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1z1-809 Exam Prep - 1z1-809 Study Guide - 1z1-809 Pass Test

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Oracle Java SE 8 Programmer II Sample Questions (Q90-Q95):

NEW QUESTION # 90
Given:

What change should you make to guarantee a single order of execution (printed values 1 -100 in order)?

A. Line 2: public synchronized int value;
B. Line 2: public volatile int value;
C. Line 1: class MyClass extends Thread {
D. Line 3: public synchronized void run() {

Answer: C

NEW QUESTION # 91
Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1to start r1and c1 threads?
Future<String> f1 = (Future<String>) es.submit (r1);

A. es.execute (c1);
es.execute (r1);
B. Future<String> f2 = (Future<String>) es.execute(c1);
es.submit(r1);
C. Future<String> f1 = es.submit (c1);
D. Future<String> f1 = es.execute (c1) ;
Future<String> f1 = (Future<String>) es.execute(r1);

Answer: C

NEW QUESTION # 92
Given the content:

and the code fragment:

What is the result?

A. username = Enter User Name
password = Enter Password
B. A compilation error occurs.
C. username = Entrez le nom d'utilisateur
password = Entrez le mot de passe
D. The program prints nothing.

Answer: C

NEW QUESTION # 93
Given the code fragment:
UnaryOperator<Integer> uo1 = s -> s*2; line n1
List<Double> loanValues = Arrays.asList(1000.0, 2000.0);
loanValues.stream()
. filter(lv -> lv >= 1500)
. map(lv -> uo1.apply(lv))
. forEach(s -> System.out.print(s + " "));
What is the result?

A. 0
B. 4000.0
C. A compilation error occurs at line n1.
D. A compilation error occurs at line n2.

Answer: A

NEW QUESTION # 94
Given the code fragments:
class MyThread implements Runnable {
private static AtomicInteger count = new AtomicInteger (0);
public void run () {
int x = count.incrementAndGet();
System.out.print (x+" ");
}
}
and
Thread thread1 = new Thread(new MyThread());
Thread thread2 = new Thread(new MyThread());
Thread thread3 = new Thread(new MyThread());
Thread [] ta = {thread1, thread2, thread3};
for (int x= 0; x < 3; x++) {
ta[x].start();
}
Which statement is true?

A. A compilation error occurs.
B. The program prints 1 1 1.
C. The program prints 1 2 3 and the order is unpredictable.
D. The program prints 1 2 3.

Answer: D

NEW QUESTION # 95
......

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Ray Fisher Ray Fisher

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