1Z0-809 Free Practice Test

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

1. A. f.open();}}}Which two modifications enable the code to print Open Close? (Choose two.)
2. B. Replace line n1 with:class Folder implements AutoCloseable {
3. C. Replace line n1 with:class Folder extends Closeable {
4. D. Replace line n1 with:class Folder extends Exception {
5. E. At line n2, insert: final void close () {System.out.print(“Close”);}
6. F. At line n2, insert:public void close () throws IOException { System.out.print(“Close”);}

Correct Answer: AE

Given:
class CheckClass {
public static int checkValue (String s1, String s2) { return s1 length() – s2.length();
}
}
and the code fragment:
String[] strArray = new String [] {“Tiger”, “Rat”, “Cat”, “Lion”}
//line n1
for (String s : strArray) { System.out.print (s + “ “);
}
Which code fragment should be inserted at line n1 to enable the code to print Rat Cat Lion Tiger?

1. A. Arrays.sort(strArray, CheckClass : : checkValue);
2. B. Arrays.sort(strArray, (CheckClass : : new) : : checkValue);
3. C. Arrays.sort(strArray, (CheckClass : : new).checkValue);
4. D. Arrays.sort(strArray, CheckClass : : new : : checkValue);

Correct Answer: A

Given:
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1. A. An AssertionError is thrown.
2. B. A compilation error occurs at line n1.
3. C. New Price: 0.0
4. D. A NumberFormatException is thrown at run time.

Correct Answer: D

Given the code fragment:
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1. A. boolean b = cs.stream() .findAny() .get() .equals(“Java”);
2. B. boolean b = cs.stream() .anyMatch (w -> w.equals (“Java”));
3. C. boolean b = cs.stream() .findFirst() .get() .equals(“Java”);
4. D. boolean b = cs.stream() .allMatch(w -> w.equals(“Java”));

Correct Answer: C