Collection 和 Collections 的区别。
Collection 和 Collections 的区别。
相关考题：
Collection和Collections正确的说法有() A.Collections是个java.util包下的接口B.Collection是个java.util包下的类C.Collections包含有各种有关集合操作的静态方法D.Collection是各种集合结构的父接口
听力原文：Our company will apply for a sight letter of credit for settlement instead of documentary collection.(10)A．Our company prefers an L/C to collection.B．Our company will apply for documentary collection.C．Our company will apply for either documentary collection or sight letter of credit according to your advice.D．Our company will adopt neither documentary collection nor letter of credit.
听力原文：In dealing with collections, banks will do nothing but follow the collection order.(9)A．In dealing with collections, banks will do nothing to follow the collection order.B．Banks will do something in dealing with the collection order.C．Banks should strictly follow the instructions in the collection order.D．In dealing with collections, the bank is usually useless.
Given:ArrayLista=newArrayList();containingthevalues{1”,2”,3”,4”,5”,6”,7”,8”}Whichcodewillreturn2?() A.Collections.sort（a，a.reverse（））；intresult=Collections.binarySearch（a，“6”）；B.Comparatorc=Collections.reverseOrder（）；Collections.sort（a，c）；intresult= Collections.binarySearch（a，“6”）；C.Comparatorc=Collections.reverseOrder（）；Collections.sort（a，c）；intresult=Collections.binarySearch（a，“6”，c）；D.Comparatorc=Collections.reverseOrder（a）；Collections.sort（a，c）；intresult=Collections.binarySearch（a，“6”，c）；E.Comparatorc=newInverseComparator（newComparator（））；Collections.sort（a）；intresult=Collections.binarySearch（a，“6”，c）；
Listlist=／／morecodehere12.Collections.sort(list,newMyComparator());Whichcodewillsortthislistintheoppositeorderofthesortinline12?() A.Collections.reverseSort（list，newMyComparator（））；B.Collections.sort（list，newMyComparator（））；list.reverse（）；C.Collections.sort（list，newInverseComparator（newMyComparator（）））；D.Collections.sort（list，Collections.reverseOrder（newMyComparator（）））；
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Collection 和 Collections正确的说法有（） A、Collections是个java.util包下的接口B、Collection是个java.util包下的类C、Collections包含有各种有关集合操作的静态方法D、Collection是各种集合结构的父接口
Collection和Collections正确的说法有（） A、Collections是个java.util包下的接口B、Collection是java.util包下的类C、Collections包含有各种有关集合操作的静态方法D、Collection是各种集合结构的父接口
11. List list = // more code here 12. Collections.sort（list， new MyComparator（））； Which code will sort this list in the opposite order of the sort in line 12？（） A、 Collections.reverseSort（list， new MyComparator（））；B、 Collections.sort（list， new MyComparator（））； list.reverse（）；C、 Collections.sort（list， new InverseComparator（ new MyComparator（）））；D、 Collections.sort（list， Collections.reverseOrder（ new MyComparator（）））；
Which statement is true about XpauseTarget in Oracle JRockit JVM ？ （）A、 This option is supported by all type of Garbage collection modes.B、 This option is only supported by Generational Garbage Collection mode.C、 This option is only supported by Mark and Sweep Garbage Collection mode.D、 This option is only supported by Dynamic Garbage Collection mode.
Which statement is true for the class java.util.ArrayList？（） A、 The elements in the collection are ordered.B、 The collection is guaranteed to be immutable.C、 The elements in the collection are guaranteed to be unique.D、 The elements in the collection are accessed using a unique key.E、 The elements in the collections are guaranteed to be synchronized.
Which statements about the garbage collection are true？（） A、 The program developer must create a thread to be responsible for free the memory.B、 The garbage collection will check for and free memory no longer needed.C、 The garbage collection allow the program developer to explicity and immediately free the memory.D、 The garbage collection can free the memory used java object at expect time.
Given： ArrayList a = new ArrayList（）； containing the values {“1”， “2”， “3”， “4”， “5”， “6”， “7”， “8”} Which code will return 2？（） A、 Collections. sort（a， a.reverse（））； int result = Collections.binarySearch（a， “6”）；B、 Comparator c = Collections.reverseOrder（）； Collections.sort（a， c）； int result = Collections.binarySearch（a， “6”）；C、 Comparator c = Collections.reverseOrder（）； Collections.sort（a， c）； int result = Collections.binarySearch（a， “6”，c）；D、 Comparator c = Collections.reverseOrder（a）； Collections.sort（a， c）； int result = Collections.binarySearch（a， “6”，c）；E、 Comparator c = new InverseComparator（new Comparator（））； Collections.sort（a）； int result = Collections.binarySearch（a， “6”，c）；
Which of these statements concerning the collection interfaces are true？（） A、Set extends Collection.B、All methods defined in Set are also defined in Collection.C、List extends Collection.D、All methods defined in List are also defined in Collection.E、Map extends Collection.
class A { } class Alpha { private A myA = new A（）； void dolt（ A a ） { a = null； } void tryIt（） { dolt（ myA ）； } } Which two statements are correct？（） A、 There are no instanced of A that will become eligible for garbage collection.B、 Explicitly setting myA to null marks that instance to be eligible for garbage collection.C、 Any call on tryIt（） causes the private instance of A to be marked for garbage collection.D、 Private instances of A become eligible for garbage collection when instances of Alpha become eligible for garbage collection.
您正在开发.NET Framework2.0应用程序用于存储类型安全列表中的姓名和电子邮件地址。列表中将填充所有在那些从排序的数据，这意味着您不总是需要执行插入或删除对数据的操作。您需要选择一种数据结构，优化内存使用，并且具有良好的性能。你应该做什么？（）A、应使用 System.Collections.Generic.SortedList 类B、应使用 System.Collections.HashTable 类C、应使用 System.Collections.Generic.SortedDictionary 类D、应使用 System.Collections.SortedList 类
多选题Which of these statements concerning the collection interfaces are true？（）ASet extends Collection.BAll methods defined in Set are also defined in Collection.CList extends Collection.DAll methods defined in List are also defined in Collection.EMap extends Collection.
多选题Collection和Collections正确的说法有（）ACollections是个java.util包下的接口BCollection是java.util包下的类CCollections包含有各种有关集合操作的静态方法DCollection是各种集合结构的父接口
多选题Collection 和 Collections正确的说法有（）ACollections是个java.util包下的接口BCollection是个java.util包下的类CCollections包含有各种有关集合操作的静态方法DCollection是各种集合结构的父接口
单选题Which statement is true for the class java.util.ArrayList？（）A The elements in the collection are ordered.B The collection is guaranteed to be immutable.C The elements in the collection are guaranteed to be unique.D The elements in the collection are accessed using a unique key.E The elements in the collections are guaranteed to be synchronized.
单选题11. List list = // more code here 12. Collections.sort（list， new MyComparator（））； Which code will sort this list in the opposite order of the sort in line 12？（）A Collections.reverseSort（list， new MyComparator（））；B Collections.sort（list， new MyComparator（））； list.reverse（）；C Collections.sort（list， new InverseComparator（ new MyComparator（）））；D Collections.sort（list， Collections.reverseOrder（ new MyComparator（）））；