Online Access Free 1Z0-853 Practice Test

Given:
13.
public static void search(List<String> list) {
14.
list.clear();
15.
list.add("b");
16.
list.add("a");
17.
list.add("c");
18.
System.out.println(Collections.binarySearch(list, "a"));
19.
}
What is the result of calling search with a valid List implementation?

• A.c
• B.1
• C.a
• D.b
• E.The result is undefined.
• F.2
• G.0

Given:
10. interface Jumper { public void jump(); } ...
20. class Animal {} ...
30.
class Dog extends Animal {
31.
Tail tail;
32.
} ...
40.
class Beagle extends Dog implements Jumper{
41.
public void jump() {} 42. } ...
50.
class Cat implements Jumper{
51.
public void jump() {}
52.
}
Which three are true? (Choose three.)

• A.Cat is-a Animal
• B.Beagle has-a Tail
• C.Cat is-a Jumper
• D.Beagle has-a Jumper
• E.Cat has-a Animal
• F.Dog is-a Jumper
• G.Dog is-a Animal

Which two statements are true about has-a and is-a relationships? (Choose two.)

• A.Inheritance represents a has-a relationship.
• B.Inheritance represents an is-a relationship.
• C.Interfaces must be used when creating a has-a relationship.
• D.Instance variables can be used when creating a has-a relationship.

Given:
11.
rbo = new ReallyBigObject();
12.
// more code here
13.
rbo = null;
14.
/* insert code here */
Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?

• A.System.freeMemory();
• B.Runtime.getRuntime().growHeap();
• C.System.gc();
• D.Runtime.gc();
• E.Runtime.getRuntime().freeMemory();

Given:
11.
public static void main(String[] args) {
12.
try {
13.
args = null;
14.
args[0] = "test";
15.
System.out.println(args[0]);
16.
} catch (Exception ex) {
17.
System.out.println("Exception");
18.
} catch (NullPointerException npe) {
19.
System.out.println("NullPointerException");
20.
}
21.
}
What is the result?

• A.Compilation fails.
• B.NullPointerException
• C.test
• D.Exception