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Oracle 1Z0-805

Upgrade to Java SE 7 Programmer

Questions and Answers : 90
Q&A Update On : October 20, 2017
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Oracle 1Z0-805

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    Oracle 1Z0-805 (Upgrade to Java SE 7 Programmer)

    Questions and Answers : 90
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1Z0-805 Questions and Answers

1Z0-805

The Executors.newSingleThreadExecutor() method creates an Executor that uses a single worker thread operating off an unbounded queue.


Reference:

java.util.concurrent.Executors


QUESTION: 83

Given the code fragment: public class App {

public static void main (String [] args) {

path path = paths.get(“C\\educations\\institute\\student\\report.txt”); system.out.printIn(“getName(0): %s”, path.getName(0)); system.out.prinIn(“subpath(0, 2): %s” path.subpath(0, 2));

}

}

What is the result?


  1. getName (0): C:\

    subpath(0, 2): C:\education\report.txt

  2. getName (0): C:\

    subpath(0, 2): education\institute

  3. getName(0): education

    subpath(0, 2: education\institute\student

  4. getName(0): education subpath(0, 2): education\institute

  5. getName(0): report.txt subpath (0, 2): institute\student


Answer: D


Explanation:

The getName(int index) method returns a name element of this path as a Path object. The subpath(int beginIndex, int endIndex) method returns a relative Path that is a subsequence of the name elements of this path.


Reference:

java.nio.file.Path


QUESTION: 84

Given this code fragment: try {

String query = "SELECT * FROM Item"; Statement stmt = conn.createStatement(); ResultSet rs = stmt.executeQuery(query); ResultSetMetaData rsmd = rs.getMetaData(); int rowCount = rsmd.getRowCount();

System.out.println ("Processing: " + rowCount + " rows."); while (rs.next()) {

// Process each row

}

} catch (SQLException se) {

System.out.println("Error");

}

Assume that the SQL query returns records. What is the result?


  1. Compilation fails.

  2. The program prints Error

  3. An exception is thrown at runtime

  4. The statement at line 16 execute


Answer: A


Explanation:

There is no GetRowCount method in java.sql.ResultSetMetaData. The following line will not compile: int rowCount = rsmd.getRowCount();


Reference:

java.sql.ResultSetMetaData


QUESTION: 85

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


  1. new ()

  2. make ()

  3. create ()

  4. getObject ()

  5. getInstance ()

  6. createObject ()


Answer: E


Explanation:

For example: KeyFactory.getInstance, ObjectFactory. getObjectInstance.


QUESTION: 86

Which method or methods should you implement to create your own implementation of the java.nio.file.PathMatcher interface?


  1. matches(Path)

  2. matches(Path), fails(Path)

  3. matches(Path) , fails(Path), enable(boolean)

  4. matches(Path) , fails(Path) , setPreferred (String)

Answer: A


Explanation:

The interface PathMatcher is an interface that is implemented by objects that perform match operations on paths. The single method for this interface ismatches: boolean matches(Path path) Tells if given path matches this matcher's pattern. Parameters:

path - the path to match Returns: true if, and only if, the path matches this matcher's pattern.


Reference:

java.nio.file.PathMatcher


QUESTION: 87

Given:

public class MyGrades {

private final List<Integer> myGrades = new ArrayList<Integer>(); private final ReadWriteLock rwlock = new ReentrantReadWriteLock(); public void addGrade(Integer grade) {

// acquire lock myGrades.add(grade);

// release lock

}

public void averageGrades() {

// acquire lock Line ** double sum = 0;

int i = 0;

for (i = 0; i < myGrades.size(); i++) { sum += myGrades.get(i);

}

// release lock Line *** System.out.println("The average is: " + sum/(i+1));

}

}

Which pair’s statements should you insert at lines ** and lines *** (respectively) to acquire and release the most appropriate lock?


  1. rwlock.readLock().acquire(); rwlock.readLock().release();

  2. rwlock.readLock().lock(); rwlock.readLock().unlock();

  3. rwlock.getLock().acquire(); rwlock.getLock().release();

  4. rwlock.getLock().lock(); rwlock.getLock().Unlock();

  5. relock.WriteLock().acquire(); rwlock.writeLock().release();

  6. rwlock.writeLock().lock(); rwlock.WriteLock().unlock();


Answer: B


Explanation:

We need a read lock, not a write lock, we are just reading data, not writing/updating data.To aquire and release the lock the method lock() and unlock are used.


Reference:

Class ReentrantReadWriteLock


QUESTION: 88

Given:

public class StringApp {

public static void main(String[] args) {

String[] str="Java SE,java EE,Java ME,java FX".split(","); int count=0;

for(int i=0;i<str.length;i++) { switch(str[i]) {

case "Java SE": count++; continue; case "Java EE": count++; break; case "Java ME": count++; break; case "Java FX": count++; break;

}

}

System.out.println("Total match found="+count);

}

}

What is the result?


  1. 1

  2. 2

  3. 3

  4. 4

Answer: B


Explanation:

Java SE and Java ME will increase the count variable as it matches. java EE and java FX does not match.


QUESTION: 89

Which two file attribute views support reading or updating the owner of a file?


  1. AclFileAttributeView

  2. DosFileAttributeView

  3. FileOwnerAttributeView

  4. FileStoreAttributeView

  5. BasicFileAttributeView


Answer: A, C

Explanation:

A: The AclFileAttributeView is a file attribute view that supports reading or updating a file's Access Control Lists (ACL) or file owner attributes. C: The FileOwnerAttributeView.setOwner(UserPrincipal owner) method updates the file owner.


Reference: Interface AclFileAttributeView,Interface FileOwnerAttributeView


QUESTION: 90

Which two code blocks correctly initialize a Locale variable?


  1. Locale loc1 = "UK";

  2. Locale loc2 = Locale.get Instance ( "ru" );

  3. Locale loc3 = Locale.getLocaleFactory("RU");

  4. Locale loc4 = Locale.UK;

  5. Locale loc5 = new Locale("ru", "RU");


Answer: D, E


Reference:

The Java Tutorials,Creating a Locale

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