| Exam Code | 1z0-809 |
| Exam Name | Java SE 8 Programmer II |
| Questions | 196 Questions Answers With Explanation |
| Update Date | April 22,2024 |
| Price |
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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.
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 (newComparator ( ) {@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
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.
Given:IntStream stream = IntStream.of (1,2,3);IntFunction inFu= x -> y -> x*y;//line n1IntStream newStream = stream.map(inFu.apply(10));//line n2newStream.forEach(System.out::print);Which modification enables the code fragment to compile?
A. Replace line n1 with:IntFunction<UnaryOperator> inFu = x -> y -> x*y;
B. Replace line n1 with:IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
C. Replace line n1 with:BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;
D. Replace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10));
Given the definition of the Vehicle class:Class Vehhicle {int distance;//line n1Vehicle (int x) {this distance = x;}public void increSpeed(int time) {//line n2int timeTravel = time;//line n3class 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.
