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Quiz 1z0-809 - Java SE 8 Programmer II–Professional Valid Exam Test

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Oracle 1z0-809 Exam Reference

Java 1z0-809 Free Test is a test created to demonstrate all the features of our Java8 Professional Web Simulator. You will be able to access 25 full questions and will have 44 minutes to finish the test.

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Read the question and select only the answer(s) you think are correct by checking the corresponding check box.

For more info visit: 1z0-809 Exam Reference">Oracle Java8 1z0-809 Exam Reference

Oracle Java SE 8 Programmer II Sample Questions (Q131-Q136):

NEW QUESTION # 131
You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?

A. Implement the Serializable interface.
B. Make the constructor private.
C. Use a static reference to point to the single instance.
D. Override equals() and hashCode() methods of the java.lang.Object class.
E. Make the class static.

Answer: B,C

NEW QUESTION # 132
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 terminates after printing:
Run Runner
Call Caller : Run
B. An Execution is thrown at run time.
C. The program prints:
Run Runner
Call Caller : null
And the program does not terminate.
D. A compilation error occurs at line n1.

Answer: C

NEW QUESTION # 133
Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path2.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?

A. /app/./sys/log/server/exe/readme
B. /app/sys/log/readme/server/exe
C. /app/./sys/log/readme
D. /app/log/sys/server/exe/readme

Answer: A

NEW QUESTION # 134
Given:
public class Test<T> {
private T t;
public T get () {
return t;
}
public void set (T t) {
this.t = t;
}
public static void main (String args [ ] ) {
Test<String> type = new Test<>();
Test type 1 = new Test (); //line n1
type.set("Java");
type1.set(100); //line n2
System.out.print(type.get() + " " + type1.get());
}
}
What is the result?
Java 100

A. java.lang.string@<hashcode>java.lang.Integer@<hashcode>
B.
C. A compilation error occurs. To rectify it, replace line n2with:
type1.set (Integer(100));
D. A compilation error occurs. To rectify it, replace line n1with:
Test<Integer> type1 = new Test<>();

Answer: A

NEW QUESTION # 135
Given:
class FuelNotAvailException extends Exception { }
class Vehicle {
void ride() throws FuelNotAvailException {//line n1
System.out.println("Happy Journey!");
}
}
class SolarVehicle extends Vehicle {
public void ride () throws FuelNotAvailException {//line n2
super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws Exception {
Vehicle v = new SolarVehicle ();
v.ride();
}
Which modification enables the code fragment to print Happy Journey!?

A. Replace line n1 with public void ride() throws FuelNotAvailException {
B. Replace line n1 with protected void ride() throws Exception {
C. Replace line n2 with private void ride() throws FuelNotAvailException {
D. Replace line n2 with void ride() throws Exception {

Answer: D

NEW QUESTION # 136
......

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