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

AclFileAttributeView
DosFileAttributeView
FileOwnerAttributeView
FileStoreAttributeView
BasicFileAttributeView

Correct answer: AC

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

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

Given:

What is the result?

1
2
3
4

Correct answer: B

Explanation:

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

Given:

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

rwlock.readLock().acquire();rwlock.readLock().release();
rwlock.readLock().lock();rwlock.readLock().unlock();
rwlock.getLock().acquire(); rwlock.getLock().release();
rwlock.getLock().lock();rwlock.getLock().Unlock();
relock.WriteLock().acquire();rwlock.writeLock().release();
rwlock.writeLock().lock();rwlock.WriteLock().unlock();

Correct 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.Incorrect answers:A: No such methods aquire or release.E, F: We do not need writelock.C, D: No method getlock.Reference: Class ReentrantReadWriteLock

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.

Incorrect answers:

A: No such methods aquire or release.

E, F: We do not need writelock.

C, D: No method getlock.

Reference: Class ReentrantReadWriteLock

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

matches(Path)
matches(Path), fails(Path)
matches(Path), fails(Path), enable(boolean)
matches(Path), fails(Path), setPreferred (String)

Correct 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 is matches:boolean matches(Path path)Tells if given path matches this matcher's pattern.Parameters:path – the path to matchReturns:true if, and only if, the path matches this matcher's pattern.Reference: java.nio.file.PathMatcher

The interface PathMatcher is an interface that is implemented by objects that perform match operations on paths.

The single method for this interface is matches:

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

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

new ()
make ()
create ()
getObject ()
getInstance ()
createObject ()

Correct answer: E

Explanation:

For example: KeyFactory.getInstance, ObjectFactory. getObjectInstance.

Given this code fragment:

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

Compilation fails.
The program prints Error
An exception is thrown at runtime
The statement at line 16 execute

Correct 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

There is no GetRowCount method in java.sql.ResultSetMetaData.

The following line will not compile:

int rowCount = rsmd.getRowCount();

Reference: java.sql.ResultSetMetaData

Which two methods are defined in the FileStore class print disk space information?

getTotalSpace ()
getFreeSpace ()
getUsableSpace ()
getTotalCapacity ()
getUsed ()

Correct answer: AC

Explanation:

A: The getTotalSpace() method returns the size, in bytes, of the file store.C: The getUsableSpace() method returns the number of bytes available to this Java virtual machine on the file store.Reference: Class java.nio.file.FileStore

A: The getTotalSpace() method returns the size, in bytes, of the file store.

C: The getUsableSpace() method returns the number of bytes available to this Java virtual machine on the file store.

Reference: Class java.nio.file.FileStore

Given:

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

rwlock.readLock().acquire();rwlock.readLock().release();
rwlock.readLock().lock();rwlock.readLock().unlock();
rwlock.getLock().acquire(); rwlock.getLock().release();
rwlock.getLock().lock();rwlock.getLock().Unlock();
rwlock.WriteLock().acquire();rwlock.writeLock().release();
rwlock.writeLock().lock();rwlock.WriteLock().unlock();

Correct 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.Incorrect answers:A: No such methods aquire or release.E, F: We do not need writelock.C, D: No method getlock.Reference: Class ReentrantReadWriteLock

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.

Incorrect answers:

A: No such methods aquire or release.

E, F: We do not need writelock.

C, D: No method getlock.

Reference: Class ReentrantReadWriteLock

Given the code fragment:

What is the result if the report.txt file contains

Welcome to the world of Java?

The file contains the first five characters.
The file contains the first four characters.
The contents of the file remain unchanged.
A NonWritableChannelException is thrown at runtime.

Correct answer: C

Explanation:

The truncate line will not change the file since the file size is less than 30.Reference: Interface SeekableByteChannel

The truncate line will not change the file since the file size is less than 30.

Reference: Interface SeekableByteChannel

What is the minimum SQL standard that a JDBC API implementation must support?

SQL-92
SQL 99
SQL-2003
JDBC 4.0

Correct answer: A

Explanation:

JDBC sets minimum SQL conformance to the SQL92 entry level SQL standard. This gives guaranteed wide portability for applications designed to run on many platforms.