📄 中文java技术网scjp考试题310-025(第一套).htm
字号:
AB.<br />
11. You have the following code. Which numbers will cause "Test2" to be<br />
printed?<br />
switch(x){<br />
case 1:<br />
System.out.println("Test1");<br />
case 2:<br />
case 3:<br />
System.out.println("Test2");<br />
break;<br />
}<br />
System.out.println("Test3");<br />
}<br />
A. 0<br />
B. 1<br />
C. 2<br />
D. 3<br />
E. 4<br />
BCD.<br />
12. Which statement declares a variable a which is suitable for<br />
referring to an array of 50 string objects?<br />
A. char a[][];<br />
B. String a[];<br />
C. String []a;<br />
D. Object a[50];<br />
E. String a[50];<br />
F. Object a[];<br />
BCF.<br />
13. What should you use to position a Button within an application<br />
frame so that the width of the Button is affected by the Frame size but<br />
the height is not affected.<br />
A. FlowLayout<br />
B. GridLayout<br />
C. Center area of a BorderLayout<br />
D. East or West of a BorderLayout<br />
E. North or South of a BorderLayout<br />
E.<br />
14. What might cause the current thread to stop executing?<br />
A. An InterruptedException is thrown<br />
B. The thread executes a sleep() call<br />
C. The thread constructs a new Thread<br />
D. A thread of higher priority becomes ready (runnable)<br />
E. The thread executes a read() call on an InputStream<br />
ABDE.<br />
Non-runnable states:<br />
* Suspended: caused by suspend(), waits for resume()<br />
* Sleeping: caused by sleep(), waits for timeout<br />
* Blocked: caused by various I/O calls or by failing to get a monitor's<br />
lock, waits for I/O or for the monitor's lock<br />
* Waiting: caused by wait(), waits for notify() or notifyAll()<br />
* Dead: Caused by stop() or returning from run(), no way out<br />
15. Consider the following code:<br />
String s = null;<br />
Which code fragments cause an object of type NullPointerException to be<br />
thrown?<br />
A. if((s!=null) & (s.length()>0))<br />
B. if((s!=null) &&(s.length()>0))<br />
C. if((s==null) | (s.length()==0))<br />
D. if((s==null) || (s.length()==0))<br />
AC.<br />
16. Given the following method body:<br />
{<br />
if (sometest()) {<br />
unsafe();<br />
}<br />
else {<br />
safe();<br />
}<br />
}<br />
The method "unsafe" might throw an IOException (which is not a subclass<br />
of RunTimeException). Which correctly completes the method of<br />
declaration when added at line one?<br />
A. public void methodName() throws Exception<br />
B. public void methodname()<br />
C. public void methodName() throw IOException<br />
D. public void methodName() throws IOException<br />
E. public IOException methodName()<br />
AD.<br />
17. What would be the result of attempting to compile and run the<br />
following piece of code?<br />
public class Test {<br />
static int x;<br />
public static void main(String args[]){<br />
System.out.println("Value is " + x);<br />
}<br />
}<br />
A. The output "Value is 0" is printed.<br />
B. An object of type NullPointerException is thrown.<br />
C. An "illegal array declaration syntax" compiler error occurs.<br />
D. A "possible reference before assignment" compiler error occurs.<br />
E. An object of type ArrayIndexOutOfBoundsException is thrown.<br />
A.<br />
18. What would be the result of attempting to compile and run the<br />
following piece of code?<br />
public class Test {<br />
public int x;<br />
public static void main(String args[]){<br />
System.out.println("Value is " + x);<br />
}<br />
}<br />
A. The output "Value is 0" is printed.<br />
B. Non-static variable x cannot be referenced from a static context..<br />
C. An "illegal array declaration syntax" compiler error occurs.<br />
D. A "possible reference before assignment" compiler error occurs.<br />
E. An object of type ArrayIndexOutOfBoundsException is thrown.<br />
B.<br />
19. What would be the result of attempting to compile and run the<br />
following piece of code?<br />
public class Test {<br />
public static void main(String args[]){<br />
int x;<br />
System.out.println("Value is " + x);<br />
}<br />
}<br />
A. The output "Value is 0" is printed.<br />
B. An object of type NullPointerException is thrown.<br />
C. An "illegal array declaration syntax" compiler error occurs.<br />
D. A "possible reference before assignment" compiler error occurs.<br />
E. An object of type ArrayIndexOutOfBoundsException is thrown.<br />
D. </td>
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<font color=red>发言人:</font><b>过客</b> 日期：2005-01-06<hr>8 true should be keyword.<br><br><br> <font color=red>发言人:</font><b>huiwu917</b> 日期：2005-01-07<hr>1，sizeof都不是java的关键字，熟悉c或者c＋＋，写惯了asp的高手就要小心喽。<br />
2，所有的关键字都是小写的，instanceof看上去像方法名，但其实是关键字；<br />
3，大写的NULL不是java语言的关键字。<br><br><br> <font color=red>发言人:</font><b>huiwu917</b> 日期：2005-01-07<hr>关键字列表<br />
<br />
abstract boolean break byte case<br />
catch char class continue default<br />
do double else extends false<br />
final finally float for if<br />
implements import instanceof int interface<br />
long native new null package<br />
private protected public return short<br />
static super switch synchronized this<br />
throw throws transient true try<br />
void volatile while <br />
<br />
保留字<br />
const，goto<br />
<br><br><br> <font color=red>发言人:</font><b>huiwu917</b> 日期：2005-01-07<hr>最重要的一点就是所有的关键字都是小写,一看到大写就打杈,呵呵!!简单!<br />
这题是错了!<br><br><br> <font color=red>发言人:</font><b>huiwu917</b> 日期：2005-01-07<hr>最重要的一点就是所有的关键字都是小写,一看到大写就打杈,呵呵!!简单!<br />
这题是错了!<br><br><br> <font color=red>发言人:</font><b>huiwu917</b> 日期：2005-01-07<hr>如果给你一个String 或Float来判断,也判断他们不是,它们只是JAVA里的encapsulation类而已!不是所谓的关键字!<br><br><br> <font color=red>发言人:</font><b>过客</b> 日期：2005-03-20<hr>老大 关键字列表中true是关键字吗？？ <br><br><br> <font color=red>发言人:</font><b>过客</b> 日期：2005-04-23<hr>true是关键字<br><br><br> <font color=red>发言人:</font><b>jzhdsun</b> 日期：2005-04-25<hr>非常感谢你的试题<br><br><br> </td>
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