SUN CERTIFICATION

QUESTION 1: 

Given the code in the exhibit. What is the result?

A. Compilation fails

B. An exception is thrown at runtime.

C. An instance of Forest is serialized.

D. An instance of Forest and an instance of Tree are both serialized.

Answer: B 

QUESTION 2:

Which code, inserted ay line 14, will allow this class to correctly serialized and desterilize?

A. S. default ReadObject ( );

B. This = s.defaultReadObject ( );

C. Y = s.default ( ); x = s.readInt ( );

D. X = s.readlInt; y = s.readInt ( );

Answer: D 

QUESTION 3:

Given the exhibit.

What is the result?

A. 0

B. 1

C. 4

D. Compilation fails

E. An exception is thrown at runtime

Answer: D 

QUESTION 4:

Given the exhibit: The variable df is an object of type DateFormat that has been initialized in line 11.

What is the result if this code is run on December 14,2000?

A. The value of S is 14 - dic-2004

B. The value of S is Dec 14, 2000

C. An exception is thrown at runtime

D. Compilation fails because of an error in line 13.

Answer: D 

QUESTION 5:

The doesFileExist method takes an array of directory names representing a path

from the root filesystem and a file name. The method returns true if the file exists,

falst if does not.

Place the code fragments in position to complete this method.

Answer: Explanation:

Example code:

import java.io.*;

public class test2 {

public static void main(String [ ]a){

test2 t = new test2( );

string [ ]d = new string[2];

d[0] = "C:";

system.out.print1n(t.doesFileExist(d,"test"));

}

public boolean doesFileExist(String [ ]directories,String

filename){

String path = "";

for(String dir: directories){

path = path +File.separator+dir;

//path = path.getSubdirectory (dir);

}

System.out.print1n(path);

File file = new File(path,filename);

return file.exists();

}

}

QUESTION 6:

Given:

System.out.printf("Pi is approximately %f and E is approximately %b", Math.PI,

Math.E);

Answer: 

QUESTION 7:

When comparing java. Io. BufferedWriter to java.io.FileWriter, which capability exist as a method in

only one of the two?

A. closing the stream

B. flushing the stream

C. writing to the stream

D. marking a location in the stream

E. writing a line separator to the stream

Answer: E 

QUESTION 8:

Given the exhibit: Which two code fragments, inserted independently at line 3, generate the output 4247?

(choose two)

A. String s = "123456789"

S. = (s-"123").replace (1,3, "24") - "89";

B. StringBuffer s = new StringBuffer ("123456789"); S.delete (0,3) replace(1,3,"24"). Delete (4,6)

C. StringBuffer s = new StringBuffer ("123456789"); S.substring (3,6).delete(1,3). insert (1, "24").

D. StringBuilder s \= new StringBuilder ("123456789"); S.substring (3,6) delete (1,2). insert (1, "24")

E. StringBuilder s = new StringBuilder ("123456789"); S.delete (0,3) replace(1,3,). Delete (2,5) insert (1, "24")

Answer: B,E 

QUESTION 9:

Which three statements concerning the use of the java . io. Realizable interface are true? (choose three)

A. Object from classes that use aggregation cannot be serialized.

B. An object serialized on one JVM can be successfully desterilized on a different JVM.

C. The values in fields with the Volatile modifier will NOT survive serialization and deserialization

D. The values in field with the transient modifier will NOT survive serialization and deserialization

E. It is legal to serialize an object of a type that has a supertype that does NOT implement java .io.Serialization

Answer: B,D,E 

QUESTION 10:

Given the exhibit: What is the result?

A. short Long

B. SHORT LONG

C. Compilation fails

D. An exception is thrown at runtime

Answer: C