All the Oracle 1Z0-851 practice questions that with precise as well as verified answers are produced and updated simply by our innovative professionals in the industry of world wide web. Taking the actual Oracle 1Z0-851 simulated test you will get a large mark that guarantee the success. Our own Oracle Oracle 1Z0-851 braindumps have excellent value as well as high quality which promise you a passing score, or you will get the purchasing service fees back. While if you dont desire to the refund, we are able to send anyone another Oracle 1Z0-851 dumps regarding free. All of us hope you get from the Oracle certification exam smoothly.

2021 Oct actual test 1z0-851:

Q91. Given: public class NamedCounter {

private final String name;

private int count;

public NamedCounter(String name) { this.name = name; }

public String getName() { return name; }

public void increment() { count++; }

public int getCount() { return count; }

public void reset() { count = 0; }

}

Which three changes should be made to adapt this class to be used safely by multiple threads? (Choose

three.)

A. declare reset() using the synchronized keyword

B. declare getName() using the synchronized keyword

C. declare getCount() using the synchronized keyword

D. declare the constructor using the synchronized keyword

E. declare increment() using the synchronized keyword

Answer: ACE


Q92. Given:

1. public class TestString1 {

2. public static void main(String[] args) {

3. String str = "420";

4. str += 42;

5. System.out.print(str);

6. }

7. }

What is the output?

A. 42

B. 420

C. 462

D. 42042

E. Compilation fails.

F. An exception is thrown at runtime.

Answer: D


Q93. Given:

12. import java.util.*;

13. public class Explorer1 {

14. public static void main(String[] args) {

15. TreeSet<Integer> s = new TreeSet<Integer>();

16. TreeSet<Integer> subs = new TreeSet<Integer>();

17. for(int i = 606; i < 613; i++)

18. if(i%2 == 0) s.add(i);

19. subs = (TreeSet)s.subSet(608, true, 611, true);

20. s.add(609);

21. System.out.println(s + " " + subs);

22. }

23. }

What is the result?

A. Compilation fails.

B. An exception is thrown at runtime.

C. [608, 609, 610, 612] [608, 610]

D. [608, 609, 610, 612] [608, 609, 610]

E. [606, 608, 609, 610, 612] [608, 610]

F. [606, 608, 609, 610, 612] [608, 609, 610]

Answer: F


Q94. Given:

1. public class Target {

2. private int i = 0;

3. public int addOne(){

4. return ++i;

5. }

6. } And:

1. public class Client {

2. public static void main(String[] args){

3. System.out.println(new Target().addOne());

4. }

5. }

Which change can you make to Target without affecting Client?

A. Line 4 of class Target can be changed to return i++;

B. Line 2 of class Target can be changed to private int i = 1;

C. Line 3 of class Target can be changed to private int addOne(){

D. Line 2 of class Target can be changed to private Integer i = 0;

Answer: D


Q95. Given:

22. StringBuilder sb1 = new StringBuilder("123");

23. String s1 = "123";

24. // insert code here

25. System.out.println(sb1 + " " + s1);

Which code fragment, inserted at line 24, outputs "123abc 123abc"?

A. sb1.append("abc"); s1.append("abc");

B. sb1.append("abc"); s1.concat("abc");

C. sb1.concat("abc"); s1.append("abc");

D. sb1.concat("abc"); s1.concat("abc");

E. sb1.append("abc"); s1 = s1.concat("abc");

F. sb1.concat("abc"); s1 = s1.concat("abc");

G. sb1.append("abc"); s1 = s1 + s1.concat("abc");

H. sb1.concat("abc"); s1 = s1 + s1.concat("abc");

Answer: E


2passeasy.com

Avant-garde 1z0-851 latest dumps:

Q96. Given:

11. public void genNumbers() {

12. ArrayList numbers = new ArrayList();

13. for (int i=0; i<10; i++) {

14. int value = i * ((int) Math.random());

15. Integer intObj = new Integer(value);

16. numbers.add(intObj);

17. }

18. System.out.println(numbers);

19. }

Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for

garbage collection?

A. Line 16

B. Line 17

C. Line 18

D. Line 19

E. The object is NOT a candidate for garbage collection.

Answer: D


Q97. Click the Exhibit button.

Given:

25. A a = new A();

26. System.out.println(a.doit(4, 5));

What is the result?


A. Line 26 prints "a" to System.out.

B. Line 26 prints "b" to System.out.

C. An exception is thrown at line 26 at runtime.

D. Compilation of class A will fail due to an error in line 6.

Answer: A


Q98. Given:

10: public class Hello {

11: String title;

12: int value;

13: public Hello() {

14: title += " World";

15: }

16: public Hello(int value) {

17: this.value = value;

18: title = "Hello";

19: Hello();

20: }

21: }

and:

30: Hello c = new Hello(5);

31: System.out.println(c.title);

What is the result?

A. Hello

B. Hello World

C. Compilation fails.

D. Hello World 5

E. The code runs with no output.

F. An exception is thrown at runtime.

Answer: C


Q99. Given:

1. public class BuildStuff {

2. public static void main(String[] args) {

3. Boolean test = new Boolean(true);

4. Integer x = 343;

5. Integer y = new BuildStuff().go(test, x);

6. System.out.println(y);

7. }

8. int go(Boolean b, int i) {

9. if(b) return (i/7);

10. return (i/49);

11. }

12. }

What is the result?

A. 7

B. 49

C. 343

D. Compilation fails.

E. An exception is thrown at runtime.

Answer: B


Q100. Given:

11. class Mammal { }

12.

13. class Raccoon extends Mammal {

14. Mammal m = new Mammal();

15. }

16.

17. class BabyRaccoon extends Mammal { } Which four statements are true? (Choose four.)

A. Raccoon is-a Mammal.

B. Raccoon has-a Mammal.

C. BabyRaccoon is-a Mammal.

D. BabyRaccoon is-a Raccoon.

E. BabyRaccoon has-a Mammal.

F. BabyRaccoon is-a BabyRaccoon.

Answer: ABCF