考题
欲构造ArrayList类的一个实例,此类继承了List接口,下列哪个方法是正确的?( B )
A.ArrayList myList=new Object();B.List myList=new ArrayList();C.ArrayList myList=new List();D.List myList=new List();
考题
欲构造ArrayList类的一个实例,此类实现List接口,下列方法正确的是______。A.ArrayList myList=new Object( );B.List myList=new ArrayList( );C.ArrayList myList=new List( );D.List myList=new List( );
考题
欲构造ArrayList类的一个实例,此类继承了List接口,下列( )方法是正确的。A.ArrayList myList=new Object();B.List myList=new ArrayList();C.ArrayList myList=new List();D.List myList=new List();
考题
下列数组a中,版本较新的能在程序运行时动态调整大小的是A.int a[]B.String []aC.a=new ArrayList()D.a=new Array()
考题
YouarewritingaJSPthatincludesscriptletcodetodeclareaListvariableandinitializesthatvariabletoanArrayListobject.WhichtwoJSPcodesnippetscanyouusetoimporttheselisttypes?()
A.%!importjava.util.*;%B.%!importjava.util.List;importjava.util.ArrayList;%C.%@pageimport=’java.util.List’import=’java.util.ArrayList’%D.%@importtypes=’java.util.List’types=’java.util.ArrayList’%E.%@pageimport=’java.util.List,java.util.ArrayList’%F.%@importtypes=’java.util.List,java.util.ArrayList’%
考题
11.public void genNumbers(){12.ArrayList numbers=new ArrayList();13.for(inti=0;i14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()A.Line16B.Line17C.Line18D.Line19E.The object is NOT a candidate for garbage collection.
考题
下列数组array_test中,能在程序运行时动态调整大小的是A.int array_test []=new int[10]B.String[] array_testC.ArrayList array_test=new ArrayList()D.Array array_test=new Array()
考题
欲构造ArrayList类的一个实例,此类继承了List接口,下列( )是正确的。A.ArrayListmyList=new Object();B.List myList=new ArrayList();C.ArrayList myList=new List();D.List myList=new List();
考题
Given: int[] myArray=newint[] {1, 2,3,4, 5}; What allows you to create a list from this array?() A、 List myList = myArray.asList();B、 List myList = Arrays.asList(myArray);C、 List myList = new ArrayList(myArray);D、 List myList = Collections.fromArray(myArray);
考题
11.public void genNumbers(){ 12.ArrayList numbers=new ArrayList(); 13.for(inti=0;i10;i++){ 14.intvalue=i*((int)Math.random()); 15.IntegerintObj=newInteger(value); 16.numbers.add(intObj); 17.} 18.System.out.println(numbers); 19.} Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()A、Line16B、Line17C、Line18D、Line19E、The object is NOT a candidate for garbage collection.
考题
Vector和ArrayList的主要区别是()A、ArrayList内部基于链表,而Vector是基于数组的B、Vector的大部分方法做了同步,而ArrayList没有同步C、Vector是可串行化的,而ArrayList不是D、Vector实现了RandomAccess,而ArrayList没有
考题
You are writing a JSP that includes scriptlet code to declare a List variable and initializes that variable to anArrayList object. Which two JSP code snippets can you use to import these list types?()A、%! import java.util.*; %B、%! import java.util.List;import java.util.ArrayList; %C、%@ page import=’java.util.List’import=’java.util.ArrayList’ %D、%@ import types=’java.util.List’types=’java.util.ArrayList’ %E、%@ page import=’java.util.List,java.util.ArrayList’ %F、%@ import types=’java.util.List,java.util.ArrayList’ %
考题
Vector 与 ArrayList正确的是:()A、 ArrayList 出现比Vector早B、 ArrayList 速度比Vector慢C、 ArrayList 没有同步保护,Vector具有同步保护D、 ArrayList Vector 两者都是无序的集合"
考题
创建一个ArrayList集合实例,该集合中只能存放String类型数据,下列()代码是正确的A、ArrayList myList=new ArrayList()B、ArrayListStringmyList=new ArrayList;()C、ArrayListmyList=new ArrayListString()D、ArrayListmyList=new List()
考题
欲构造ArrayList类的一个实例,此类继承了List接口,下列哪个方法是正确的?()A、 ArrayList myList=new Object();B、 List myList=new ArrayList();C、 ArrayList myList=new List();D、 List myList=new List();
考题
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();
考题
单选题11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()A
Line 16B
Line 17C
Line 18D
Line 19E
The object is NOT a candidate for garbage collection.
考题
单选题创建一个ArrayList集合实例,该集合中只能存放String类型数据,下列()代码是正确的A
ArrayList myList=new ArrayList()B
ArrayListStringmyList=new ArrayList;()C
ArrayListmyList=new ArrayListString()D
ArrayListmyList=new List()
考题
单选题Given: int[] myArray=newint[] {1, 2,3,4, 5}; What allows you to create a list from this array?()A
List myList = myArray.asList();B
List myList = Arrays.asList(myArray);C
List myList = new ArrayList(myArray);D
List myList = Collections.fromArray(myArray);
考题
单选题Given: 11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()A
Line 19B
The object is NOT a candidate for garbage collection.C
Line 17D
Line 16E
Line 18
考题
单选题1. import java.util.*; 2. class SubGen { 3. public static void main(String [] args) { 4. //insert code here 5. } 6. } class Alpha { } class Beta extends Alpha { } class Gamma extends Beta { } 和四段代码片段: s1. ArrayList〈? extends Alpha〉 list1 = new ArrayList〈Gamma〉(); s2. ArrayList〈Alpha〉 list2 = new ArrayList〈? extends Alpha〉(); s3. ArrayList〈? extends Alpha〉 list3 = new ArrayList〈? extends Beta〉(); s4. ArrayList〈? extends Beta〉 list4 = new ArrayList〈Gamma〉(); ArrayList〈? extends Alpha〉 list5 = list4; 哪些片段分别插入到第4行,可允许代码编译?()A
只有s1B
只有s3C
只有s1和s3D
只有s1和s4
考题
多选题You are writing a JSP that includes scriptlet code to declare a List variable and initializes that variable to anArrayList object. Which two JSP code snippets can you use to import these list types?()A%! import java.util.*; %B%! import java.util.List;import java.util.ArrayList; %C%@ page import=’java.util.List’import=’java.util.ArrayList’ %D%@ import types=’java.util.List’types=’java.util.ArrayList’ %E%@ page import=’java.util.List,java.util.ArrayList’ %F%@ import types=’java.util.List,java.util.ArrayList’ %
考题
单选题Vector和ArrayList的主要区别是()A
ArrayList内部基于链表,而Vector是基于数组的B
Vector的大部分方法做了同步,而ArrayList没有同步C
Vector是可串行化的,而ArrayList不是D
Vector实现了RandomAccess,而ArrayList没有
考题
单选题11.public void genNumbers(){ 12.ArrayList numbers=new ArrayList(); 13.for(inti=0;i10;i++){ 14.intvalue=i*((int)Math.random()); 15.IntegerintObj=newInteger(value); 16.numbers.add(intObj); 17.} 18.System.out.println(numbers); 19.} Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()A
Line16B
Line17C
Line18D
Line19E
The object is NOT a candidate for garbage collection.
考题
单选题欲构造ArrayList类的一个实例,此类继承了List接口,下列哪个方法是正确的?()A
ArrayList myList=new Object();B
List myList=new ArrayList();C
ArrayList myList=new List();D
List myList=new List();
考题
单选题Vector 与 ArrayList正确的是:()A
ArrayList 出现比Vector早B
ArrayList 速度比Vector慢C
ArrayList 没有同步保护,Vector具有同步保护D
ArrayList Vector 两者都是无序的集合