1Z0-804 試験問題を無料オンラインアクセス

Given the code fragment:

Assume that the SQL queries return records. What is the result of compiling and executing this code fragment?

• A.Compilation fails on line ***
• B.The program prints customer IDs
• C.The program prints Error
• D.The program prints employee IDs

Which represents part of a DAO design pattern?

• A.class EmployeeDAO {
  int getID() { return 0;}
  Employee findByID (int id) { return null;}
  void update () {}
  void delete () {}
  }
• B.interface EmployeeDAO {
  int getID();
  Employee findByID (intid);
  void update(); void delete(); }
• C.class EmployeeDAO {
  void create (Employee e) {}
  void update (Employee e) {}
  void delete (int id) {}
  Employee findByID (int id) {return id}
  }
• D.interface EmployeeDAO { void create (Employee e); void update (Employee e); void delete (int id); Employee findByID (int id); }
• E.interface EmployeeDAO {
  void create (Connection c, Employee e);
  void update (Connection c, Employee e);
  void delete (Connection c, int id);
  Employee findByID (Connection c, int id); }

Which statement declares a generic class?

• A.public class Example (G) { }
• B.public class <Example> { }
• C.public class Example (Generic) { }
• D.public class Example <> { }
• E.public class Example { }
• F.public class Example < T > { }

Assuming the port statements are correct, which two (three?) code fragments create a one-byte file?

• A.OutputStream fos = new FileOutputStream ("/tmp/data.bin"); fos.writeByte(0); fos.close();
• B.OutputStream fos = new FileOutputStream ("/tmp/data.bin"); DataOutputStream dos = new DataOutputStream(fos); dos.writeByte(0); dos.close();
• C.OutputStream fos = new FileOutputStream (new File ("/tmp/data.bin"));
  DataOutputStream dos = new DataOutputStream(fos);
  dos.writeByte(0);
  dos.close();
• D.OutputStream fos = new FileOutputStream(new File("/tmp/data.bin"));
  OutputStream bos = new BufferedOutputStream(fos);
  DataOutputStream dos = new DataOutputStream(bos);
  dos.writeByte(0);
  dos.close();

Given:

What is the result?

• A.class java.lang.ArraylndexOutOfBoundsException
• B.class java.lang.NullPointerException
• C.Compilation fails.
• D.class java.lang.Exception
• E.Null