hybris tech screening - 问卷调查调研模板

Q1:1. Which methods are utilized to control the access to an object in multi threaded programming?

Asynchronized methods

Synchronized methods

Serialized methods

None of above

Q2:2. Constructor has return type

TRUE

FALSE

Q3:3. Which of the following is a valid declaration of an object of class Box?

Box obj = new Box();

Box obj = new Box;

obj = new Box();

new Box obj;

Q4:4. Which of the following statements is correct?

Public method is accessible to all other classes in the hierarchy

Public method is accessible only to subclasses of its parent class

Public method can only be called by object of its class.

Public method can be accessed by calling object of the public class.

Q5:5. Which cannot directly cause a thread to stop executing?

Calling the SetPriority() method on a Thread object.

Calling the wait() method on an object.

Calling notify() method on an object.

Calling read() method on an InputStream object.

Q6:6. three guarantee that a thread will leave the running state? 1. yield()2. wait()3. notify()4. notifyAll()5. sleep(1000)6. aLiveThread.join()7. Thread.killThread()

1, 2 and 4

2, 5 and 6

3, 4, and 7

4, 5 and 7

Q7:7. public void test(int x){ int odd = 1; if(odd) { System.out.println("odd"); } else { System.out.println("even"); }} Which statement is true?

Compilation fails.

odd will always be output.

even will always be output.

odd will be output for odd values of x, and "even" for even values.

Q8:8.public class While { public void loop() { int x= 0; while ( 1 ) /* Line 6 */ { System.out.print("x plus one is " + (x + 1)); /* Line 8 */ } } } Which statement is true?

There is a syntax error on line 1.

There are syntax errors on lines 1 and 6.

There are syntax errors on lines 1, 6, and 8.

There is a syntax error on line 6.

Q9:9.class Bar { } class Test { Bar doBar() { Bar b = new Bar(); /* Line 6 */ return b; /* Line 7 */ } public static void main (String args[]) { Test t = new Test(); /* Line 11 */ Bar newBar = t.doBar(); /* Line 12 */ System.out.println("newBar"); newBar = new Bar(); /* Line 14 */ System.out.println("finishing"); /* Line 15 */ } } At what point is the Bar object, created on line 6, eligible for garbage collection?

after line 12

after line 14

after line 7, when doBar() completes

after line 15, when main() completes

Q10:10.try { int x = 0; int y = 5 / x; } catch (Exception e) { System.out.println("Exception"); } catch (ArithmeticException ae) { System.out.println(" Arithmetic Exception"); } System.out.println("finished"); What will be the output of the program?

finished

Exception

Compilation fails

Arithmetic Exception

Q11:11.You want subclasses in any package to have access to members of a superclass. Which is the most restrictive access that accomplishes this objective?

public

private

protected

transient

Q12:12.interface Base { boolean m1 (); byte m2(short s); } which two code fragments will compile? 1. interface Base2 implements Base {} 2. abstract class Class2 extends Base { public boolean m1() { return true; }} 3. abstract class Class2 implements Base {} 4. abstract class Class2 implements Base { public boolean m1() { return (7 4); }} 5. abstract class Class2 implements Base { protected boolean m1() { return (5 7) }}

1 and 2

2 and 3

3 and 4

1 and 5

Q13:13.Suppose that you would like to create an instance of a new Map that has an iteration order that is the same as the iteration order of an existing instance of a Map. Which concrete implementation of the Map interface should be used for the new instance?

TreeMap

HashMap

LinkedHashMap

The answer depends on the implementation of the existing instance.

Q14:14. You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order. Which interface provides that capability?

java.util.Map

java.util.Set

java.util.List

java.util.Collection

Q15:15. Which is valid declaration of a float?

float f = 1F;

float f = 1.0;

float f = "1";

float f = 1.0d;

Q16:16. Which is true about an anonymous inner class?

It can extend exactly one class and implement exactly one interface.

It can extend exactly one class and can implement multiple interfaces.

It can extend exactly one class or implement exactly one interface.

It can implement multiple interfaces regardless of whether it also extends a class.

Q17:17. A UML Class Diagram does not sufficiently describe an OO system because:

It does not show interfaces

It does not show composition

It does not show class relationships

It is a static diagram

Q18:18. The difference between aggregation and composition is:

They are both the same

Composition is an "owning" relationship

Aggregation is an "owning" relationship

Composition groups like objects, aggregation groups family's of objects

Q19:19. Java 5 Generics:

Ensure compile-time type safety

Ensure compile and runtime type safety

Have nothing to do with type safety

Are useful only for Java collections

Q20:20. What is the most significant cause of concern for Java Annotations?

You cannot create your own annotations

They cause additional classes to be loaded, slowing performance

The represent a tight coupling

There are no significant drawbacks

Q21:21. NoSql database performance can be restricted by:

Access via services, which are slower than direct calls .

The CAP theorum

The DAP theorum

Both c and d.

Q22:22. Cloud computing:

is always hosted by a third party like Amazon, Google or Rackspace

requires NoSQL databases

cannot be used to host Java Web Applications

achieves economy of scale