Question

Hi all,

I'm studying for a test for my Java class that coming up on Tuesday, and I would love it if someone could look over my answer. Can someone give me some feedback on the wrong one I get wrong? I really need to get it right for the upcoming test.

Here my prep test:

Which one statement is true"

Question1

1. All objects that are eligible for garbage collection will be removed from the heap by the garbage collector.
2. Objects with more than one reference will never be garbage collected.
3. Objects from a class with the finalize() method overridden will never be garbage collected.
4. Objects instantiated within method local inner classes are placed in the garbage collectible heap.
5. Once an overridden finalize() method is invoded, there is no way to make that object ineligible for garbage collection.

choices:

1

2

3

4

5

I choose: 1

Question 2

1. void doSomething() {
2. X x = doStuff(new X() );
3. X y = doStuff(x);

28  x = null;

1. y = null;
2. }
3. X doStuff(X x){

32   return doStuff2(x);

1. }

After which line of code is the object created on line 26 eligible for garbage collection?

1. After line 28
2. After line 29
3. After line 30
4. The object will not become eligible
5. It is not possible to know from this code.

choices:

1

2

3

4

5

I choose: 3

Question 3

Which Man class properly represents the relationship "Man has a best

friend who is a Dog"?

1. class Man extends Dog { }
2. class Man implements Dog { }
3. class Man { private BestFriend dog; }
4. class Man { private Dog bestFriend; }
5. class Man { private Dog<bestFriend> }
6. class Man { private BestFriend<dog> }

choices:

1

2

3

4

5

6

I choose: 4

Question 4

Given:

1. public class Test {
2. public static void main(String [] args) {
3. int x =5;
4. boolean b1 = true;
5. boolean b2 = false;

16.

17.if((x==4) && !b2)

1. System.out.print("l ");
2. System.out.print("2 ");
3. if ((b2 = true) && b1)
4. System.out.print("3 ");
5. }
6. }

What is the result?

1. 2
2. 3
3. 1 2
4. 2 3
5. 1 2 3
6. Compilation fails.
7. Au exceptional is thrown at runtime.

choices:

1

2

3

4

5

6

7

I choose: 7

Question 5

When the method pop() is used in the stack. The item is removed from the stack at what location.

choices:

A.Top of Stack

B.Bottom of Stack

C.Need Specific Index

D.Middle of Stack

I choose:B

Question 6

When the method push() is used in the stack. The item is inserted into what position.

choices:

A.Middle of Stack

B.Correct Index Is Needed

C.Top of Stack

D.Bottom of Stack

I choose: B

Question 7

When the method add is used in a queue. The item is added to what location of the queue.

choices:

A.Specific index is required

B.middle of queue

C.head of queue

D.tail of queue

I choose:A

Question 8

When the method remove is used in a queue. The item is removed from what location of the queue.

choices:

A.Specific index is required

B.Middle of queue

C.Head of Queue

D.Tail of Queue

I choose:C

Question 9

Which of the following data structures is considered FILO (FIRST IN LAST OUT):

1. Queue

2. Linked List

3. Tree

4. Stack

choices:

1

2

3

4

I choose: 2

Question 10

String d = "beekeeper";

d.substring(1,7);

d = "w" + d;

d.replace('e', 'y');

System.out.println(d);

What is the result?

1. wbeebeekeep
2. wbeekeeper
3. wbeekeepe
4. weekeeper
5. wbyykyyper
6. Compilation fails
7. An exception is thrown

choices:

1

2

3

4

5

6

7

I choose: 5

Answer 1

1) correct option 5

Once an overridden finalize() method is invoded, there is no way to make that object ineligible for garbage collection.

2) after line 28

3) class Man { private Dog bestFriend; }

4 ) 2 3

5) A.Top of Stack

6) C.Top of Stack

7) D.tail of queue

8)  

head of queue

9) 4. Stack

10)wbeekeeper