题目内容

假设线性表list1=[1,2,5]和list2=[2,3,6].代码list1.addAll(list2)执行后,list2是__________.

A. [1,2,2,3,5,6]
B. [1,2,3,5,6]
C. [1,5]
D. [2]
E. [2,3,6]

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假设一个线性表包含元素{"red","green","red","green"}.下列代码执行后,线性表是______________?Stringelement="red";for(inti=list.size()-1;i>=0;i--)if(list.get(i).equals(element))list.remove(element);

A. {"red","red","green"}
B. {"red","green"}
C. {"green","green"}
D. {"green"}
E. {}

以下__________数据类型不实现Collection接口?

A. HashSet
B. TreeSet
C. ArrayList
D. LinkedList
E. Map

实现两个集合s1和s2的集合差集,以下____________是正确的?

A. s1.difference(s2)
B. s1-s2
C. s1.subtract(s2)
D. s1.removeAll(s2)

要清空集合或映射表,请使用__________方法。

A. empty
B. clear
C. zero
D. setEmpty