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1Z0-809 Exam Questions & Answers

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1Z0-809 Exam Questions & Answers

Vendor: Oracle

Certifications: Oracle Database

Exam Code: 1Z0-809

Exam Name: Java SE 8 Programmer II

Updated: Dec 15, 2024

Q&As: 207

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1Z0-809 Online Practice Questions and Answers

Questions 1

Given the definition of the Vehicle class:

class Vehicle {

String name;

void setName (String name) {

this.name = name;

}

String getName() {

return name;

}

}

Which action encapsulates the Vehicle class?

A. Make the Vehicle class public.

B. Make the name variable public.

C. Make the setName method public.

D. Make the name variable private.

E. Make the setName method private.

F. Make the getName method private.

Show Answer
Questions 2

Given the code fragments:

class Caller implements Callable {

String str;

public Caller (String s) {this.str=s;}

public String call()throws Exception { return str.concat ("Caller");}

}

class Runner implements Runnable {

String str;

public Runner (String s) {this.str=s;}

public void run () { System.out.println (str.concat ("Runner"));}

}

and

public static void main (String[] args) InterruptedException, ExecutionException {

ExecutorService es = Executors.newFixedThreadPool(2);

Future f1 = es.submit (new Caller ("Call"));

Future f2 = es.submit (new Runner ("Run"));

String str1 = (String) f1.get();

String str2 = (String) f2.get(); //line n1

System.out.println(str1+ ":" + str2);

}

What is the result?

A. The program prints: Run Runner Call Caller : null And the program does not terminate.

B. The program terminates after printing: Run Runner Call Caller : Run

C. A compilation error occurs at line n1.

D. An Execution is thrown at run time.

Show Answer
Questions 3

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?

A. A compilation error occurs.

B. Java EE Java ME

C. [Java EE: Helen:Houston] [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]

D. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago] [Java EE: Helen:Houston]

Show Answer More Questions

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