Free Oracle 1Z0-809 Exam Practice Questions

Given:

class Student {

String course, name, city;

public Student (String name, String course, String city) {

this.course = course; this.name = name; this.city = city;

}

public String toString() {

return course + '':'' + name + '':'' + city;

}

public String getCourse() {return course;}

public String getName() {return name;}

public String getCity() {return city;}

and the code fragment:

List stds = Arrays.asList(

new Student (''Jessy'', ''Java ME'', ''Chicago''),

new Student (''Helen'', ''Java EE'', ''Houston''),

new Student (''Mark'', ''Java ME'', ''Chicago''));

stds.stream()

.collect(Collectors.groupingBy(Student::getCourse))

.forEach(src, res) -> System.out.println(scr));

What is the result?

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 products = new ArrayList <> (Arrays.asList(new Product(1, 10),

new Product (2, 30),

new Product (3, 20));

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?

Given the code fragment:

List doubles = Arrays.asList (100.12, 200.32);

DoubleFunction funD = d --> d + 100.0;

doubles.stream (). forEach (funD); // line n1

doubles.stream(). forEach(e --> System.out.println(e)); // line n2

What is the result?

Given the code fragments:

class ThreadRunner implements Runnable {

public void run () { System.out.print (''Runnable'') ; }

}

class ThreadCaller implements Callable {

Public String call () throws Exception {return ''Callable''; )

}

and

ExecutorService es = Executors.newCachedThreadPool ();

Runnable r1 = new ThreadRunner ();

Callable c1 = new ThreadCaller ();

// line n1

es.shutdown();

Which code fragment can be inserted at line n1 to start r1 and c1 threads?

Given the definition of the Employee class:

and this code fragment:

What is the result?