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<td height="50" align="center" style="border-bottom:1px
dashed #666666"><strong class="f16">Java程序员认证模拟题及详细分析(4)</strong></td>
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<td height="40" align="center"> 作者：unknown 更新时间：
2005-03-22 </td>
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<span class="header">续：Java程序员认证模拟题及详细分析(1) 和(2) (3)</span><br>
66． Given the following class outline: <br>
class Example{ <br>
private int x; <br>
// rest of class body <br>
public static void main(String args[]){ <br>
//implementation of main mehtod} <br>
} <br>
Which statement is true? <br>
A. x=2 is a valid assignment in the main() method of class Example. <br>
B. Changing private int x to int x would make x=2 a valid assignment in the main() method of class Example. <br>
C. Changing private int x to public int x would make x=2 a valid assignment in the main() method of class Example. <br>
D. Changing private int x to static int x would make x=2 a valid assignment in the main() method of class Example. <br>
E. Changing class Example to public class Example would make x=2 a valid assignment in the main() method of class Example. <br>
<br>
67． Which statement is true about an inner class? <br>
A. It must be anonymous <br>
B. It can not implement an interface <br>
C. It is only accessible in the enclosing class <br>
D. It can access any final variables in any enclosing scope. <br>
<br>
68． Which statement is true about the grid bag layout manager? <br>
A. The number of rows and columns is fixed when the container is created. <br>
B. The number of rows and columns is fixed when the GridBagLayout object is created. <br>
C. If a component has a fill value of BOTH, then as the container change size, the component is resized. <br>
D. Every component must carry a non-zero weightx and weighty value when it is added to the container <br>
E. If a row has a weighty value that is non-zero, then as the container changes height, the row changes height. <br>
<br>
69． Which statement are true about writing a class that is to handle the events issued by a user interface component. <br>
A. Subclassing an adapter is inappropriate in this case. <br>
B. The class should implement some listener interface <br>
C. A class can implement multiple listener interfaces if desired. <br>
D. A subclass of an AWT component cannot listen to its own events. <br>
E. When implements listener interface, a class need only provide those handler methods that it chooses. <br>
<br>
70．The argument for a class?s main() method is called args, and the class is invoked as follows. <br>
java Example cat <br>
What would be the effect of trying to access args[0] in the main method? <br>
A. The value produced is cat <br>
B. The value produced is java <br>
C. The value produced is Example <br>
D. An object of type NullPointerException is thrown. <br>
E. An object of type ArrayIndexOutofBoundsException is thrown. <br>
71． Which best describes the requirements of a fully encapsulated class? <br>
A. Mehtods must not be private. <br>
B. Variables must not be public. <br>
C. The class must be marked final <br>
D. Public methods are all marked final. <br>
E. Modification of the objects state is only possible using method calls. <br>
<br>
72．Which contains objects without ordering, duplication, or any particular lookup/retrieval mechanism? <br>
A. Map <br>
B. Set <br>
C. List <br>
D. Collection <br>
E. Enumeration <br>
<br>
73．What might cause the current thread to stop executing? <br>
A. An interrupted exception is thrown. <br>
B. The thread execute a sleep() call. <br>
C. The thread constructs a new thread <br>
D. A thread of higher priority becomes ready <br>
E. The thread executes a read() call on InputStream <br>
<br>
74．Which statements are true about threads? <br>
A. Threads created from the same class all finish together. <br>
B. A thread can be created only by subclassing java.lang.Thread. <br>
C. Invoking the suspend() method stops a thread so that it cannot be restarted. <br>
D. The Java interpreter?s natural exit occurs when no non-daemon threads remain alive. <br>
E. Uncoordinated changes to shared data by multiple threads may result in the data being read, or left, in an inconsistent state. <br>
<br>
75．What might form part of a correct inner class declaration or combined declaration and instantiation? <br>
A. private class C <br>
B. new SimpleInterface(){ <br>
C. new ComplexInterface(x){ <br>
D. private final abstract class( <br>
E. new ComplexClass() implements SimpleInterface <br>
76． Which statements are true about the garbage collection mechanisms? <br>
A. The garbage collection mechanism release memory at pridictable times. <br>
B. A correct program must not depend upon the timing or order of garbage collection <br>
C. Garbage collection ensures that a program will NOT run out of memory during execution <br>
D. The programmer can indicate that a reference through a local variable is no longer going to be used. <br>
E. The programmer has a mechanism that explicitly and immediately frees the memory used by Java objects. <br>
<br>
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