Java Standard Edition 5 Programmer Certified Professional Exam (1Z0-853) Free Practice Test

Question 1

DRAG DROP
Click the Task button.

Correct Answer:

Question 2

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

A. ClassC is displayed.

B. An exception is thrown at runtime.

C. Compilation fails.

D. The code runs with no output.

Correct Answer: B

Question 3

DRAG DROP
Click the Task button.

Correct Answer:

Question 4

When comparing java.io.BufferedWriter to java.io.FileWriter, which capability exists as a method in only one of the two?

A. marking a location in the stream

B. flushing the stream

C. closing the stream

D. writing to the stream

E. writing a line separator to the stream

Correct Answer: E

Question 5

Given:
10.
public class Foo {
11.
static int[] a;
12.
static { a[0]=2; }
13.
public static void main( String[] args ) {}
14.
}
Which exception or error will be thrown when a programmer attempts to run this code?

A. java.lang.StackOverflowError

B. java.lang.ArrayIndexOutOfBoundsException

C. java.lang.IllegalStateException

D. java.lang.ExceptionInInitializerError

Correct Answer: D

Question 6

Given:
1.class ClassA {
2.public int numberOfInstances;
3.protected ClassA(int numberOfInstances) {
4.this.numberOfInstances = numberOfInstances;
5.}
6.}
7.public class ExtendedA extends ClassA {
8.private ExtendedA(int numberOfInstances) {
9.super(numberOfInstances);
10.
}
11.
public static void main(String[] args) {
12.
ExtendedA ext = new ExtendedA(420);
13.
System.out.print(ext.numberOfInstances);
14.
}
15.
}
Which statement is true?

A. All constructors must be declared public.

B. 420 is the output.

C. An exception is thrown at runtime.

D. Constructors CANNOT use the private modifier.

E. Constructors CANNOT use the protected modifier.

Correct Answer: B

Question 7

Given:
11.
static void test() throws Error {
12.
if (true) throw new AssertionError();
13.
System.out.print("test ");
14.
}
15.
public static void main(String[] args) {
16.
try { test(); }
17.
catch (Exception ex) { System.out.print("exception "); }
18.
System.out.print("end ");
19.
}
What is the result?

A. An Exception is thrown by main.

B. exception end

C. Compilation fails.

D. A Throwable is thrown by main.

E. end

F. exception test end

Correct Answer: D

Question 8

Given:
23.
int z = 5;
24.
25.
public void stuff1(int x) {
26.
assert (x > 0);
27.
switch(x) {
28.
case 2: x = 3;
29.
default: assert false; } }
30.
31.
private void stuff2(int y) { assert (y < 0); }
32.
33.
private void stuff3() { assert (stuff4()); }
34.
35.
private boolean stuff4() { z = 6; return false; }
Which statement is true?

A. The assert statements on lines 29 and 31 are used appropriately.

B. The assert statements on lines 26, 29, and 31 are used appropriately.

C. The assert statements on lines 29, 31, and 33 are used appropriately.

D. The assert statements on lines 26 and 29 are used appropriately.

E. The assert statements on lines 29 and 33 are used appropriately.

F. All of the assert statements are used appropriately.

G. Only the assert statement on line 31 is used appropriately.

Correct Answer: A

Question 9

DRAG DROP
Click the Task button.

Correct Answer:

Question 10

Given:
1.class TestA {
2.public void start() { System.out.println("TestA"); }
3.}
4.public class TestB extends TestA {
5.public void start() { System.out.println("TestB"); }
6.public static void main(String[] args) {
7.((TestA)new TestB()).start();
8.}
9.}
What is the result?

A. An exception is thrown at runtime.

B. TestB

C. Compilation fails.

D. TestA

Correct Answer: B

Question 11

DRAG DROP
Click the Task button.

Correct Answer:

Question 12

Given:
12.
public class Wow {
13.
public static void go(short n) {System.out.println("short");}
14.
public static void go(Short n) {System.out.println("SHORT");}
15.
public static void go(Long n) {System.out.println(" LONG");}
16.
public static void main(String [] args) {
17.
Short y = 6;
18.
int z = 7;
19.
go(y);
20.
go(z);
21.
}
22.
}
What is the result?

A. SHORT LONG

B. short LONG

C. An exception is thrown at runtime.

D. Compilation fails.

Correct Answer: D

Question 13

Given:
11.
public class Person {
12.
private String name;
13.
public Person(String name) {
14.
this.name = name;
15.
}
16.
public boolean equals(Object o) {
17.
if ( ! o instanceof Person ) return false;
18.
Person p = (Person) o;
19.
return p.name.equals(this.name);
20.
}
21.
}
Which statement is true?

A. All Person objects will have the same hash code because the hashCode method is not overridden.

B. A HashSet could contain multiple Person objects with the same name.

C. Compilation fails because the hashCode method is not overridden.

D. If a HashSet contains more than one Person object with name="Fred", then removing another Person, also with name="Fred", will remove them all.

Correct Answer: B

Question 14

DRAG DROP
Click the Task button.

Correct Answer:

Welcome to TestSimulate

Oracle Java Standard Edition 5 Programmer Certified Professional (1Z0-853) Free Practice Test