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.
7 \! ~/ k  k- F1 B8 r8 g　　B The add() method is used to add a Component to a Container.
( w6 ]. Z7 k+ ~2 B( t1 K　　C The getBorder() method returns information about a container’s insets.
( _" L$ p: J$ J2 e　　D The getComponent() method is used to access a Component that is contained in
$ M- g  E7 [6 D4 ]2 e2 j　　a Container.
　　Q47 What is wrong with the following statement?
　　while (x >>2) do {
$ I" Y* g; Y2 ], V) S　　x *=y;
5 j( C1 k/ c+ o1 n5 P　　｝

会计考友

</p>　　A The loop expression is not a boolean expression.
- L/ n' f6 M. \$ e　　B The do should be removed.
0 i9 C( ]; L; X7 b　　C The while should be capitalized.
) j8 ]7 t5 O& d; M% E( N- X: R　　D There is nothing wrong with this statement.
　　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?
　　A Map
) A8 K8 _5 o4 ?3 j/ }　　B Set
　　C List
* T! X3 W0 Q" b) E5 v　　D Collection
5 S3 N- g. }% H/ Y　　E Enumeration
3 m/ }5 j. Q) [　　Q046 ABD
4 k0 ~5 f! O0 G0 [" Q% q" E　　Q047 AB
　　Q048 A