1Z0-805無料問題集「Oracle Upgrade to Java SE 7 Programmer」

質問 1

Given the code fragment:
public static void processFile () throws IOException { Try (FileReader fr = new FileReader ("logfilesrc.txt");
FileWriter fw = new FileWriter ("logfilesdst.txt") ) {
int i = fr.read();
}
}
Which statement is true?

（A）The java runtime automatically closes the FileReader Instance first and the FileWriter instance next.

（B）The code fragment contains compilation errors.

（C）The Java runtime may close the FileReader and FileWriter instance in an intermediate manner. Developers should not rely on the order in which they are closed.

（D）The developer needs to close the FileReader instance first and the FileWriter instance explicitly in a catch block.

（E）The java runtime automatically closes the FileWriter Instance first and the FileReader instance next.

正解：E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 2

Given the code fragment:
private static void copyContents (File source, File target) {
try {inputStream fis = new FileInputStream(source);
outputStream fos = new FileOutputStream (target);
byte [] buf = new byte [8192]; int i;
while ((i = fis.read(buf)) != -1) {
fos.write (buf, 0, i);
}
//insert code fragment here. Line **
System.out.println ("Successfully copied");
}
Which code fragments, when inserted independently at line **, enable the code to compile?

（A）} catch (InvalidPathException | IOException e) {
System.out.println(e);
}

（B）} catch (IOException | IndexOutOfBoundException e) {
System.out.println(e);
}

（C）} catch (IOException | NoSuchFileException e) {
System.out.println(e);
}

（D）} catch (Exception | IOException | FileNotFoundException e ) {
System.out.println(e);
}

（E）} catch (NoSuchFileException e ) {
System.out.println(e);
}

正解：A、B、E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 3

Which code fragments print 1?

（A）String arr [] = {"1", "2", "3"};
List <? extends String > arrList = new LinkedList <> (Arrays.asList (arr));
System.out.println (arrList.get (0));

（B）String arr [] = {"1", "2", "3"};
List <Integer> arrList = new LinkedList <> (Arrays.asList (arr));
System.out.println (arrList.get (0));

（C）String arr [] = {"1", "2", "3"};
List <?> arrList = new LinkedList <?> (Arrays.asList (arr));
System.out.println (arrList.get (0));

（D）String arr [] = {"1", "2", "3"};
List <?> arrList = new LinkedList <> (Arrays.asList (arr));
System.out.println (arrList.get (0));

（E）String arr [] = {"1", "2", "3"};
List <Integer> extends String > arrList = new LinkedList <Integer> (Arrays.asList (arr));
System.out.println (arrList.get (0));

正解：A、D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 4

Given:
class Fibonacci extends RecursiveTask<Integer> {
final int n;
Fibonacci (int n) { this.n = n }
Integer compute () {
if (n <= 1)
return n;
Fibonacci f1 = new Fibonacci (n - 1);
f1.fork; // Line X
Fibonacci f2 = new Fibonacci (n - 2); // Line Y
return f2.compute() + f1.join;
}
}
Suppose that lines X and Y are transposed:
Fibonacci f2 = new Fibonacci (n - 2); // Line Y
f1.fork; // Line X
What is the likely result?

（A）The program goes into an infinite loop

（B）An exception is thrown at runtime

（C）The program produces the correct result, with similar performance to the original

（D）The program produces the correct result, the better performance than the original.

（E）The program produces the correct result, with performance degraded to the equivalent of being single-threaded.

（F）The program produces an incorrect result

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 5

In the Java SE7 API, which method is most commonly used by factories to instantiate objects?

（A）make ()

（B）new ()

（C）getInstance ()

（D）create ()

（E）createObject ()

（F）getObject ()

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 6

Given:
import java.io.*;
public class SampleClass {
public static void main(String[] args) throws IOException {
try {
String dirName = args[0];
File dir = new File(dirName);
File.createTempFile("temp", "log", dir);
} catch (NullPointerException | IOException e) {
e = new IOException("Error while creating temp file");
throw e;
}
}
}
What is the result?

（A）A temporary file is created in the specified directory.

（B）An IOException with the default message is thrown at runtime.

（C）Compilation fails.

（D）An IOException with the message Error while creating temp file is thrown at runtime.

正解：C 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 7

Which three objects must a vendor provide implementations in its JDBC driver?

（A）RuleSet

（B）Connection

（C）Time

（D）Date

（E）Statement

（F）SQLException

（G）DriverManager

正解：B、E、F 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 8

Given the code fragment: SimpleDateFormat sdf = new SimpleDateFormat("zzzz", Locale.US);
System.out.println ("Result: " + sdf.format(today) ) ;
What type of result is printed?

（A）Time zone abbreviation

（B）Era

（C）Time of the Epoch (in milliseconds)

（D）Julian date

（E）Full-text time zone name

正解：E 解答を投票する

質問 9

Given the code fragment:
List<Person> pList = new CopyOnWriteArrayList<Person>();
Which statement is true?

（A）Read access to the List should be synchronized.

（B）Person objects retrieved from the List are thread-safe.

（C）A Person object retrieved from the List is copied when written to.

（D）Multiple threads can safely delete Person objects from the List.

（E）Write access to the List should be synchronized.

正解：B 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

1Z0-805 無料問題集「Oracle Upgrade to Java SE 7 Programmer」

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