NO.1 Given the code fragment:
Path path1 =
Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 =
Paths.get("/server/exe/");
Path res1 =
path1.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/log/sys /server/exe/readme
D. /app/./sys/log
/readme
Answer: A
1z0-809자료
NO.2 Which three statements are
benefits of encapsulation?
A. Prevents code from causing exceptions
B.
Enables multiple instances of the same class to be created safely
C. Permits
classes to be combined into the same package
D. Protects confidential data
from leaking out of the objects
E. Enables the class implementation to
protect its invariants
F. Allows a class implementation to change without
changing t he clients
Answer: D,E,F
1z0-809 IT국제자격증
NO.3
Given:
Which two classes use the shape class correctly?
A. Option E
B.
Option F
C. Option A
D. Option C
E. Option B
F. Option D
Answer:
A,E
1z0-809자격증신청 1z0-809
IT국제자격증
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.4 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. An
AgeOutOfLimitException is thrown.
B. A UserException is thrown.
C. A
compilation error occurs in the main method.
D. User is
registered.
Answer: D
1z0-809자격증자료
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. An Execution is thrown at run time.
B. The program
prints:
Run Runner
Call Caller : null
And the program does not
terminate.
C. The program terminates after printing:
Run Runner
Call
Caller : Run
D. A compilation error occurs at line n1.
Answer: B
1z0-809자격증덤프
NO.6
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.
circle...
B. squarecircle...
C. Compilation fails.
D.
square...
Answer: B
1z0-809 dump
NO.7 Given the code
fragments:
class TechName {
String techName;
TechName (String techName)
{
this.techName=techName;
}
}
and
List<TechName> tech =
Arrays.asList (
new TechName("Java-"),
new TechName("Oracle DB-"),
new
TechName("J2EE-")
);
Stream<TechName> stre =
tech.stream();
//line n1
Which should be inserted at line n1 to print
Java-Oracle DB-J2EE-?
A. stre.forEachOrdered(System.out::print);
B.
stre.forEach(System.out::print);
C. stre.map(a->
a.techName).forEach(System.out::print);
D. stre.map(a->
a).forEachOrdered(System.out::print);
Answer:
D
1z0-809시험일정 1z0-809인증덤프
NO.8 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 does not terminate.
B. The
program prints Call Call and terminates.
C. A compilation error occurs at
line n1.
D. An ExecutionException is thrown at run time.
Answer:
A
1z0-809덤프
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