题目内容

程序代码如下，请问会输出什么结果？__________________。import java.util.*;class Excute3{public static void main(String[] args){LinkedList list =new LinkedList();list.add("One");list.add("Two");list.add("Three");list.add("Four");System.out.print(list.peek()+" ");System.out.println(list.poll());}}

A. One Two
B. Two Two
C. Two One
D. One One

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程序代码如下，请问会输出什么结果？_________________。import java.util.*;class Excute4{public static void main(String[] args){Stack stack =new Stack();stack.add("One");stack.add("Two");stack.add("Three");stack.add("Four");System.out.print(stack.pop()+" ");System.out.println(stack.peek());}}

A. One Two
B. Two One
C. Two Three
D. Three Two
E. Four Three
F. Three Four

程序代码如下，请问会输出什么结果？_________________。import java.util.*;class Excute5{public static void main(String[] args){TreeMap map =new TreeMap();map.put("001","One");map.put("002","Two");map.put("003","Three");map.put("001","Four");Set keys=map.keySet();System.out.println("键的数目是："+keys.size());}}

A. 编译失败
B. 执行失败
C. 键的数目是4
D. 键的数目是3

当编译运行下列程序时，会出现什么结果_________________。import java.util.*;class Excute6{public static void mA(List list){list.add(Double.toString(8.1));System.out.println(list.get(1));}public static void main(String[] args){ArrayList list =new ArrayList();list.add("Hello One");mA(list);}}

A. Hello One
B. 第3行编译出错
C. 第4行编译出错
D. 第10行编译出错
E. 8.1
F. 执行失败

当编译运行下列程序时，会出现什么结果_________________。import java.util.;class Excute7{static int sumUp(List list){int sum=0;for(Iterator iter=list.iterator();iter.hasNext();)sum+=(int)iter.next();return sum;}public static void main(String[] args){ArrayList list =new ArrayList();for(int k=1;k<11;k=k2+1) list.add(k);System.out.println(sumUp(list));}}

A. 11
B. 15
C. 55
D. 10