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Guide for Java SE 8 Programmer II (also available in CHS for Taiwan)

Quiz Java SE 8 Programmer II (also available in CHS for Taiwan)

Free Test
/ 10

Quiz

1/10
When you are building an Immutable Object which of the following statements are true.

I. Make the class final.
II. Make the constructor private
III. Don't provide methods that modify fields or objects referred to by fields.
IV. Don't allow subclasses to override methods.
V. Make all fields final and private.
Select the answer
1 correct answer
A.
Only I,III and V.
B.
Only III,IV and V.
C.
Only II,III and IV.
D.
Only III,IV.
E.
All of Above.

Quiz

2/10
Consider the following class:

1. public final class Program {
2.
3. final private String name;
4.
5. Program (String name){
6. this.name = name;
7.
8. getName();
9. }
10.
11. //code here
12.
13. }

Which of the following code will make an instance of this class immutable.
Select the answer
2 correct answers
A.
public String getName(){return name;}
B.
public String getName(String value){ name=value; return value;}
C.
private String getName(){return name+"a";}
D.
public final String getName(){return name+="a";}
E.
All of Above.

Quiz

3/10
Consider the following class:

1. final class A{
2. private String s;
3. public A(String s){
4. this.s = s;
5. }
6. public String toString(){ return s; };
7. public void setA(String a){ this.s+= a; };
8. }
9.
10. public final class Immutable {
11. private final A a;
12. public Immutable(A a){
13. this.a = a;
14. }
15. public String toString(){ return a.toString();};
16. public static void main(String[] args){
17.
18. A a = new A("Bye");
19. Immutable im = new Immutable(a);
20. System.out.print(im);
21.
22. a.setA(" bye");
23. System.out.print(im);
24. }
25. }

What will be the result?
Select the answer
1 correct answer
A.
Bye bye
B.
Bye Bye
C.
ByeBye bye
D.
Compilation fail
E.
None of Above

Quiz

4/10
Consider the following class:

1. class A{
2. public int method(){ return 0;}
3. }
4.
5. public class SubA extends A{
6. //code here
7. }

which of the following is a correct method overloading?
Select the answer
1 correct answer
A.
public int method(){ return 1;}
B.
public void method(){ }
C.
public int method() throws Exception { throw new FileNotFoundException(); }
D.
public int method(String s){ return 0;}

Quiz

5/10
Consider the following class:

1. class SuperClass{
2. protected void method1(){
3. System.out.print("M SuperC");
4. }
5. }
6.
7. class SubClass extends SuperClass{
8. private void method1(){
9. System.out.print("M SubC");
10. }
11.
12. public static void main(String[] args){
13. SubClass sc = new SubClass();
14. sc.method1();
15. }
16. }
Select the answer
1 correct answer
A.
M SubC.
B.
M SuperC.
C.
M SuperCM SubC.
D.
Compilation fails.
E.
None of above.

Quiz

6/10
Given the following class:

1. // Code Here
2. @Override
3. public void run() {
4. for(int i = 0;i<10;i++)
5. System.out.print(i);
6. }
7. }
8.
9. public class Test {
10. public static void main(String args[]) {
11. Task t = new Task();
12. Thread thread = new Thread(t);
13. thread.start();
14. }
15. }

Which of the following lines will give the result:
0123456789
Select the answer
1 correct answer
A.
class Task extends Runnable {
B.
class Task implements Runnable {
C.
class Task implements Thread {
D.
class Task extends Thread {
E.
None Of Above

Quiz

7/10
Given the following class:
1. public class Test {
2. public static void main(String args[]) {
3. //Code Here
4. Thread thread = new Thread(r);
5. thread.start();
6. }
7. }

Which of the following lines will give a valid Thread creation:
Select the answer
1 correct answer
A.
Thread r = () -> System.out.println("Running");
B.
Run r = () -> System.out.println("Running");
C.
Runnable r = () -> System.out.println("Running");
D.
Executable r = () -> System.out.println("Running");
E.
None Of Above

Quiz

8/10
Given the following class:

1. public class Test {
2. public static void main(String args[]) {
3. Runnable r2 = new Runnable() {
4. @Override
5. public void run() {
6. System.out.print("Running");
7. }
8. };
9.
10. Runnable r = new Runnable() {
11. @Override
12. public void run() {
13. System.out.print("Running1");
14. Thread thread = new Thread(r2);
15. thread.start();
16. }
17. };
18.
19. System.out.print("Running2");
20. Thread thread = new Thread(r);
21. thread.start();
22. };
23. }

What will be the result?
Select the answer
1 correct answer
A.
Running2Running1Running
B.
RunningRunning1Running2
C.
RunningRunning1
D.
Running
E.
Compilation fails

Quiz

9/10
Given the following class:

1. public class Program {
2.
3. public static void main(String[] args){
4.
5. Callable<String> c = new Callable<String>(){
6. @Override
7. public String call() throws Exception {
8. String s="";
9. for (int i = 0; i < 10; i++) { s+=i;}
10. return s;
11. }
12. };
13.
14. ExecutorService executor = Executors.newSingleThreadExecutor();
15. Future<String> future = executor.submit(c);
16. try {
17. String result = future.wait();
18. System.out.println(result);
19. } catch (ExecutionException e) {
20. e.printStackTrace();
21. }
22. }
23. }

What will be the result?
Select the answer
1 correct answer
A.
0123456789
B.
12345678910
C.
Unhandled exception type InterruptedException al line 17
D.
The code will not compile because of line 5.
E.
The code will not compile because of line 17.

Quiz

10/10
Which of the followings are valid Executors factory methods

I. ExecutorService es1 = Executors.newSingleThreadExecutor(4);
II. ExecutorService es1 = Executors.newFixedThreadPool(10);
III. ExecutorService es1 = Executors.newScheduledThreadPool();
IV. ExecutorService es1 = Executors.newScheduledThreadPool(10);
V. ExecutorService es1 = Executors.newSingleThreadScheduledExecutor();
Select the answer
1 correct answer
A.
Only I, II, III.
B.
Only II, III, IV, V.
C.
Only I, IV, V.
D.
Only II, IV, V.
E.
All.
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  • Quiz name:Java SE 8 Programmer II (also available in CHS for Taiwan)
  • Total number of questions:420
  • Number of questions for the test:50
  • Pass score:80%

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