Oracle Java SE 7 Programmer II Set 1

Event Quiz ✘ Event Event ✘ Quiz Quiz ✘ Quiz Event ✔ Compilation fails ✔

enums interfaces primitives abstract classes concrete classes

John Harry ✘ unknown Harry ✘ john unknown ✘ unknown unknown ✔ Compilation fails. ✔

for (Direction d : Direction.values()){ // } ✘ for (Direction d : Direction.asList()){// } ✘ for (Direction d : Direction.iterator()){// } ✘ for (Direction d : Direction.asArray()){// } ✔

Daniel ✘ Unknown ✘ It may print"unknown"or"Daniel"depending on the JVM implementation. ✘ Compilation fails. ✔ An exception is thrown at runtime. ✔

An enum is typesafe. An enum can implement an interface. An enum can declare a private constructor. All enums implicitly implement Comparable. An enum can subclass another enum.

new Task().new Counter().increment(); ✘ new Task().Counter().increment(); ✘ new Task.Counter().increment(); ✘ Task.Counter().increment(); ✔ Task.Counter.increment(); ✔

interface EmployeeDAO { int getID(); Employee findByID (intid); void update(); void delete(); } ✘ class EmployeeDAO {int getID() { return 0;} Employee findByID (int id) { return null;} void update () {} void delete () {} } ✘ class EmployeeDAO {void create (Employee e) {} void update (Employee e) {} void delete (int id) {} Employee findByID (int id) {return id} } ✘ interface EmployeeDAO {void create (Employee e); void update (Employee e); void delete (int id); Employee findByID (int id); } ✔ 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); } ✔

public in getId () public String getContractDetails () public Void setContractDetails(String contactDetails) public String getName () public void setName (String name) ✘ public int getId ()public String getContractDetails() public String getName() public Person getPerson(int id) throws Exception ✘ public void setContractDetails(String contractDetails) public void setName(String name) ✘ public Person getPerson(int id) throws Exceptionpublic void createPerson(Person p) throws Exception public void deletePerson(int id) throws Exception public void updatePerson(Person p) throws Exception ✔

Using inheritance ✘ Method delegation ✘ Creating abstract classes ✘ Implementing the composite interface ✔