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Oracle 1z1-809 exam consists of 85 multiple-choice questions that must be completed within 150 minutes. 1z0-809 exam is available in several languages and can be taken online or at a testing center. Candidates who pass the exam will receive the Oracle Certified Professional, Java SE 8 Programmer certification, which is recognized by employers worldwide as a sign of expertise in Java programming. Passing 1z0-809 Exam is not easy, but it is worth the effort for those who want to advance their careers in Java development.
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Which two reasons should you use interfaces instead of abstract classes? (Choose two.)
A. You want to declare non-static on non-final fields.
B. You expect that unrelated classes would implement your interfaces.
C. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
D. You want to take advantage of multiple inheritance of type.
E. You want to share code among several closely related classes.
Answer: B,D
Explanation:
References:
NEW QUESTION # 190
Given:
Your design requires that:
fuelLevel of Engine must be greater than zero when the start()method is invoked.
The code must terminate if fuelLevelof Engineis less than or equal to zero.
Which code fragment should be added at line n1to express this invariant condition?
A. assert fuelLevel > 0: "Impossible fuel" ;
B. assert (fuelLevel) : "Terminating...";
C. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
D. assert fuelLevel < 0: System.exit(0);
Answer: D
NEW QUESTION # 191
Given the code fragment:
public static void main (String [ ] args) throws IOException {
BufferedReader br = new BufferedReader (new InputStremReader
(System.in));
System.out.print ("Enter GDP: ");
//line 1
}
Which code fragment, when inserted at line 1, enables the code to read the GDP from the user?
A. int GDP = Integer.parseInt (br.readline());
B. int GDP = Integer.parseInt (br.next());
C. int GDP = br.read();
D. int GDP = br.nextInt();
Answer: A
NEW QUESTION # 192
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?
A. z b d e j
B. j z e b d
C. d b e z j
D. A compilation error occurs.
Answer: B
NEW QUESTION # 193
Given the code fragments:
and
What is the result?
A. France
Not Found
B. Optional [France]
Optional [NotFound]
C. Optional[France]
Not Found
D. France
Optional[NotFound]
Answer: A
NEW QUESTION # 194
......
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