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.)
To enable the code to print 'Open' and then 'Close', two modifications are necessary. First, the Folder class needs to implement the AutoCloseable interface so that it can be used in the try-with-resources statement. This is achieved by replacing line n1 with 'class Folder implements AutoCloseable'. Second, a close method needs to be defined in the class. Inserting a public void close() method that throws IOException and prints 'Close' at line n2 will fulfill this requirement. These changes ensure that the try-with-resources statement correctly handles the resources by calling the close method automatically.
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.
Just close() there is no such method as open() in AutoCloseable
Answer is A, E.
AE is right AD would be right if the visibility was not reduced to package private
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(); } } }
Except D does not use public accessibility, and hence will not compile
A and E are correct.
A & E are correct
Answers are A and E.