NO.1 Given the code fragment:
class CallerThread implements
Callable<String> {
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?
A. The program prints Call Call and terminates.
B. The program
prints Call Call and does not terminate.
C. A compilation error occurs at
line n1.
D. An ExecutionException is thrown at run time.
Answer:
B
Oracle자격증자료 1z0-809국제공인자격증 1z0-809 1z0-809 IT자격증
NO.2
Given:
Class A { }
Class B { }
Interface X { }
Interface Y {
}
Which two definitions of class C are valid?
A. Class C extends A
implements X { }
B. Class C implements Y extends B { }
C. Class C extends
A, B { }
D. Class C implements X, Y extends B { }
E. Class C extends B
implements X, Y { }
Answer:
A,E
Oracle덤프자료 1z0-809교육 1z0-809자료
Explanation:
extends is for
extending a class.
implements is for implementing an interface. Java allows
for a class to implement many interfaces.
NO.3 Given the code
fragment:
int b = 3;
if ( !(b > 3)) {
System.out.println("square
");
}{
System.out.println("circle
");
}
System.out.println("...");
What is the result?
A.
square...
B. circle...
C. squarecircle...
D. Compilation
fails.
Answer: C
Oracle최신버전덤프 1z0-809시험문제 1z0-809 dump
NO.4
Given:
Which two classes use the shape class correctly?
A. Option A
B.
Option B
C. Option C
D. Option D
E. Option E
F. Option F
Answer:
B,E
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Explanation:
When an abstract class is subclassed, the
subclass usually provides implementations for all of the
abstract methods in
its parent class (E). However, if it does not, then the subclass must also
be
declared abstract (B). Note: An abstract class is a class that is declared
abstract-it may or may not
include abstract methods. Abstract classes cannot
be instantiated, but they can be subclassed.
NO.5 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 prints:
Run Runner
Call Caller : null
And the
program does not terminate.
B. The program terminates after printing:
Run
Runner
Call Caller : Run
C. A compilation error occurs at line n1.
D.
An Execution is thrown at run time.
Answer:
A
Oracle교육 1z0-809시험정보 1z0-809 Dump 1z0-809 1z0-809
NO.6
Which three statements are benefits of encapsulation?
A. Allows a class
implementation to change without changing t he clients
B. Protects
confidential data from leaking out of the objects
C. Prevents code from
causing exceptions
D. Enables the class implementation to protect its
invariants
E. Permits classes to be combined into the same package
F.
Enables multiple instances of the same class to be created safely
Answer:
A,B,D
Oracle자격증신청 1z0-809교육 1z0-809
NO.7 Given:
class
UserException extends Exception { }
class AgeOutOfLimitException extends
UserException { }
and the code fragment:
class App {
public void
doRegister(String name, int age)
throws UserException, AgeOutOfLimitException
{
if (name.length () < 6) {
throw new UserException ();
} else if
(age >= 60) {
throw new AgeOutOfLimitException ();
} else
{
System.out.println("User is registered.");
}
}
public static void
main(String[ ] args) throws UserException {
App t = new App
();
t.doRegister("Mathew", 60);
}
}
What is the result?
A. User
is registered.
B. An AgeOutOfLimitException is thrown.
C. A UserException
is thrown.
D. A compilation error occurs in the main method.
Answer:
A
Oracle자격증시험 1z0-809시험후기 1z0-809 1z0-809 PDF
NO.8
Given:
class ImageScanner implements AutoCloseable {
public void close ()
throws Exception {
System.out.print ("Scanner closed.");
}
public void
scanImage () throws Exception {
System.out.print ("Scan.");
throw new
Exception("Unable to scan.");
}
}
class ImagePrinter implements
AutoCloseable {
public void close () throws Exception {
System.out.print
("Printer closed.");
}
public void printImage ()
{System.out.print("Print."); }
}
and this code fragment:
try
(ImageScanner ir = new ImageScanner();
ImagePrinter iw = new ImagePrinter())
{
ir.scanImage();
iw.printImage();
} catch (Exception e)
{
System.out.print(e.getMessage());
}
What is the result?
A.
Scan.Printer closed. Scanner closed. Unable to scan.
B. Scan.Scanner closed.
Unable to scan.
C. Scan. Unable to scan.
D. Scan. Unable to scan. Printer
closed.
Answer: B
Oracle
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