11.classa {
12. public void process（） { System.out.print（”a，”）； } }
13. class b extends a {
14. public void process（） throws IOException {
15. super.process（）；
16. System.out.print（”b，”）；
17. throw new IOException（）；
18. } }
19. public static void main（String[] args） {
20. try { new b（）.process（）； }
21. catch （IOException e） { System.out.println（”Exception”）； } }
What is the result？（）
A. Exception
B. a，b，Exception
C. Compilation fails because of an error in line 20.
D. Compilation fails because of an error in line 14.
E. A NullPointerException is thrown at runtime.
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33. try {
34. // some code here
35. } catch （NullPointerException e1） {
36. System.out.print（”a”）；
37. } catch （RuntimeException e2） {
38. System.out.print（”b”）；
39. } finally {
40. System.out.print（”c”）；
41. }
What is the result if a NullPointerException occurs on line 34？（）
A. c
B. a
C. ab
D. ac
E. bc
F. abc
Class TestException
1. public class TestException extends Exception {
2. } Class a：
1. public class a {
2.
3. public String sayHello（String name） throws TestException {
4.
5. if（name == null） {
6. throw new TestException（）；
7. }
8.
9. return “Hello “+ name；
10. }
11.
12. }
A programmer wants to use this code in an application：
45. A a=new A（）；
46. System.out.println（a.sayHello（”John”））；
Which two are true？（）
A. Class a will not compile.
B. Line 46 can throw the unchecked exception TestException.
C. Line 45 can throw the unchecked exception TestException.
D. Line 46 will compile if the enclosing method throws a TestException.
E. Line 46 will compile if enclosed in a try block， where TestException is caught.
public class SomeException {
} Class a：
public class a {
public void doSomething（） { }
} Class b：
public class b extends a {
public void doSomething（） throws SomeException { }
}
Which is true about the two classes？（）
A. Compilation of both classes will fail.
B. Compilation of both classes will succeed.
C. Compilation of class a will fail. Compilation of class b will succeed.
D. Compilation of class a will fail. Compilation of class a will succeed.
23.int z=5；
24.
25. public void stuff1（int x） {
26. assert （x> 0）；
27. switch（x） {
28. case 2： x= 3；
29. default： assert false； } }
30.
31. private void stuff2（int y） { assert （y < 0）； }
32.
33. private void stuff3（） { assert （stuff4O）； }
34.
35. private boolean stuff4（） { z = 6； return false； }
Which is true？（）
A. All of the assert statements are used appropriately.
B. Only the assert statement on line 31 is used appropriately.
C. The assert statements on lines 29 and 31 are used appropriately.
D. The assert statements on lines 26 and 29 are used appropriately.
E. The assert statements on lines 29 and 33 are used appropriately.
F. The assert statements on lines 29， 31， and 33 are used appropriately.
G. The assert statements on lines 26， 29， and 31 are used appropriately.
public class Test {
public static void main（String [] args） {
boolean assert = true；
if（assert） {
System.out.println（”assert is true”）；
}
}
}
Given：
javac -source 1.3 Test.java
What is the result？（）
A. Compilation fails.
B. Compilation succeeds with errors.
C. Compilation succeeds with warnings.
D. Compilation succeeds without warnings or errors.
public class AssertStuff {
public static void main（String [] args） {
int x= 5；
int y= 7；
assert （x> y）： “stuff”；
System.out.println（”passed”）；
}
}
And these command line invocations：java AssertStuff java -ea AssertStuff What is the result？（）
A. passed stuff
B. stuff passed
C. passed An AssertionError is thrown with the word “stuff” added to the stack trace.
D. passed An AssertionError is thrown without the word “stuff” added to the stack trace.
E. passed An AssertionException is thrown with the word “stuff” added to the stack trace.
F. passed An AssertionException is thrown without the word “stuff” added to the stack trace.
public class test {
public static void main（String [] a） {
assert a.length == 1；
}
}
Which two will produce an AssertionError？（）
A. java test
B. java -ea test
C. java test file1
D. java -ea test file1
E. java -ea test file1 file2
F. java -ea：test test file1
public static void main（String[] args） {
for （int i=0；i<= 10；i++）{
if（ i>6） break；
}
System.out.println（i）；
}
What is the result？（）
A. 6
B. 7
C. 10
D. 11
E. Compilation fails.
F. An exception is thrown at runtime.
public static Iterator reverse（List list） {
Collections.reverse（list）；
return list.iterator（）；
}
public static void main（String[] args） {
List list = new ArrayList（）；
list.add（” 1”）； list.add（”2”）； list.add（”3”）；
for （Object obj： reverse（list））
System.out.print（obj + “，”）；
}
What is the result？（）
A. 3，2，1，
B. 1，2，3，
C. Compilation fails.
D. The code runs with no output.
E. An exception is thrown at runtime.
int x= 10；
do {
x--；
} while（x< 10）；
How many times will line 37 be executed？（）
A. ten times
B. zero times
C. one to me times
D. more than ten times
最新试题
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What is the result？（）
What is the result？（）
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A programmer iterates over the TreeSet and prints the name of each Drink object. What is the result？（）
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What is the result？（）
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