Java程序员认证模拟题及详细分析(3)

文章作者 100test 发表时间 2007:03:10 18:30:18
来源 100Test.Com百考试题网

续:Java程序员认证模拟题及分析(1) 和(2)
　　 51. Which correctly create an array of five empty Strings?
　　 A. String a[] = new String[5].
　　 for (int i=0.i<5.a[i ]=””).
　　 B. String a []={“”,””,””,””,””}.
　　 C. String a[5].
　　 D. String [5] a.
　　 E. String [] a = new String[5].
　　 for (int i = 0 .i<5.a[i ] = null).

　　 52. Which cannot be added to a Container?
　　 A. an Applet
　　 B. a Component
　　 C. a Container
　　 D. a MenuComponent
　　 E. a panel

　　 53. Which is the return value of Event listener?s method?
　　 A. String B. AWTEvent C. void D. int

　　 54. If we implements MouseListener, which is corrected argument of its method? (short answer)

　　 55. Use the operator “>>” and “>>>”. Which statement is true?
　　 A. 1010 0000 0000 0000 0000 0000 0000 0000 >> 4 give
　　 0000 1010 0000 0000 0000 0000 0000 0000
　　 B. 1010 0000 0000 0000 0000 0000 0000 0000 >> 4 give
　　 1111 1010 0000 0000 0000 0000 0000 0000
　　 C. 1010 0000 0000 0000 0000 0000 0000 0000 >>> 4 give
　　 0000 1010 0000 0000 0000 0000 0000 0000
　　 D. 1010 0000 0000 0000 0000 0000 0000 0000 >>> 4 give
　　 1111 1010 0000 0000 0000 0000 0000 0000

　　 56. Give following fragment.
　　 Outer: for(int i=0. i<3. i )
　　 inner:for(int j=0.j<3.j ){
　　 If(j>1)break outer.
　　 System.out.println(j ”and” i).
　　 }
　　 Which will be output?
　　 A. 0 and 0 B. 0 and 1 C. 0 and 2 D. 0 and 3
　　 E. 1 and 0 F. 1 and 1 G. 1 and 2 H. 1 and 3
　　 I. 2 and 0 J. 2 and 1 K. 2 and 2 L. 2 and 3

　　 57. Examine the following code which includes an inner class:
　　 public final class Test4 implements A{
　　 class Inner{
　　 void test(){
　　 if (Test4.this.flag).{
　　 sample().
　　 }
　　 }
　　 private boolean flag=false.
　　 }
　　 public void sample(){
　　 System.out.println(“Sample”).
　　 }
　　 public Test4(){
　　 (new Inner()).test().
　　 }
　　 public static void main(String args[]){
　　 new Test4().
　　 }
　　 }
　　 What is the result:
　　 A.Print out “Sample”
　　 B.Program produces no output but termiantes correctly.
　　 C. Program does not terminate.
　　 D.The program will not compile

　　 58. What is written to the standard output given the following statement:
　　 System.out.println(4|7).
　　 Select the right answer:
　　 A.4
　　 B.5
　　 C.6
　　 D.7
　　 E.0

　　 59. Look the inheritance relation:
　　 person
|
----------------
| |
man woman
　　 In a source of java have the following line:
　　 person p=new man().
　　 What statement are corrected?
　　 A. The expression is illegal.
　　 B. Compile corrected but running wrong.
　　 C. The expression is legal.
　　 D. Will construct a person?s object.
　　 60. Look the inheritance relation:
　　 person
|
----------------
| |
man woman
　　 In a source of java have the following line:
　　 woman w=new man():

　　 What statement are corrected?
　　 A. The expression is illegal.
　　 B. Compile corrected but running wrong.
　　 C. The expression is legal.
　　 D. Will construct a woman object.