1Z0-819 Free Practice Test

Given:

Which is true?

1. A. The code compiles but does not print any result.
2. B. The code prints 25.
3. C. The code does not compile.
4. D. The code throws an exception at runtime.

Correct Answer: C

Given:

What is the result?

1. A. The compilation fails at line 9.
2. B. The compilation fails at line 2.
3. C. Hello World
4. D. The compilation fails at line 8.

Correct Answer: C

Given:

What is the result?

1. A. A ClassCastException is thrown at runtime.
2. B. AnotherClass#methodA()AnotherClass#methodA()
3. C. The compilation fails.
4. D. SomeClass#methodA()AnotherClass#methodA()
5. E. AnotherClass#methodA()SomeClass#methodA()
6. F. SomeClass#methodA()SomeClass#methodA()

Correct Answer: C

Given:

Which two independent changes will make the Main class compile? (Choose two.)

1. A. Move the entire Student class declaration to a separate Java file, Student.java.
2. B. Change line 2 to public Student(String classname).
3. C. Change line 1 to public class Student {.
4. D. Change line 3 to Student student = new Student(“Biology”);.
5. E. Change line 1 to static class Student {.

Correct Answer: BD

Given:

You want the code to produce this output:
John
Joe Jane
Which code fragment should be inserted on line 1 and line 2 to produce the output?

1. A. Insert Comparator<Person> on line 1.Insertpublic int compare(Person p1, Person p2) { return p1.name.compare(p2.name);}on line 2.
2. B. Insert Comparator on line 1.Insertpublic int compareTo(Person person) { return person.name.compareTo(this.name);}on line 2.
3. C. Insert Comparable on line 1.Insertpublic int compare(Person p1, Person p2) { return p1.name.compare(p2.name);}on line 2.
4. D. Insert Comparator on line 1.Insertpublic int compare(Person person) { return person.name.compare(this.name);}on line 2.

Correct Answer: B