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()
5 W# [; X: ^9 h$ z3 v' ?C. tan()
D. aSin()
E. Cos()
# K0 d, s" }* W. mF. aTan()
$ e4 j: D! N% n* FG. toDegree()
4 o% i- X) G6 ~% qABC.
9 ]8 I# H8 E3 @. y4 j8 d/ O5 Y172. This piece of code:
, i: P" b1 ~7 iTextArea ta = new TextArea ( 10, 3 );
Produces (select all correct statements):
A. a TextArea with 10 rows and up to 3 columns
B. 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- q, Q9 n6 c7 T- p1 LD. a TextArea that can be edited
/ w; D7 S; R# W/ j7 E  OAD.
173. In the list below, which subclass(es) of Component cannot be directly instantiated:
A. Panel
& l8 {2 a# r6 l: o1 Q3 IB. Dialog
C. Container
D. Frame
* j: J" C2 I, cC.
6 ?, b& l" a$ V174. Of the five Component methods listed below, only one is also a method of the class MenuItem. Which one?
$ a: p/ u, T* t, ?2 eA.setVisible (boolean b)
B.setEnabled (boolean b)
C.getSize ()
! h6 N; m9 j* `) k! @$ I* d( PD.setForeground (Color c)
E.setBackground (Color c)
B.
; M. z+ W1 R! K* Y  S* l175. If a font with variable width is used to construct the string text for a column, the initial size of the column is:
A. 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
" G  |* N, L/ D; K, C) {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.
8 v( O2 Y$ {8 @2 z4 K0 M6 {7 i, aA. fillRect()
B. drawRect()
; A9 r* c. P5 s' U3 x3 NC. fillPolygon()
6 X% @- w9 Y- j5 r% ]* ?D. drawPolygon()
E. drawLine()
BD.
- O9 O6 q6 i; w6 {0 p% a177. Of the following AWT classes, which one(s) are responsible for implementing the components layout? Select all.
8 z2 ^0 H3 z( d! \  r9 E  ]A. LayoutManager
$ J+ W: E; Z* `# X2 m% u+ tB. GridBagLayout
C. ActionListener
! T0 W# W) P& gD. WindowAdapter
: V& J$ i' f. j7 L! TE. FlowLayout
BE.
178. A component that should resize vertically but not horizontally should be placed in:
) ?* r; M$ }* i$ C: ]A. BorderLayout in the North or South location
B. FlowLayout as the first component
, D  E& ]4 P( O; Z& B5 Q. kC. BorderLayout in the East or West location
' m& P6 i8 ^2 R( ^( s* |* DD. BorderLayout in the Center location
4 d6 d" ]# N& Q" }E. GridLayout
C.
179. What type of object is the parameter for all methods of the MouseListener interface?
) a4 G5 e/ }: J, CAnswer:
" ]$ o; i" z; l; K9 c9 nMouseEvent
/ W1 ~, Q3 R; N180. What type of object is the parameter for all methods of the MouseMotionListener interface?
Answer:
MouseEvent
181. What type of object is the parameter for all methods of the KeyListener interface?
Answer:
: W0 h, i$ e# Q2 bKeyEvent