Free Oracle 1z1-809 Exam Dumps Questions & Answers

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?

• A.  At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
• B.  Replace line n1 with class Master extends Thread {
• C.  At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);
• D.  At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);

Given the code fragment:
Stream<Path> files = Files.list(Paths.get(System.getProperty("user.home"))); files.forEach (fName -> {//line n1 try { Path aPath = fName.toAbsolutePath();//line n2 System.out.println(fName + ":"
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime ());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?

• A.  A compilation error occurs at line n2.
• B.  All files and directories under the home directory are listed along with their attributes.
• C.  The files in the home directory are listed along with their attributes.
• D.  A compilation error occurs at line n1.

Given the definition of the Emp class:
public class Emp
private String eName;
private Integer eAge;
Emp(String eN, Integer eA) {
this.eName = eN;
this.eAge = eA;
}
public Integer getEAge () {return eAge;}
public String getEName () {return eName;}
}
and code fragment:
List<Emp>li = Arrays.asList(new Emp("Sam", 20), New Emp("John", 60), New Emp("Jim", 51)); Predicate<Emp> agVal = s -> s.getEAge() <= 60;//line n1 li = li.stream().filter(agVal).collect(Collectors.toList()); Stream<String> names = li.stream()map.(Emp::getEName);//line n2 names.forEach(n -> System.out.print(n + " ")); What is the result?

• A.  Sam John Jim
• B.  A compilation error occurs at line n2.
• C.  A compilation error occurs at line n1.
• D.  John Jim

Given that version.txt is accessible and contains:
1234567890
and given the code fragment:

What is the result?

• A.  122
• B.  135
• C.  The program prints nothing.
• D.  121

Given the code fragment:

What is the result?

• A.  text1text2
• B.  text1text2text2text3
• C.  [text1, text2]
• D.  text1