Updated Free Oracle 1z0-809 Test Engine Questions with 195 Q&As
The Best Java SE 1z0-809 Professional Exam Questions
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NEW QUESTION 59
Given the code fragment:
What is the result?
- A. 1 : 2 : 3 :
- B. An ArrayOutOfBoundsException is thrown at runtime.
- C. 1 : 2 : 3 : 4 : 5 :
- D. Compilation fails.
Answer: C
NEW QUESTION 60
Given the code fragment:
What is the result ?
- A. [X]
[X, X]
[X, X, X]
[X, X, X, X] - B. [X, X]
- C. [X]
[X, X]
[X, X, X] - D. [X, X]
[X, X, X, X]
Answer: A
NEW QUESTION 61
Given the code fragment:
What is the result?
- A. 1 3
1 3 - B. 1 3
followed by an ArrayIndexOutOfBoundsException - C. Compilation fails.
- D. 1 3
1 3 0 0 - E. 1 3 5 7
1 3
Answer: E
NEW QUESTION 62
Given the content of /resourses/Message.properties:
welcome1="Good day!"
and given the code fragment:
Properties prop = new Properties ();
FileInputStream fis = new FileInputStream ("/resources/Message.properties"); prop.load(fis); System.out.println(prop.getProperty("welcome1")); System.out.println(prop.getProperty("welcome2", "Test"));//line n1 System.out.println(prop.getProperty("welcome3")); What is the result?
- A. Good day!Testfollowed by an Exception stack trace
- B. A compilation error occurs at line n1.
- C. Good day!Testnull
- D. Good day!followed by an Exception stack trace
Answer: C
NEW QUESTION 63
The data.doc, data.txt and data.xml files are accessible and contain text.
Given the code fragment:
Stream<Path> paths = Stream.of (Paths. get("data.doc"),
Paths. get("data.txt"),
Paths. get("data.xml"));
paths.filter(s-> s.toString().endWith("txt")).forEach(
s -> {
try {
Files.readAllLines(s)
.stream()
.forEach(System.out::println); //line n1
} catch (IOException e) {
System.out.println("Exception");
}
}
);
What is the result?
- A. The program prints the content of data.txt file.
- B. The program prints:
Exception
<<The content of the data.txt file>>
Exception - C. A compilation error occurs at line n1.
- D. The program prints the content of the three files.
Answer: D
NEW QUESTION 64
Given the code fragment:
Which code fragment, when inserted at line n1, ensures falseis printed?
- A. boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
- B. boolean b = cs.stream() .findFirst() .get() .equals("Java");
- C. boolean b = cs.stream() .findAny() .get() .equals("Java");
- D. boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
Answer: D
NEW QUESTION 65
Given the code fragments:
class Caller implements Callable<String> {
String str;
public Caller (String s) {this.str=s;}
public String call()throws Exception { return str.concat ("Caller");}
}
class Runner implements Runnable {
String str;
public Runner (String s) {this.str=s;}
public void run () { System.out.println (str.concat ("Runner"));}
}
and
public static void main (String[] args) InterruptedException, ExecutionException {
ExecutorService es = Executors.newFixedThreadPool(2);
Future f1 = es.submit (new Caller ("Call"));
Future f2 = es.submit (new Runner ("Run"));
String str1 = (String) f1.get();
String str2 = (String) f2.get();//line n1
System.out.println(str1+ ":" + str2);
}
What is the result?
- A. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
- B. A compilation error occurs at line n1.
- C. The program terminates after printing:Run RunnerCall Caller : Run
- D. An Execution is thrown at run time.
Answer: A
NEW QUESTION 66
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?
- A. Arrays.sort(strArray, (CheckClass : : new).checkValue);
- B. Arrays.sort(strArray, CheckClass : : checkValue);
- C. Arrays.sort(strArray, CheckClass : : new : : checkValue);
- D. Arrays.sort(strArray, (CheckClass : : new) : : checkValue);
Answer: C
NEW QUESTION 67
Given the code fragment:
List<String> listVal = Arrays.asList("Joe", "Paul", "Alice", "Tom");
System.out.println (
// line n1
);
Which code fragment, when inserted at line n1, enables the code to print the count of string elements whose length is greater than three?
- A. listVal.stream().filter(x -> x.length()>3).count()
- B. listVal.stream().map(x -> x.length()>3).count()
- C. listVal.stream().peek(x -> x.length()>3).count().get()
- D. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count()
Answer: A
NEW QUESTION 68
Given the code fragment:
public class FileThread implements Runnable {
String fName;
public FileThread(String fName) { this.fName = fName; }
public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException, InterruptedException { ExecutorService executor = Executors.newCachedThreadPool(); Stream<Path> listOfFiles = Files.walk(Paths.get("Java Projects")); listOfFiles.forEach(line -> { executor.execute(new FileThread(line.getFileName().toString())); // line n1
});
executor.shutdown();
executor.awaitTermination(5, TimeUnit.DAYS);//
line n2
}
}
The Java Projects directory exists and contains a list of files.
What is the result?
- A. The program prints files names sequentially.
- B. The program prints files names concurrently.
- C. A compilation error occurs at line n1.
- D. The program throws a runtime exception at line n2.
Answer: B
NEW QUESTION 69
Given:
class RateOfInterest {
public static void main (String[] args) {
int rateOfInterest = 0;
String accountType = "LOAN";
switch (accountType) {
case "RD";
rateOfInterest = 5;
break;
case "FD";
rateOfInterest = 10;
break;
default: assert false: "No interest for this account"; //line n1 } System.out.println ("Rate of interest:" + rateOfInterest); } }
and the command:
java -ea RateOfInterest
What is the result?
- A. An AssertionError is thrown.
- B. Rate of interest: 0
- C. A compilation error occurs at line n1.
- D. No interest for this account
Answer: D
NEW QUESTION 70
Given the code fragment:
public class FileThread implements Runnable {
String fName;
public FileThread(String fName) { this.fName = fName; }
public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException,
InterruptedException {
ExecutorService executor = Executors.newCachedThreadPool();
Stream<Path> listOfFiles = Files.walk(Paths.get("Java Projects"));
listOfFiles.forEach(line -> {
executor.execute(new FileThread(line.getFileName().toString
())); //
line n1
});
executor.shutdown();
executor.awaitTermination(5, TimeUnit.DAYS); //
line n2
}
}
The Java Projects directory exists and contains a list of files.
What is the result?
- A. The program prints files names sequentially.
- B. The program prints files names concurrently.
- C. A compilation error occurs at line n1.
- D. The program throws a runtime exception at line n2.
Answer: B
NEW QUESTION 71
Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path1.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?
- A. /app/log/sys/server/exe/readme
- B. /app/sys/log/readme/server/exe
- C. /app/./sys/log/server/exe/readme
- D. /app/./sys/log/readme
Answer: D
NEW QUESTION 72
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");) public void run(Integer distance);
}
Which statement is true?
- A. Movable cannot be used in a lambda expression.
- B. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20); - C. Moveable can be used as below:
Moveable<Integer> animal = n - >n + 10;
animal.run(100);
animal.walk(20); - D. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20);
Answer: C
NEW QUESTION 73
Given the code fragment:
List<String> listVal = Arrays.asList("Joe", "Paul", "Alice", "Tom");
System.out.println (
// line n1
);
Which code fragment, when inserted at line n1, enables the code to print the count of string elements whose length is greater than three?
- A. listVal.stream().map(x -> x.length()>3).count()
- B. listVal.stream().peek(x -> x.length()>3).count().get()
- C. listVal.stream().filter(x -> x.length()>3).count()
- D. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count()
Answer: B
NEW QUESTION 74
......
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