JAVA认证历年真题：310-025精选题（40）

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171. Which methods does java.lang.Math include for trigonometric computations? A. sin()
B. cos()
C. tan()
D. aSin()
7 `+ R- P7 ]! \# U& c! wE. Cos()
F. aTan()
0 @: P  e# G9 {: rG. toDegree()
ABC.
172. This piece of code:
TextArea ta = new TextArea ( 10, 3 );
Produces (select all correct statements):
A. a TextArea with 10 rows and up to 3 columns
5 ]0 p: ?: E: U0 l  k0 KB. a TextArea with a variable number of columns not less than 10 and 3 rows
C. a TextArea that may not contain more than 30 characters
D. a TextArea that can be edited
+ ?5 m% t2 `* g6 h; ]AD.
- H) Z; c) f0 N) x, q4 A173. In the list below, which subclass(es) of Component cannot be directly instantiated:
A. Panel
6 H0 y( c' [8 @9 M- u1 R. {B. Dialog
C. Container
# U4 b8 K+ L1 z8 C7 ND. Frame
% P; `6 u7 H- J+ d$ _/ k" iC.
174. Of the five Component methods listed below, only one is also a method of the class MenuItem. Which one?
A.setVisible (boolean b)
B.setEnabled (boolean b)
8 |# ]+ v" o# W4 s& a: mC.getSize ()
$ O& U7 N6 v# }6 y+ tD.setForeground (Color c)
- x" A6 \6 d0 |9 ~" e5 P+ P7 Q: ]E.setBackground (Color c)
4 z6 f  w$ S6 m- F) U8 uB.
5 U. j6 S5 h2 P0 Z175. If a font with variable width is used to construct the string text for a column, the initial size of the column is:
. y2 t2 i! g6 ?0 r2 SA. determined by the number of characters in the string, multiplied by the width of a character in this font
B. determined by the number of characters in the string, multiplied by the average width of a character in this font
C. exclusively determined by the number of characters in the string
D. undetermined
B.

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176. Which of the following methods from the java.awt.Graphics class could be used to draw the outline of a rectangle with a single method call? Select all.
, w* ~$ J  f: }; P# pA. fillRect()
- C* J8 w7 j2 Z) ^6 z8 NB. drawRect()
C. fillPolygon()
D. drawPolygon()
1 k2 |3 u9 I& R9 y* LE. drawLine()
6 L; B6 h# M# S9 \BD.
177. Of the following AWT classes, which one(s) are responsible for implementing the components layout? Select all.
A. LayoutManager
+ q5 s* J3 I! w( TB. GridBagLayout
C. ActionListener
D. WindowAdapter
3 F% o3 ?( j0 [E. FlowLayout
BE.
178. A component that should resize vertically but not horizontally should be placed in:
A. BorderLayout in the North or South location
. ^9 G4 a  X' [8 nB. FlowLayout as the first component
& \1 ~# i7 Y& z0 S7 [( gC. BorderLayout in the East or West location
D. BorderLayout in the Center location
E. GridLayout
0 b- W8 J# F$ {  }- cC.
179. What type of object is the parameter for all methods of the MouseListener interface?
Answer:
MouseEvent
/ G4 Y# l& a2 U180. What type of object is the parameter for all methods of the MouseMotionListener interface?
Answer:
MouseEvent
1 H# u% ~+ s+ @8 z' z' o( N181. What type of object is the parameter for all methods of the KeyListener interface?
Answer:
" I8 H% R( k0 w, @: b: vKeyEvent