Question

java 几个基础笔试题,高手帮忙. 最好说一下选择答案的原因。

11. public class MyOuter{
public static class MyInner{
public static void foo(){}
}
}
which statement, if placed in a class other than MyOuter or MyInner, instantiates an of the nested class?
A. MyOuter.MyInner mi = me MyInner();
B. MyOuter m = new MyOuter();
C. MyOuter.MyInner mi = m.new MyOuter.MyInner();
D. MyInner mi = new MyOuter.MyInner();
E. MyOuter.MyInner m =new MyOuter.MyInner();

13. Java threads in the four states are()
A. run B. hangs C. interrupt D. destruction E. ready F. end

16. Which methods are belonging to Request object?
A. getContentLength
B. getHeader
C. getRequestURI
D. getRemoteHost
E. AddHeader
F. sendRedirect
17. which methods are belonging to Class object?
A. forName B.getClassLoader C. getDeclaredFields D. toString

18. which are thesub interface of Collection.
A. List B. Map C. Set D. Queue E. Vector F. ArrayList

Answer 1

11、 E
13、A B E F
线程的四种状态：运行（run）,挂起（hangs）,准备（ready）,死亡(end)
16、C
17、A B C D
18、A C D
Map不是集合，Vector是实现类不是接口，ArrayList是List的实现，不是接口

Answer 2

11、D 实例化一个静态内部类，MyInner mi = new MyOuter.MyInner();
MyOuter.MyInner = new MyOuter.MyInner();
MyOuter.MyInner = new MyInner();均正确执行
13、线程四态ABCE
16、Request类包含的方法，BCD 其中最后两个是response的方法，第一个应该是HttpURLConnection的
17、Class类包含的方法 ABCD
18、Collection的子接口 ACD
纯手打，能用就结了吧~

Answer 3

E. MyOuter.MyInner m =new MyOuter.MyInner();

创建内部类
A. run
线程用什么方法启动
A. forName
得到类名
最后个thesub看不明白

Answer 4

学习中。。

Answer 5

路过