接口Serializable接口Comparator接口(正確答案)給定下列代碼：publicvoidtest(){tryoneMethod();System.out.println(“condition1”)}catch(ArrayIndexOutOfBoundsExceptione){System.out.println(“condition2”)}catch(Exceptione){System.out.println(“condition3”)}finally{System.out.println(“finally”)}}oneMethod正常運(yùn)行[單選題]condition1condition1和finally(正確答案)condition2和condition1condition3和finally全部顯示下面代碼運(yùn)行的結(jié)果是ArrayList<String>al=newArrayList<String>()al.add(true)al.add(123)al.add(“abc”)System.out.println(al)[單選題]編譯失敗編譯失敗(正確答案)[true,123][true,123,abc][abc]ArrayListVector[單選題]ArrayListArrayList是線程安全的，Vector是線程不安全ArrayList是線程不安全的，Vector是線程安全的(正確答案)ArrayList底層是數(shù)組結(jié)構(gòu)，Vector底層是鏈表結(jié)構(gòu)ArrayListArrayList底層是鏈表結(jié)構(gòu)，Vector底層是數(shù)組結(jié)構(gòu)HashMap[單選題]底層是數(shù)組結(jié)構(gòu)底層是鏈表結(jié)構(gòu)底層是數(shù)組結(jié)構(gòu)底層是鏈表結(jié)構(gòu)可以存儲(chǔ)null值和null鍵(正確答案)不可以存儲(chǔ)null值和null鍵第一行會(huì)產(chǎn)生編譯錯(cuò)誤第六行會(huì)產(chǎn)生編譯錯(cuò)誤第六行會(huì)產(chǎn)生運(yùn)行錯(cuò)誤程序會(huì)運(yùn)行和啟動(dòng)(正確答案)閱讀以下代碼：publicclassXextendsThreadimplementsRunnable{publicvoidrun(){System.out.println(“thisisrun()”)}publicstaticvoidmain(Stringargs[]){Threadt=newThread(newX());t.start();}}第一行會(huì)產(chǎn)生編譯錯(cuò)誤第六行會(huì)產(chǎn)生編譯錯(cuò)誤第六行會(huì)產(chǎn)生運(yùn)行錯(cuò)誤程序會(huì)運(yùn)行和啟動(dòng)(正確答案)[單選題]java.util.Collectionsjava.util.Collections(正確答案)java.util.Mapjava.util.Vectorjava.util.HashtableLinux[單選題]ipconfigiptablesiptableipconfigiptablesiptableifconfig(正確答案)以下能以鍵_[單選題]java.util.Collectionsjava.util.Mapjava.util.Collectionsjava.util.Map(正確答案)java.util.HashMapjava.util.Set在Java中，( 類可用于創(chuàng)建鏈表數(shù)據(jù)結(jié)構(gòu)的對(duì)象。[單選題]LinkedListLinkedList(正確答案)ArrayListCollectionHashMapPersonArrayList輸每個(gè)Person對(duì)象的idCard和userName。()publicclassPerson{ privateLongidCard; pirvateStringuserName; //以下是getter和setter方法 //省略}List<Person>list=newArrayList<>();Personp1=newPerson();p1.setIdCard(newLong(1001))p1.setUserName(“terry”) Personp2=newPerson();p2.setIdCard(newLong(1002))p2.setUserName(“tom”)list.add(p1);list.add(p2);for(位置){ System.out.println(person.getIdCard()+”:”+person.getUserName())}那么位置①處的代碼為[單選題]Listlist:personListlist:PersonPersonperson:ListListlist:personListlist:PersonPersonperson:ListPersonperson:list(正確答案)[單選題]asList()asList()toCharArray()toArray()toCharArray()toArray()(正確答案)copy()TreeSet[單選題]實(shí)現(xiàn)實(shí)現(xiàn)Comparable接口(正確答案)有main方法有g(shù)et和set方法實(shí)現(xiàn)Serializable接口add(Objecto)add(intindexObjecto)remove(Objecto)removeLast()(正確答案)JAVA中，LinkedListArrayList類同屬于集合框架類，下列（）LinkedListArrayListadd(Objecto)add(intindexObjecto)remove(Objecto)removeLast()(正確答案)JAVAArrayList類實(shí)現(xiàn)了可變大小的數(shù)組，便于遍歷元素和隨機(jī)訪問(wèn)元ArrayListbookTypeList表中是否存在字符串“小說(shuō)”[單選題]bookTypeList.add("bookTypeList.add("小說(shuō)");bookTypeList.get("小說(shuō)");bookTypeList.contains("小說(shuō)");(正確答案)bookTypeList.remove("小說(shuō)");CollectionCollections[單選題]CollectionsCollections是集合頂層接口CollectionCollection是針對(duì)Collections集合操作的工具類List、Set、Map都繼承自Collection接口Collections是針對(duì)Collection集合操作的工具類(正確答案)jsp中注釋的有<%--<%--與--%>(正確答案)//**與**/<!--與-->(正確答案)按照學(xué)生平均成績(jī)(avg_grade)studentsSQL語(yǔ)句正確的是SELECT*FROMstudentsORDERBYavg_gradeSELECT*FROMstudentsORDERBYavg_grade(正確答案)SELECT*FROMstudentsGROUPBYavg_gradeASCSELECT*FROMstudentsORDERBYavg_gradeDESC(正確答案)SELECT*FROMstudentsORDERbyavg_gradeasc(正確答案)jsp作用域的通信對(duì)象的有SessionSession(正確答案)application(正確答案)pageContext(正確答案)cookie在接口中以下哪條定義是正確的voidmethoda();voidmethoda();(正確答案)publicdoublemethoda();(正確答案)staticvoidmethoda(doubled1);protectedvoidmethoda(doubled1);protectedvoidmethoda(doubled1);下面哪個(gè)語(yǔ)句正確地聲明一個(gè)整型的二維數(shù)組int a[][] = new int[][]int a[][] = new int[][]；int a[10][10] = new int[][]；int a[][] = new int[10][10]；(正確答案)int [][]a = new int[10][10]；(正確答案)java的簡(jiǎn)單數(shù)據(jù)類型shortshortBoolean(正確答案Double(正確答案)float5個(gè)空字符串String a[]=new String[5]String a[]=new String[5]；for(int 正確答案)String a[]={“”，“”，“”，“”，“”}；(正確答案)String[5]a；String a[5]；關(guān)于數(shù)組下列說(shuō)法錯(cuò)誤的有數(shù)組是一種對(duì)象數(shù)組是一種對(duì)象數(shù)組屬于一種原生類(正確答案)intnumber=[]={31,23,33,43,35,63}(正確答案)數(shù)組的大小可以任意改變(正確答案)interface的有privateprivate(正確答案)publicdoublemethoda();protectedpublicdoublemethoda();protected(正確答案)static(正確答案)CAP定理的意思是？CC