The new Oracle 1Z0-809 exam questions cover real topics from the latest Java SE 8 Programmer II release. Each question helps you review dificult key areas and understand how the Oracle Java system works in real scenarios. Practice regularly with updated version of 1Z0 809 dumps, focus on weak points, prepare for your desired test effectively and pass your Oracle certification exam confidently on your first try.
You want to create a singleton class by using the Singleton design pattern. Which two statements enforce the singleton nature of the design? (Choose two.)
Given code of Test.java file:
1. package com.udayan.ocp;
2.
3. import java.util.ArrayDeque;
4. import java.util.Deque;
5.
6. public class Test {
7. public static void main(String[] args) {
8. Deque
9. deque.push(new Boolean("abc"));
10. deque.push(new Boolean("tRuE"));
11. deque.push(new Boolean("FALSE"));
12. deque.push(true);
13. System.out.println(deque.pop() + ":" + deque.peek() + ":" + deque.size());
14. }
15. }
What will be the result of compiling and executing Test class?
Given code of Test.java file:
1. package com.udayan.ocp;
2.
3. public class Test {
4. private static void div(int i, int j) {
5. try {
6. System.out.println(i / j);
7. } catch(ArithmeticException e) {
8. throw (RuntimeException)e;
9. }
10. }
11. public static void main(String[] args) {
12. try {
13. div(5, 0);
14. } catch(ArithmeticException e) {
15. System.out.println("AE");
16. } catch(RuntimeException e) {
17. System.out.println("RE");
18. }
19. }
20. }
What will be the result of compiling and executing Test class?
Consider the code of Greet.java file:
1. package com.udayan.ocp;
2.
3. public final class Greet {
4. private String msg;
5. public Greet(String msg) {
6. this.msg = msg;
7. }
8.
9. public String getMsg() {
10. return msg;
11. }
12.
13. public void setMsg(String msg) {
14. this.msg = msg;
15. }
16. }
Is Greet class an immutable class?
Given code of Test.java file:
package com.udayan.ocp;
import java.util.concurrent.*;
public class Test {
public static void main(String[] args) throws InterruptedException, ExecutionException {
ExecutorService es = Executors.newSingleThreadExecutor();
Future
System.out.println(f.get());
es.shutdown();
}
}
What will be the result of compiling and executing Test class?
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