1Z0-809 Free Practice Test

Given the code fragment:

Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?

1. A. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + “,” + j+ “; “);};
2. B. BiFunction c = (i, j) –> {System.out.print (i + “,” + j+ “; “)};
3. C. BiConsumer c = (i, j) –> {System.out.print (i + “,” + j+ “; “)};
4. D. BiConsumer c = (i, j) –> {System.out.print (i + “,”+ j+ “; “);};

Correct Answer: B

Given the code fragment:
List nums = Arrays.asList (10, 20, 8): System.out.println (
//line n1
);
Which code fragment must be inserted at line n1 to enable the code to print the maximum number in the nums list?

1. A. nums.stream().max(Comparator.comparing(a -> a)).get()
2. B. nums.stream().max(Integer : : max).get()
3. C. nums.stream().max()
4. D. nums.stream().map(a -> a).max()

Correct Answer: A

Given the content of Operator.java, EngineOperator.java, and Engine.java files:

and the code fragment:

What is the result?

1. A. The Engine.java file fails to compile.
2. B. The EngineOperator.java file fails to compile.
3. C. The Operator.java file fails to compile.
4. D. ON OFF

Correct Answer: A

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?

1. A. ur :: va
2. B. ueJa
3. C. The program prints nothing.
4. D. A compilation error occurs at line n1.

Correct Answer: B

Given:

and

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

1. A. Consumer
2. B. Predicate
3. C. Supplier
4. D. Function

Correct Answer: C