Given:

and

Which interface from the java.util.functionpackage should you use to refactor the class Txt?

• A.Consumer
• B.Predicate
• C.Supplier
• D.Function

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Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream ("course.txt");
InputStreamReader isr = new InputStreamReader(fis);) {
while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?

• A.ur :: va
• B.A compilation error occurs at line n1.
• C.The program prints nothing.
• D.ueJa

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Assume customers.txtis accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txtfile?
Stream<String> stream = Files.find (Paths.get (“customers.txt”));

• A.stream.forEach( c) -> System.out.println(c));
  Stream<Path> stream = Files.list (Paths.get (“customers.txt”));
• B.stream.forEach((String c) -> System.out.println(c));
  Stream<Path> stream = Files.find (Paths.get (“customers.txt”));
• C.lines.forEach( c) -> System.out.println(c));
• D.stream.forEach( c) -> System.out.println(c));
  Stream<String> lines = Files.lines (Paths.get (“customers.txt”));

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Which two reasons should you use interfaces instead of abstract classes?

• A.You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
• B.You expect that unrelated classes would implement your interfaces.
• C.You want to share code among several closely related classes.
• D.You want to declare non-static on non-final fields.
• E.You want to take advantage of multiple inheritance of type.

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Which statement is true about the single abstract method of the java.util.function.Function interface?

• A.It accepts one argument and returns void.
• B.It accepts one argument and always produces a result of the same type as the argument.
• C.It accepts an argument and produces a result of any data type.
• D.It accepts one argument and returns boolean.

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