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

Given the code fragment:

List colors = Arrays.asList(“red”, “green”, “yellow”);

Predicate test = n - > {

System.out.println(“Searching…”);

return n.contains(“red”);

};

colors.stream()

.filter(c -> c.length() > 3)

.allMatch(test);

What is the result?

Given the code fragment:

class CallerThread implements Callable {

String str;

public CallerThread(String s) {this.str=s;}

public String call() throws Exception {

return str.concat(“Call”);

}

}

and

public static void main (String[] args) throws InterruptedException, ExecutionException

{

ExecutorService es = Executors.newFixedThreadPool(4); //line n1

Future f1 = es.submit (newCallerThread(“Call”));

String str = f1.get().toString();

System.out.println(str);

}

Which statement is true?

Given:

and the code fragment:

The threads t1 and t2 execute asynchronously and possibly prints ABCA or AACB.

You have been asked to modify the code to make the threads execute synchronously and prints ABC.

Which modification meets the requirement?

Given:

What is the result?