C. Java.io.EncodeOutputStream. D. Java.io.EncodeWriter.
E. Java.io.BufferedOutputStream. Answer: B
Question No 38
The file “file.txt” exists on the file system and contsins ASCII text. Given: 38. try {
39. File f = new File(“file.txt”);
40. OutputStream out = new FileOutputStream(f, true); 41. }
42. catch (IOException) {} What is the result?
A. The code does not compile.
B. The code runs and no change is made to the file. C. The code runs and sets the length of the file to 0. D. An exception is thrown because the file is not closed. E. The code runs and deletes the file from the file system. Answer: A
Question No 39
Which constructs a DataOutputStream? A. New dataOutputStream(“out.txt”);
B. New dataOutputStream(new file(“out.txt”)); C. New dataOutputStream(new writer(“out.txt”)); D. New dataOutputStream(new FileWriter(“out.txt”)); E. New dataOutputStream(new OutputStream(“out.txt”)); F. New dataOutputStream(new FileOutputStream(“out.txt”)); Answer: F
Question No 40
What writes the text “ ” to the end of the file “file.txt”? A. OutputStream out= new FileOutputStream (“file.txt”); Out.writeBytes (“ /n”);
B. OutputStream os= new FileOutputStream (“file.txt”, true); DataOutputStream out = new DataOutputStream(os); out.writeBytes (“ /n”);
C. OutputStream os= new FileOutputStream (“file.txt”); DataOutputStream out = new DataOutputStream(os); out.writeBytes (“ /n”);
D. OutputStream os= new OutputStream (“file.txt”, true); DataOutputStream out = new DataOutputStream(os); out.writeBytes (“ /n”); Answer: B
Question No 41 Given:
1. public class X ( 2. public object m () {
3. object o = new float (3.14F); 4. object oa = new object [1]; 5. oa[0]= o; 6. o = null; 7. return oa[0]; 8. } 9. }
When is the float object created in line 3, eligible for garbage collection?
A. Just after line 5 B. Just after line 6
C. Just after line 7 (that is, as the method returns) D. Never in this method. Answer: D
Question No 42 Given:
3. string foo = “ABCDE”; 4. foo.substring(3); 5. foo.concat(“XYZ”); 6.
Type the value of foo at line 6. Answer: ABCDE Question No 43
Which method is an appropriate way to determine the cosine of 42 degrees?
A. Double d = Math.cos(42); B. Double d = Math.cosine(42);
C. Double d = Math.cos(Math.toRadians(42)); D. Double d = Math.cos(Math.toDegrees(42)); E. Double d = Math.cosine(Math.toRadians(42)); Answer: C
Question No 44
You need to store elements in a collection that guarantees that no duplicates are stored and all elements
can be accessed in natural order. Which interface provides that capability?
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: D
Question No 45
Which statement is true for the class java.util.HashSet? 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: C
Question No 46 Given:
1. public class IfTest (
2. public static void main(stringargs) { 3. int x = 3; 4. int y = 1; 5. if (x = y)
6. system.out.printIn(“Not equal”); 7. else
8. system.out.printIn(“Equal”); 9. } 10. )
What is the result?
A. The output is “Equal”
B. The output in “Not Equal”
C. An error at line 5 causes compilation to fall. D. The program executes but does not print a message. Answer: C ||| Question No 47 Exhibit:
1. public class test (
2. public static void main(string args) { 3. int 1= 0; 4. while (i) { 5. if (i==4) { 6. break; 7. ) 8. ++i; 9. ) 10. 11. )
12. )
What is the value of i at line 10? A. 0 B. 3 C. 4 D. 5
E. The code will not compile. Answer: E
Question No 48 Given:
3. int i= 1, j= 10 ; 4. do (
5. if (i++> --j) continue; 6. ) while (i<5);
After execution, what are the values for I and j? A. i = 6 and j= 5 B. i = 5 and j= 5 C. i = 6 and j= 4 D. i = 5 and j= 6 E. i = 6 and j= 6 Answer: D
Question No 49 Given:
1. switch (i) { 2. default: 310-025
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3. System.out.printIn(“Hello”); 4. )
What are the two acceptable types for the variable i? (Choose Two) A. Char B. Byte C. Float D. Double E. Object Answer: A, B Question No 50 Given:
1. public class foo {
2. public static void main (stringargs) 3. try {return;}
4. finally {system.out.printIn(“Finally”);}
5. } 6. )
What is the result?
A. The program runs and prints nothing. B. The program runs and prints “Finally”
C. The code compiles, but an exception is thrown at runtime. D. The code will not compile because the catch block is missing. Answer: B
这是第2套题中的51-90题 310-025
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Question No 51 Exhibit:
1. import java.io.IOException; 2. public class ExceptionTest(
3. public static void main (Stringargs) 4. try (
5. methodA();
6. ) catch (IOException e) (
7. system.out.printIn(“Caught IOException”); 8. ) catch (Exception e) (
9. system.out.printIn(“Caught Exception”); 10. ) 11. )
12. public void methodA () { 13. throw new IOException (); 14. ) 15. )
What is the result?
A. The code will not compile.
B. The output is caught exception. C. The output is caught IOException.
D. The program executes normally without printing a message. Answer: A
Question No 52 Exhibit:
1. public class test {
2. public static string output = “” 3.
4. public static void foo(int i) { 5. try {
6. if(i= =1) {