2011年JAVA认证模拟题（16）

会计考友

Q46 Which are true about the Container class? 　　A The validate() method is used to cause a Container to be laid out and redisplayed.
. r! M; k2 x8 x7 J  r7 }6 M- c　　B The add() method is used to add a Component to a Container.
* d6 C! L( `  J- o　　C The getBorder() method returns information about a container’s insets.
- F+ ~8 A3 F( w* s  _　　D The getComponent() method is used to access a Component that is contained in
: _! N- r/ M  j- N/ A0 ^! {4 _　　a Container.
　　Q47 What is wrong with the following statement?
　　while (x >>2) do {
　　x *=y;
　　｝

会计考友

</p>　　A The loop expression is not a boolean expression.
　　B The do should be removed.
* ]% K" p5 [  c　　C The while should be capitalized.
0 H3 c+ M. A3 E& l9 I　　D There is nothing wrong with this statement.
: t" i. W+ U( h3 `: |2 G9 l/ p　　Q48 What can contain objects that have a uniQue key field of String type, if it is reQuired to retrieve the objects using that key field as an index?
/ c( C! w$ R5 B　　A Map
4 d* R* a# ^3 _2 }. j4 C　　B Set
: t2 K# w  d1 q8 \. [　　C List
　　D Collection
* {1 L2 z& O. F5 w0 x, F- ?) r6 W　　E Enumeration
2 p3 H3 |( G, q5 Y" ?3 B　　Q046 ABD
　　Q047 AB
　　Q048 A