Online Access Free 1Z0-851 Practice Test

Given: public class NamedCounter {
private final String name;
private int count;
public NamedCounter(String name) { this.name = name; }
public String getName() { return name; }
public void increment() { count++; }
public int getCount() { return count; }
public void reset() { count = 0; }
} Which three changes should be made to adapt this class to be used safely by multiple threads? (Choose three.)

• A.declare the constructor using the synchronized keyword
• B.declare getName() using the synchronized keyword
• C.declare reset() using the synchronized keyword
• D.declare getCount() using the synchronized keyword
• E.declare increment() using the synchronized keyword

Given:
2.public class Hi {
3.void m1() { }
4.protected void() m2 { }
5.}
6.class Lois extends Hi {
7.// insert code here
8.}
Which four code fragments, inserted independently at line 7, will compile? (Choose four.)

• A.private void m2() { }
• B.public void m2() { }
• C.protected void m1() { }
• D.protected void m2() { }
• E.void m2() { }
• F.private void m1() { }
• G.public void m1() { }

DRAG DROP
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Correct Answer:

Given:
11.public void go(int x) {
12.assert (x > 0);
13.switch(x) {
14.case 2: ;
15.default: assert false;
16.}
17.}
18.private void go2(int x) { assert (x < 0); } Which statement is true?

• A.Only the assert statements on lines 12 and 18 are used appropriately.
• B.All of the assert statements are used appropriately.
• C.Only the assert statement on line 12 is used appropriately.
• D.Only the assert statement on line 15 is used appropriately.
• E.Only the assert statements on lines 12 and 15 are used appropriately.
• F.Only the assert statement on line 18 is used appropriately.
• G.Only the assert statements on lines 15 and 18 are used appropriately.

Given:
10.class Nav{
11.public enum Direction { NORTH, SOUTH, EAST, WEST }
12.}
13.public class Sprite{
14.// insert code here
15.}
Which code, inserted at line 14, allows the Sprite class to compile?

• A.Nav.Direction d = NORTH;
• B.Direction d = NORTH;
• C.Direction d = Direction.NORTH;
• D.Nav.Direction d = Nav.Direction.NORTH;