Oracle Updated 1z0-809 Exam Questions and Answers by juliette

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 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?

Given the code fragment:

Path file = Paths.get (“courses.txt”);

// line n1

Assume the courses.txt is accessible.

Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?

Given the code fragment:

Stream> iStr= Stream.of (

Arrays.asList (“1”, “John”),

Arrays.asList (“2”, null)0;

Stream< nInSt = iStr.flatMapToInt ((x) -> x.stream ());

nInSt.forEach (System.out :: print);

What is the result?

Given:

class Worker extends Thread {

CyclicBarrier cb;

public Worker(CyclicBarrier cb) { this.cb = cb; }

public void run () {

try {

cb.await();

System.out.println(“Worker…”);

} catch (Exception ex) { }

}

}

class Master implements Runnable { //line n1

public void run () {

System.out.println(“Master…”);

}

}

and the code fragment:

Master master = new Master();

//line n2

Worker worker = new Worker(cb);

worker.start();

You have been asked to ensure that the run methods of both the Worker and Master classes are executed.

Which modification meets the requirement?