READ Free Dumps For Oracle- 1z0-804
| Question ID 21451 | Given:
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class NameList {
public static void main(String[] args) {
List<String> nameList = new ArrayList<>(3);
nameList.add("John Adams");
nameList.add("George Washington");
nameList.add("Thomas Jefferson");
Collections.sort(nameList);
for (String name : nameList) {
System.out.println(name);
}
}
}
What is the result?
|
| Option A | John Adams
George Washington
Thomas Jefferson
|
| Option B | George Washington
John Adams
Thomas Jefferson
|
| Option C | Thomas Jefferson
John Adams
George Washington
|
| Option D | An exception is thrown at runtime
|
| Option E | Compilation fails
|
| Correct Answer | B |
Explanation Explanation: The program compiles and runs fine. At runtime the NameList is built and then sorted by natural Order (String >> alphabetically).
| Question ID 21452 | Given:
import java.util.ArrayDeque;
import java.util.Deque;
public class Counter {
public static void main(String[] args) {
Deque<String> deq = new ArrayDeque<String>(2);
deq.addFirst("one");
deq.addFirst("two");
deq.addFirst("three"); // Line 9
System.out.print(deq.pollLast());
System.out.print(deq.pollLast());
System.out.print(deq.pollLast()); // Line 12
}
}
What is the result?
|
| Option A | An exception is thrown at runtime on line 9.
|
| Option B | An exception is thrown at runtime on line 12
|
| Option C | onetwonull
|
| Option D | onetwothree
|
| Option E | twoonenull
|
| Option F | threetwoone
|
| Correct Answer | D |
Explanation Explanation: addFirst void addFirst(E e) Inserts the specified element at the front of this deque if it is possible to do so immediately without violating capacity restrictions. When using a capacity-restricted deque, it is generally preferable to use method offerFirst (E). pollLast E pollLast() Retrieves and removes the last element of this deque, or returns null if this deque is empty. Returns: the tail of this deque, or null if this deque is empty