1Z1-804 무료 덤프문제 온라인 액세스

Given the fragment:

Which two valid alternatives to line 3 would decouple this application from a specific implementation of CustomerDAO?

• A.CustomerDAO custDao = CustomerDAO.getInstance();
• B.CustomerDAO custDao = CustomerDAO();
• C.CustomerDAO custDao = (CustomerDAO) new Object ();
• D.CustomerDAO custDao = (CustomerDAO) new CustomerDAOmemoryImp1();
• E.CustomerDAO custDao = customerDAOFactory.getInstance();

Given: Which three statements concerning the OO concepts "is-a" and "has-a" are true?

• A.Flimmer is-a Flommer
• B.Flommer has-a Tagget
• C.Flommer is-a Glommer
• D.Tagget is-a Plinkable
• E.Tagget has-a String
• F.Flommer is-a Plinkable
• G.Flimmer is-a Plinkable

Given the code fragment:

Why is there no output when otherMethod is called?

• A.Standard error is not mapped to the console.
• B.The exception is suppressed.
• C.There is a compilation error.
• D.An exception other than IOException is thrown.

Given the interface:
Public interface Idgenerator {
int getNextId();
}
Which class implements IdGenerator in a thread-safe manner, so that no threads can get a duplicate id value current access?

• A.Public class Generator Implements IdGenerator {
  private int id = 0;
  public int getnextId() {
  synchronized (id) {
  return ++id;
  }}}
• B.Public class generator Implements IdGenerator {
  Private AtomicInteger id = new AtomicInteger (0);
  return id.incrementAndget();
  }}
• C.Public class Generator Implements idGenerator {
  private int id = 0;
  return ++id;
  }}
• D.Public class Generator Implements IdGenerator {
  private int id = 0;
  public int getNextId() {
  synchronized (new Generator()) {
  return ++id;
  }}}
• E.Public class Generator Implements IdGenerator {
  private volatile int Id = 0;
  return ++Id;
  }

Given: And the commands: javac Counter.java java ea Counter

What is the result?

• A.Compilation fails
• B.2
• C.AssertionError is thrown at runtime
• D.NullPointException is thrown at runtime
• E.3