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Oracle 1z0-809 Exam Sample Questions


Question # 1

Given the code fragment:
ZonedDateTime depart = ZonedDateTime.of(2015, 1, 15, 3, 0, 0, 0, ZoneID.of(“UTC-7”));
ZonedDateTime arrive = ZonedDateTime.of(2015, 1, 15, 9, 0, 0, 0, ZoneID.of(“UTC-5”));
long hrs = ChronoUnit.HOURS.between(depart, arrive); //line n1
System.out.println(“Travel time is” + hrs + “hours”);
What is the result?

A.

Travel time is 4 hours

B.

Travel time is 6 hours

C.

Travel time is 8 hours

D.

An exception is thrown at line n1.



D.

An exception is thrown at line n1.





Question # 2

Given:
public class Test<T> {
private T t;
public T get () {
return t;
}
public void set (T t) {
this.t = t;
}
public static void main (String args [ ] ) {
Test<String> type = new Test<>();
Test type 1 = new Test ();//line n1
type.set(“Java”);
type1.set(100);//line n2
System.out.print(type.get() + “ “ + type1.get());
What is the result?

A.

Java 100

B.

java.lang.string@<hashcode>java.lang.Integer@<hashcode>

C.

A compilation error occurs. To rectify it, replace line n1 with:
Test<Integer> type1 = new Test<>();

D.

A compilation error occurs. To rectify it, replace line n2 with:
type1.set (Integer(100));



C.

A compilation error occurs. To rectify it, replace line n1 with:
Test<Integer> type1 = new Test<>();





Question # 3

You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?

A.

Make the class static.

B.

Make the constructor private.

C.

Override equals() and hashCode() methods of the java.lang.Object class.

D.

Use a static reference to point to the single instance.

E.

Implement the Serializable interface.



A.

Make the class static.


B.

Make the constructor private.





Question # 4

Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?

A.

Class C extends A implements X { }

B.

Class C implements Y extends B { }

C.

Class C extends A, B { }

D.

Class C implements X, Y extends B { }

E.

Class C extends B implements X, Y { }



A.

Class C extends A implements X { }


E.

Class C extends B implements X, Y { }


extends is for extending a class.
implements is for implementing an interface.
Java allows for a class to implement many interfaces.




Question # 5

Given:
public class Emp {
String fName;
String lName;
public Emp (String fn, String ln) {
fName = fn;
lName = ln;
}
public String getfName() { return fName; }
public String getlName() { return lName; }
}
and the code fragment:
List<Emp> emp = Arrays.asList (
new Emp (“John”, “Smith”),
new Emp (“Peter”, “Sam”),
new Emp (“Thomas”, “Wale”));
emp.stream()
//line n1
.collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending
order of fName and then ascending order of lName?

A.

sorted
(Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))

B.

sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))

C.

map(Emp::getfName).sorted(Comparator.reserveOrder())

D.

map(Emp::getfName).sorted(Comparator.reserveOrder().map(Emp::getlName).reserved



A.

sorted
(Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))




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