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SCJP考试题310-025[5](1)
添加时间: 2007-9-23 2:02:49 作者: JAVA题库 阅读次数:59 来源: http://www.d9soft.com
310-025
,QUESTION NO: 92
Given:
1. String foo = “blue”;
2. Boolean[]bar = new Boolean [1];
3. if (bar[0]) {
4. foo = “green”;
5. }
What is the result?
A. Foo has the value of “”
B. Foo has the value of null.
C. Foo has the value of “blue”
D. Foo has the value of “green”
E. An exception is thrown.
F. The code will not compile.
Answer: F
QUESTION NO: 93
Exhibit:
1. public class X {
2. public static void main (String[]args) {
3. String s1 = new String (“true”);
4. Boolean b1 = new Boolean (true);
5. if (s2.equals(b1)) {
6. System.out.printIn(“Equal”);
7. }
8. }
9. }
What is the result?
A. The program runs and prints nothing.
B. The program runs and prints “Equal”
C. An error at line 5 causes compilation to fail.
D. The program runs but aborts with an exception.
Answer: A
QUESTION NO: 94
Given:
1. public class Foo {
2. public static void main (String []args) {
3. int i = 1;
4. int j = i++;
5. if ((i>++j) && (i++ ==j)) {
6. i +=j;
7. }
8. }
9. }
What is the final value of i?
A. 1
B. 2
C. 3
D. 4
E. 5
Answer: B
QUESTION NO: 95
Exhibit:
1. public class X {
2. public static void main (String[]args) {
3. string s = new string (“Hello”);
4. modify(s);
5. System.out.printIn(s);
6. }
7.
8. public static void modify (String s) {
9. s += “world!”;
10. }
11. }
What is the result?
E. The program runs and prints “Hello”
F. An error causes compilation to fail.
G. The program runs and prints “Hello world!”
H. The program runs but aborts with an exception.
Answer: A
QUESTION NO: 96
Which two are equivalent? (Choose Two)
A. 16>4
B. 16/2
C. 16*4
D. 16>>2
E. 16/2^2
F. 16>>>2
Answer: D, E
QUESTION NO: 97
Exhibit:
1. public class X {
2. public static void main (String[]args) {
3. int [] a = new int [1]
4. modify(a);
5. System.out.printIn(a[0]);
6. }
7.
8. public static void modify (int[] a) {
9. a[0] ++;
10. }
11. }
What is the result?
A. The program runs and prints “0”
B. The program runs and prints “1”
C. The program runs but aborts with an exception.
D. An error “possible undefined variable” at line 4 causes compilation to fail.
E. An error “possible undefined variable” at line 9 causes compilation to fail.
Answer: B
QUESTION NO: 98
Given:
13. public class Foo {
14. public static void main (String [] args) {
15. StringBuffer a = new StringBuffer (“A”);
16. StringBuffer b = new StringBuffer (“B”);
17. operate (a,b);
18. system.out.printIn{a + “,” +b};
19. )
20. static void operate (StringBuffer x, StringBuffer y) {
21. y.append {x};
22. y = x;
23. )
24. }
What is the result?
A. The code compiles and prints “A,B”.
B. The code compiles and prints “A, BA”.
C. The code compiles and prints “AB, B”.
D. The code compiles and prints “AB, AB”.
E. The code compiles and prints “BA, BA”.
F. The code does not compile because “+” cannot be overloaded for stringBuffer.
Answer: B
QUESTION NO: 99
Given:
1. public class X {
2. public static void main (String[] args) {
3. byte b = 127;
4. byte c = 126;
5. byte d = b + c;
6. }
7. }
Which statement is true?
A. Compilation succeeds and d takes the value 253.
B. Line 5 contains an error that prevents compilation.
C. Line 5 throws an exception indicating “Out of range”
D. Line 3 and 4 contain error that prevent compilation.
E. The compilation succeeds and d takes the value of 1.
Answer: B
QUESTION NO: 100
Given:
1. public class WhileFoo {
2. public static void main (String []args) {
3. int x= 1, y = 6;
4. while (y--) {x--;}
5. system.out.printIn(“x=” + x “y =” + y);
6. }
7. }
What is the result?
A. The output is x = 6 y = 0
B. The output is x = 7 y = 0
C. The output is x = 6 y = -1
D. The output is x = 7 y = -1
E. Compilation will fail.
Answer: E
QUESTION NO: 101
Which statement is true?
A. The Error class is a untimeException.
B. No exceptions are subclasses of Error.
C. Any statement that may throw an Error must be enclosed in a try block.
D. Any statement that may throw an Exception must be enclosed in a try block.
E. Any statement that may thro a runtimeException must be enclosed in a try block.
Answer: D
QUESTION NO: 102
Exhibit:
1. int I=1, j=0
2.
3. switch(i) {
4. case 2:
5. j+=6;
6.
7. case 4:
8. j+=1;
9.
10. default:
11. j +=2;
12.
13. case 0:
14. j +=4;
15. }
16.
What is the value of j at line 16?
A. 0
B. 1
C. 2
D. 4
E. 6
Answer: AE
QUESTION NO: 103
Given:
1. switch (i) {
2. default:
3. System.out.printIn(“Hello”);
4. )
What is the acceptable type for the variable i?
A. Byte
B. Long
C. Float
D. Double
E. Object
F. A and B
G. C and D
Answer: A
QUESTION NO: 104
You need to store elements in a collection that guarantees that no duplicates are stored. Which two
interfaces provide that capability? (Choose Two)
A. Java .util.Map
B. Java.util.Set
C. Java.util.List
D. Java.util.StoredSet
E. Java.util.StoredMap
F. Java.util.Collection
Answer: B, D
QUESTION NO: 105
Which statement is true for the class java.util.ArrayList?
A. The elements in the collection are ordered.
B. The collection is guaranteed to be immutable.
C. The elements in the collection are guaranteed to be unique.
D. The elements in the collection are accessed using a unique key.
E. The elements in the collections are guaranteed to be synchronized.
Answer: A
QUESTION NO: 106
Exhibit:
1. public class X implements Runnable(
2. private int x;
3. private int y;
4.
5. public static void main(String[]args)
6. X that = new X();
7. (new Thread(that)).start();
8. (new Thread(that)).start();
9. )
10.
11. public void run() (
12. for (;;) (
13. x++;
14. y++;
15. System.out.printIn(“x=” + x + “, y = ” + y);
16. )
17. )
18. )
What is the result?
A. Errors at lines 7 and 8 cause compilation to fail.
B. The program prints pairs of values for x and y that might not always be the same on the same line
(for example, “x=2, y=1”).
C. The program prints pairs of values for x and y that are always the same on the same line (for
example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by
“x=1, y=1”).
D. The program prints pairs of values for x and y that are always the same on the same line (for
example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1”
followed by “x=2, y=2”).
Answer: D
QUESTION NO: 107
Given:
1. public class SyncTest {
2. private int x;
3. private int y;
4. public synchronized void setX (int i) (x=1;)
5. public synchronized void setY (int i) (y=1;)
6. public synchronized void setXY(int 1)(set X(i); setY(i);)
7. public synchronized Boolean check() (return x !=y;)
8. )
Under which conditions will check () return true when called from a different class?
A. Check() can never return true.
B. Check() can return true when setXY is called by multiple threads.
C. Check() can return true when multiple threads call setX and setY separately.
D. Check() can only return true if SyncTest is changed to allow x and y to be set separately.
Answer: A
QUESTION NO: 108
Which is a method of the MouseMotionListener interface?
A. Public void mouseDragged(MouseEvent)
B. Public boolean mouseDragged(MouseEvent)
C. Public void mouseDragged(MouseMotionEvent)
D. Public boolean MouseDragged(MouseMotionEvent)
E. Public boolean mouseDragged(MouseMotionEvent)
Answer: A
QUESTION NO: 109
Given:
1. String foo = “base”;
2. foo.substring(0,3);
3. foo.concat(“ket”);
4. foo += “ball”;
5.
Type the value of foo at line 8.
Answer: BASEBALL
QUESTION NO 110
Given:
1. public class Test {
2. public static void leftshift(int i, int j) {
3. i<<=j;
4. }
5. public static void main(String args[]) {
6. int i = 4, j = 2;
7. leftshift(i, j);
8. System.out.printIn(i);
9. }
10. }
What is the result?
A. 2
B. 4
C. 8
D. 16
E. The code will not compile.
Answer: B
QUESTION NO 111
Given:
1. public class Foo {
2. private int val;
3. public foo(int v) (val = v;) }
4. public static void main (String [] args) {
5. Foo a = new Foo (10);
6. Foo b = new Foo (10);
7. Foo c = a;
8. int d = 10;
9. double e = 10.0;
10. }
11. }
Which three logical expression evaluate to true? (Choose Three)
A. (a ==c)
B. (d ==e)
C. (b ==d)
D. (a ==b)
E. (b ==c)
F. (d ==10.0)
Answer: A, B, F
QUESTION NO 112
Exhibit:
1. public class X {
2. private static int a;
3.
5. public static void main (String[] args) {
6. modify (a);
7. }
8.
9. public static void modify (int a) {
10. a++;
11. }
12. }
What is the result?
A. The program runs and prints “0”
B. The program runs and prints “1”
C. The program runs but aborts with an exception.
D. En error “possible undefined variable” at line 5 causes compilation to fail.
F. En error “possible undefined variable” at line 10 causes compilation to fail.
Answer: A
QUESTION NO 113
Exhibit:
1. public class Test {
2. public static void replaceJ(string text) {
3. text.replace (‘j’, ‘l’);
4. }
5.
6. public static void main(String args[]) {
7. string text = new String (“java”)
8. replaceJ(text);
9. system.out.printIn(text);
10. }
11. }
What is the result?
A. The program prints “lava”
B. The program prints “java”
C. An error at line 7 causes compilation to fail.
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