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Earning the Oracle 1z0-809 Certification is a valuable asset for Java developers, as it demonstrates their advanced skills and knowledge in Java programming. It also increases their marketability and opens up new career opportunities. If you are a Java developer looking to take your skills to the next level, the Oracle 1z0-809 exam is definitely worth considering.
The Oracle 1z0-809 exam consists of 85 multiple-choice questions and lasts for 2.5 hours. It covers a wide range of topics, including Java Class Design, Generics and Collections, Lambda Expressions, Java I/O Fundamentals, Java Concurrency, and Java Database Connectivity (JDBC). Candidates are required to have a deep understanding of these topics, as well as hands-on experience with Java programming.
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Oracle Java SE 8 Programmer II Sample Questions (Q144-Q149):
NEW QUESTION # 144
Given the code fragment:
List<String> codes = Arrays.asList ("DOC", "MPEG", "JPEG");
codes.forEach (c -> System.out.print(c + " "));
String fmt = codes.stream()
.filter (s-> s.contains ("PEG"))
.reduce((s, t) -> s + t).get();
System.out.println(" " + fmt);
What is the result?
Answer: C
NEW QUESTION # 145
Given:
1. abstract class Shape {
2. Shape ( ) { System.out.println (“Shape”); }
3. protected void area ( ) { System.out.println (“Shape”); }
4. }
5.
6. class Square extends Shape {
7. int side;
8. Square int side {
9. /* insert code here */
10. this.side = side;
11. }
12. public void area ( ) { System.out.println (“Square”); }
13. }
14. class Rectangle extends Square {
15. int len, br;
16. Rectangle (int x, int y) {
17. /* insert code here */
18. len = x, br = y;
19. }
20. void area ( ) { System.out.println (“Rectangle”); }
21. }
Which two modifications enable the code to compile?
Answer: A,C
NEW QUESTION # 146
Given the code fragment:
List<String> colors = Arrays.asList("red", "green", "yellow");
Predicate<String> test = n - > {
System.out.println("Searching...");
return n.contains("red");
};
colors.stream()
. filter(c -> c.length() > 3)
. allMatch(test);
What is the result?
Answer: D
NEW QUESTION # 147
Given:
public class product { int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + ":" + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
Answer: C
NEW QUESTION # 148
Given the code fragments :
and
What is the result?
Answer: D
NEW QUESTION # 149
......
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