Oracle 1z0-809 Exam Practice Questions (P. 1)

Given the definition of the Vehicle class:
Class Vehicle {
int distance;
Vehicle (int x) {
this distance = x;
}
public void increSpeed(int time) {
int timeTravel = time; //line n1
//line n3
class Car {
int value = 0;
public void speed () {
value = distance /timeTravel; //line n2
System.out.println ("Velocity with new speed"+value+"kmph");
}
}
speed(); //line n3
}
}
and this code fragment:
Vehicle v = new Vehicle (100);
v.increSpeed(60);
What is the result?

Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y; //line n1
IntStream newStream = stream.map(inFu.apply(10)); //line n2 newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?

Given the code fragment:
List<Integer> 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?

Given the code fragment:
public class Foo {
public static void main (String [ ] args) {
Map<Integer, String> unsortMap = new HashMap< > ( );
unsortMap.put (10, "z");
unsortMap.put (5, "b");
unsortMap.put (1, "d");
unsortMap.put (7, "e");
unsortMap.put (50, "j");
Map<Integer, String> treeMap = new TreeMap <Integer, String> (new
Comparator<Integer> ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {
System.out.print (entry.getValue () + " ");
}
}
}
What is the result?

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)