Online Access Free 1Z0-851 Practice Test

Given:
1.public class GC {
2.private Object o;
3.private void doSomethingElse(Object obj) { o = obj; }
4.public void doSomething() {
5.Object o = new Object();
6.doSomethingElse(o);
7.o = new Object();
8.doSomethingElse(null);
9.o = null;
10.}
11.}
When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?

• A.Line 8
• B.Line 5
• C.Line 10
• D.Line 6
• E.Line 9
• F.Line 7

Click the Exhibit button. Given: ClassA a = new ClassA(); a.methodA(); What is the result?

• A.The code runs with no output.
• B.ClassC is displayed.
• C.An exception is thrown at runtime.
• D.Compilation fails.

Given:
11.public class ItemTest {
12.private final int id;
13.public ItemTest(int id) { this.id = id; }
14.public void updateId(int newId) { id = newId; }
15.16.
public static void main(String[] args) {
17.ItemTest fa = new ItemTest(42);
18.fa.updateId(69);
19.System.out.println(fa.id);
20.}
21.}
What is the result?

• A.A new ItemTest object is created with the preferred value in the id attribute.
• B.An exception is thrown at runtime.
• C.Compilation fails.
• D.The attribute id in the ItemTest object remains unchanged.
• E.The attribute id in the ItemTest object is modified to the new value.

DRAG DROP
Click the Task button.

Correct Answer:

Given:
1.public class Donkey {
2.public static void main(String[] args) {
3.boolean assertsOn = false;
4.assert (assertsOn) : assertsOn = true;
5.if(assertsOn) {
6.System.out.println("assert is on");
7.}
8.}
9.}
If class Donkey is invoked twice, the first time without assertions enabled, and the second time
with assertions enabled, what are the results?

• A.no output
  assert is on
• B.assert is on
  An AssertionError is thrown.
• C.no output
  An AssertionError is thrown.
• D.assert is on
• E.no output