Quiz about Exam Dumps, Java, Java-1Z0-809

Question 1

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.

Accepted Answer

Only III,IV and V.

Answer

Only I,III and V.

Answer

Only II,III and IV.

Answer

Only III,IV.

Answer

All of Above.

Question 2

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.

Accepted Answer

public String getName(){return name;}

Accepted Answer

private String getName(){return name+\"a";}

Answer

public String getName(String value){ name=value; return value;}

Answer

public final String getName(){return name+=\"a";}

Answer

All of Above.

Question 3

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?

Accepted Answer

ByeBye bye

Answer

Bye bye

Answer

Bye Bye

Answer

Compilation fail

Answer

None of Above

Question 4

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?

Accepted Answer

public int method(String s){ return 0;}

Answer

public int method(){ return 1;}

Answer

public void method(){ }

Answer

public int method() throws Exception { throw new FileNotFoundException();  }

Question 5

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.	}

Accepted Answer

Compilation fails.

Answer

M SubC.

Answer

M SuperC.

Answer

M SuperCM SubC.

Answer

None of above.

Question 6

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

Accepted Answer

class Task implements Runnable {

Answer

class Task extends Runnable {

Answer

class Task implements Thread {

Answer

class Task extends Thread {

Answer

None Of Above

Question 7

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:

Accepted Answer

Runnable r = () -> System.out.println(\"Running");

Answer

Thread r = () -> System.out.println(\"Running");

Answer

Run r = () -> System.out.println(\"Running");

Answer

Executable r = () -> System.out.println(\"Running");

Answer

None Of Above

Question 8

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?

Accepted Answer

Running2Running1Running

Answer

RunningRunning1Running2

Answer

RunningRunning1

Answer

Running

Answer

Compilation fails

Question 9

Given the following class: 1. public class Program { 2. 3. public static void main(String[] args){ 4. 5. Callable c = new Callable(){ 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 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?

Accepted Answer

The code will not compile because of line 17.

Answer

0123456789

Answer

12345678910

Answer

Unhandled exception type InterruptedException al line 17

Answer

The code will not compile because of line 5.

Question 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();

Accepted Answer

Only II, IV, V.

Answer

Only I, II, III.

Answer

Only II, III, IV, V.

Answer

Only I, IV, V.

Answer

All.

Quiz Java-1Z0-809

Free Test - Simulator Java-1Z0-809

Java-1Z0-809 Practice test unlocks all online simulator questions

What to expect from our Java-1Z0-809 practice tests and how to prepare for any exam?