Which two methods from the java.util.stream.Streaminterface perform a reduction operation?
(Choose two.)

• A.count ()
• B.collect ()
• C.distinct ()
• D.peek ()
• E.filter ()

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Given:

Which option fails?

• A.Foo<String, String> pair = Foo.<String>twice ("Hello World!");
• B.Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
• C.Foo<Object, Object> percentage = new Foo<String, Integer>("Steve", 100);
• D.Foo<String, String> grade = new Foo <> ("John", "A");

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Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader("employee.txt"))) { // line n1 br.lines().forEach(c -> System.out.println(c)); brCopy = br;//line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an exception, and employee.txt is accessible and contains valid text.
What is the result?

• A.A compilation error occurs at line n3.
• B.A compilation error occurs at line n2.
• C.The code prints the content of the employee.txt file and throws an exception at line n3.
• D.A compilation error occurs at line n1.

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Given:

• A.A ClassCastException is thrown at runtime
• B.Compilation fails
• C.Ym Xm2
• D.Ym Xm1

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Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?

• A.This is not the only valid for loop construct; there exits another form of for loop constructor.
• B.The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
• C.When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
• D.The expression expr3 must be present. It is evaluated after each iteration through the loop.

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