Real Oracle 1Z0-809 Exam Questions Answers - Exam4Lead
                     Orac le
1Z0-80 9
Java SE 8 Programmer II
 
  
 
https://www.exam4lead.com/oracle/1z0-809-dumps.html
 
Question: 1 
 
Given the definition of the Vehicle class: 
Class Vehhicle { 
int distance;//line n1 
Vehicle (int x) { 
this distance = x; 
} 
public void increSpeed(int time) {//line n2 
int timeTravel = time;//line n3 
class Car { 
int value = 0; 
public void speed () { 
value = distance /timeTravel; 
System.out.println (“Velocity with new speed”+value+”kmph”); 
} 
} 
new Car().speed(); 
} 
} 
and this code fragment: 
Vehicle v = new Vehicle (100); 
v.increSpeed(60); 
What is the result? 
 
A. Velocity with new speed 
B. A compilation error occurs at line n1. 
C. A compilation error occurs at line n2. 
D. A compilation error occurs at line n3. 
 
Answer: A 
 
Question: 2 
 
Given: 
IntStream stream = IntStream.of (1,2,3); 
IntFunction inFu= x -> y -> x*y;//line n1 
IntStream newStream = stream.map(inFu.apply(10));//line n2 
newStream.forEach(System.out::print); 
Which modification enables the code fragment to compile? 
 
A. Replace line n1 with:IntFunction inFu = x -> y -> x*y; 
B. Replace line n1 with:IntFunction inFu = x -> y -> x*y; 
C. Replace line n1 with:BiFunction inFu = x -> y -> x*y; 
 
D. Replace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10)); 
 
Answer: B 
 
Question: 3 
 
Given the code fragment: 
List values = Arrays.asList (1, 2, 3); 
values.stream () 
.map(n -> n*2)//line n1 
.peek(System.out::print)//line n2 
.count(); 
What is the result? 
 
A. 246 
B. The code produces no output. 
C. A compilation error occurs at line n1. 
D. A compilation error occurs at line n2. 
 
Answer: A 
 
Question: 4 
 
Given the code fragment: 
public class Foo { 
public static void main (String [ ] args) { 
Map unsortMap = new HashMap ( ); 
unsortMap.put (10, “z”); 
unsortMap.put (5, “b”); 
unsortMap.put (1, “d”); 
unsortMap.put (7, “e”); 
unsortMap.put (50, “j”); 
Map treeMap = new TreeMap  (new 
Comparator ( ) { 
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo 
(o1); } } ); 
treeMap.putAll (unsortMap); 
for (Map.Entry entry : treeMap.entrySet () ) { 
System.out.print (entry.getValue () + “ “); 
} 
} 
} 
What is the result? 
 
 
A. A compilation error occurs. 
B. d b e z j 
C. j z e b d 
D. z b d e j 
 
Answer: C 
 
Question: 5 
 
Which two reasons should you use interfaces instead of abstract classes? (Choose two.) 
 
A. You expect that classes that implement your interfaces have many common methods or fields, or 
require access modifiers other than public. 
B. You expect that unrelated classes would implement your interfaces. 
C. You want to share code among several closely related classes. 
D. You want to declare non-static on non-final fields. 
E. You want to take advantage of multiple inheritance of type. 
 
Answer: B,E 
 
Question: 6 
 
Given: 
public class Counter { 
public static void main (String[ ] args) { 
int a = 10; 
int b = -1; 
assert (b >=1) : “Invalid Denominator”; 
int с = a / b; 
System.out.println (c); 
} 
} 
What is the result of running the code with the –ea option? 
 
A. -10 
B. 0 
C. An AssertionError is thrown. 
D. A compilation error occurs. 
 
Answer: C 
 
Question: 7 
 
 
Given: 
class Bird { 
public void fly () { System.out.print(“Can fly”); } 
} 
class Penguin extends Bird { 
public void fly () { System.out.print(“Cannot fly”); } 
} 
and the code fragment: 
class Birdie { 
public static void main (String [ ] args) { 
fly( ( ) -> new Bird ( )); 
fly (Penguin : : new); 
} 
/* line n1 */ 
} 
Which code fragment, when inserted at line n1, enables the Birdie class to compile? 
 
A. static void fly (Consumer bird) {bird :: fly ();} 
B. static void fly (Consumer