2011年JAVA认证模拟题第二阶段（22）

会计考友

　　Q64.Given the following code for the Demo class
　　1. public class Demo {
　　2. private String [] userNames;
' V# ~- H4 l" N7 q9 f　　3. public Demo() {
& y3 J4 B5 l* @' o! _8 g2 f6 P　　4. userNames = new String[10];
% N$ k/ o2 X# {9 ~) B; Z; `: c　　5. ｝
4 q; I- \$ ^0 B: f* c8 X　　6. public void showName(int n) {
' O4 ?: A7 l& E3 K1 o( c　　7. System.out.println(“Name is “ + userNames[n]);
　　8. ｝
　　9.
　　10. public String getName(int n) {
# u/ u- Y, E, J　　11. return(userNames[n]);
: J1 X9 j( c. Z- ~9 Y" Z# t* L　　12. ｝
　　13. ｝
  b6 `. V- L( H) Z0 R　　What would be the result of calling the showName method with a parameter of 2 immediately after creating an instance of Demo
　　a. Standard output would show “Name is null”.
9 @9 v% Z/ V. l! h. i　　b. A NullPointerException would be thrown, halting the program.
　　c. An ArrayIndexOutOfBoundsException would be thrown halting the program.
& P  L7 }' A. t1 f" i. ?　　d. Standard output would show “Name is”.
　　Q65.What will be the result of attempting to compile and run the following class?
! z4 ]+ q3 v9 n" N" B( t" v# I　　1. public class Integers {
  f4 F) L! z9 R6 h6 Q　　2. public static void main(String args[]
         ) {

　　3. System.out.printl(0x10 + 10 + 010);

　　4. ｝

会计考友

</p>　　5. ｝
/ O( E9 ~- V) a. m# b" h　　Select the one right answer.
; `2 ^% b3 d; l　　a. The code won't compile. The compiler will complain about the expression 0x10 + 10 + 010
　　b. When run, the program will print “28”
9 r2 G. t: h, E* b0 c, q& D7 n( I　　c. When run, the program will print “34”
+ s+ M7 V4 h- R8 _2 `　　d. When run, the program will print “36”
+ q- L/ h' G7 }; x# j　　Q66.How will the following program lay out its buttons?
　　1. import java.awt.*;
　　2. public class MyClass {
2 D/ }: u1 I- M. K5 ~　　3. public static void main(String args[]) {
　　4. String labels[] = {”A”,”B”,”C”,”D”,”E”,”F”｝;
. U/ M9 e# \& {# V# ]  w" [/ D! n　　5. Window grid = new Frame();
　　6. grid.setLayout(new GridLayout(0,1,2,3));
0 A3 i" e& ^! L; x$ O9 Q1 `4 H) g4 e　　7. for(int i=0;i
　　8. grid.add(new Button(labels));
7 W4 N, t; {2 N9 I　　9. ｝
　　10. grid.pack();
　　11. grid.setVisible(true);
　　12. ｝
　　Select the one right answer
1 e  I# r& T/ `+ v, {9 W　　a. The program will not show any buttons at all.
  F1 [' ?; f$ W0 L　　b. It will place all buttons in one row - A B C D E F.
$ ]% n) {2 b5 n" h/ L( p6 N1 N　　c. It will place all buttons in one column, i.e., each button in a separate row - A B C D E and F.
9 B* V, n# l& Y& K- ~
' T  b. R' x/ k3 x* F! n6 X" j　　d. It will place pairs of buttons in three separate row A B, C D and E F.
　　64. a
　　65. c
　　66. c