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Most up-to-date 1Z0-805 Simple Questions Latest Practice Test Questions VCE PDF Dumps

Qustion No. 1

Which statement is true about the DSYNC constant defined in standardopenoptions enums? 

A. DSYNC keeps only the file content and not the metadata synchronized with the underlying storage device. 

B. DSYNC keeps the file (both content and metadata) synchronized with the underlying storage device. 

C. DSYNC keeps only the file metadata and not the file content synchronized with the underlying storage device. 

D. DSYNC keeps the file (both content and metadata) de-synchronized with copies in the und< storage device. 

Answer: A 

Explanation: DSYNC keeps the file content synchronized with the underlying storage device. 

Note: SYNC keeps the file (both content and metadata) synchronized with the underlying storage device. 

Note 2: These are from the java.nio.file.StandardOpenOption enum class. 

Qustion No. 2

Given the code fragment: 

SimpleDateFormat sdf; 

Which code fragment displays the two-digit month number? 

A. sdf = new SimpleDateFormat ("mm", Locale.UK); System.out.printIn ( “Result: ” + sdf.format(new Date())) 

B. sdf = new SimpleDateFormat ("MM", Locale.UK); System.out.printIn ( “Result: ” + sdf.format(new Date())) 

C. sdf = new SimpleDateFormat ("MMM", Locale.UK); System.out.printIn ( "Result: " + sdf.format(new Date())) 

D. sdf = new SimpleDateFormat ("MMMM", Locale.UK); System.out.printIn ( "Result: " + sdf.format(new Date())) 

Answer: B 

Explanation: B: Output example (displays current month numerically): 04 

Note: SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date -> text), parsing (text -> date), and normalization. SimpleDateFormat allows you to start by choosing any user-defined patterns for date-time formatting. However, you are encouraged to create a date-time formatter with either getTimeInstance, getDateInstance, orgetDateTimeInstance in DateFormat. Each of these class methods can return a date/time formatter initialized with a default format pattern. You may modify the format pattern using the applyPattern methods as desired. 

Qustion No. 3

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? 

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

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

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

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

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

F. 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 

Qustion No. 4

Which three must be used when using the Java.util.concurrent package to execute a task that returns a result without blocking? 

A. ExecutorService 

B. Runnable 

C. Future 

D. Callable 

E. Thread 

F. Executor 

Answer: A,D,F 

Explanation: The java.util.concurrent package defines three executor interfaces: 

* (F) Executor, a simple interface that supports launching new tasks. 

* (A) ExecutorService, a subinterface of Executor, which adds features that help manage the lifecycle, both of the individual tasks and of the executor itself. 

* ScheduledExecutorService, a subinterface of ExecutorService, supports future and/or periodic execution of tasks. 

Typically, variables that refer to executor objects are declared as one of these three interface types, not with an executor class type. 

D: The ExecutorService interface supplements execute with a similar, but more versatile submit method. Like execute, submit accepts Runnable objects, but also accepts Callable objects, which allow the task to return a value. 

Reference: The Java Tutorials, Executor Interfaces 

Qustion No. 5

Given the code fragment: 

try  

String query = "SELECT * FROM Employee WHERE ID=110"; 

Statement stmt = conn.createStatement(); 

ResultSet rs = stmt.executeQuery(query); // Line 13 

System.out.println("Employee ID: " + rs.getInt("ID")); // Line 14 

catch (Exception se)  

System.out.println("Error"); 

Assume that the SQL query matches one record. What is the result of compiling and executing this code? 

A. The code prints error. 

B. The code prints the employee ID. 

C. Compilation fails due to an error at line 13. 

D. Compilation fails due to an error at line 14. 

Answer: B 

Explanation: Assuming that the connection conn has been set up fine, the code will compile and run fine. 

Note #1: The GetInt method retrieves the value of the designated column in the current row of this ResultSet object as an int in the Java programming language. 

Note 2: A table of data representing a database result set, which is usually generated by executing a statement that queries the database. 

A ResultSet object maintains a cursor pointing to its current row of data. Initially the cursor is positioned before the first row. The next method moves the cursor to the next row, and because it returns false when there are no more rows in the ResultSet object, it can be used in a while loop to iterate through the result set. 

A default ResultSet object is not updatable and has a cursor that moves forward only. Thus, you can iterate through it only once and only from the first row to the last row. It is possible to produce ResultSet objects that are scrollable and/or updatable. 

Reference: The Java Tutorials, Interface ResultSet 

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