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Exam 1z0-809 topic 1 question 51 discussion

Actual exam question from Oracle's 1z0-809

Question #: 51
Topic #: 1

Given:
final class Folder { //line n1
//line n2
public void open () {
System.out.print("Open");
}
}
public class Test {
public static void main (String [] args) throws Exception { try (Folder f = new Folder()) { f.open();
}
}
}
Which two modifications enable the code to print Open Close? (Choose two.)

A. Replace line n1 with: class Folder implements AutoCloseable {
B. Replace line n1 with: class Folder extends Closeable {
C. Replace line n1 with: class Folder extends Exception {
D. At line n2, insert: final void close () { System.out.print("Close"); }
E. At line n2, insert: public void close () throws IOException { System.out.print("Close"); }

Show Suggested Answer

Suggested Answer: AE 🗳️

by Ajit0110 at Oct. 11, 2021, 9:06 a.m.

Comments

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6c84cb9

10 months, 4 weeks ago

import java.io.IOException; class Folder implements AutoCloseable { public void open() { System.out.print("Open"); } @Override public void close() throws IOException { System.out.print("Close"); } } public class Test { public static void main(String[] args) throws Exception { try (Folder f = new Folder()) { f.open(); } } }

upvoted 1 times

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6c84cb9

10 months, 4 weeks ago

A and E are correct.

upvoted 1 times

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shivkumarx

1 year, 3 months ago

AE is right AD would be right if the visibility was not reduced to package private

upvoted 1 times

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asdfjhfgjuaDCV

1 year, 3 months ago

AD is the correct answer final class Folder implements AutoCloseable { public void open() { System.out.print("Open"); } public final void close() { System.out.print("Close"); } } public class Test { public static void main(String[] args) throws Exception { try (Folder f = new Folder()) { f.open(); } } }

upvoted 1 times

shivkumarx

1 year, 3 months ago

Except D does not use public accessibility, and hence will not compile

upvoted 1 times

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steefaand

1 year, 4 months ago

Selected Answer: AE

A and E are correct.

upvoted 1 times

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duydn

1 year, 9 months ago

Selected Answer: AE

A & E are correct

upvoted 1 times

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r1muka5

2 years, 3 months ago

Answers are A and E.

upvoted 1 times

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WilsonKKerll

3 years, 3 months ago

Answer is A, E.

upvoted 3 times

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Ajit0110

3 years, 8 months ago

Option A and E are correct. Tested.Here we need to implement AutoCloseable interface while using try-with resources. When we implement Autocloaseable interface, we must all its methods i.e. open and close methods.

upvoted 4 times

mevlt

3 years, 4 months ago

Just close() there is no such method as open() in AutoCloseable

upvoted 1 times

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