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Oracle 1z1-809 exam covers a wide range of topics related to Java programming, including Java Class Design, Advanced Java Class Design, Generics and Collections, Lambda Built-in Functional Interfaces, Java Stream API, Exceptions and Assertions, Java I/O Fundamentals, Java Concurrency, Building Database Applications with JDBC, and Localization.
Oracle 1z0-809 exam covers a wide range of topics in Java programming language. It tests the candidate's expertise in Java SE 8, including advanced concepts such as concurrency, I/O, and NIO. 1z0-809 exam also covers design patterns, functional programming, lambda expressions, and other advanced topics. 1z0-809 exam is designed to evaluate a candidate's ability to write code that is efficient, scalable, and maintainable.
NEW QUESTION # 88
Given the code fragment:
What is the result?
- A. Val: Val: Val:
- B. A compilation error occurs.
- C. Val:10 Val:20 Val:30
- D. Val:20 Val:40 Val:60
Answer: C
NEW QUESTION # 89
Given:
public class Customer {
private String fName;
private String lName;
private static int count;
public customer (String first, String last) {fName = first, lName = last;
++count;}
static { count = 0; }
public static int getCount() {return count; }
}
public class App {
public static void main (String [] args) {
Customer c1 = new Customer("Larry", "Smith");
Customer c2 = new Customer("Pedro", "Gonzales");
Customer c3 = new Customer("Penny", "Jones");
Customer c4 = new Customer("Lars", "Svenson");
c4 = null;
c3 = c2;
System.out.println (Customer.getCount());
}
}
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: A
NEW QUESTION # 90
Given:
and the code fragment:
What is the result?
- A. [Java EE: Helen:Houston]
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] - B. A compilation error occurs.
- C. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
[Java EE: Helen:Houston] - D. Java EE
Java ME
Answer: B
NEW QUESTION # 91
In 2015, daylight saving time in New York, USA, begins on March 8th at 2:00 AM. As a result, 2:00 AM becomes 3:00 AM.
Given the code fragment:
Which is the result?
- A. 2:00 - difference: 1
- B. 4:00 - difference: 3
- C. 4:00 - difference: 2
- D. 3:00 - difference: 2
Answer: A
NEW QUESTION # 92
Given the code fragment:
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists
The Employee table has a column ID of type integer and the SQL query matches one record.
What is the result?
- A. The code prints Error.
- B. Compilation fails at line 15.
- C. The code prints the employee ID.
- D. Compilation fails at line 14.
Answer: D
NEW QUESTION # 93
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) throws 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. A compilation error occurs at line n1.
- B. The program terminates after printing:Run RunnerCall Caller : Run
- C. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
- D. An Execution is thrown at run time.
Answer: D
NEW QUESTION # 94
Which two reasons should you use interfaces instead of abstract classes? (Choose two.)
- A. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
- B. You want to declare non-static on non-final fields.
- C. You want to take advantage of multiple inheritance of type.
- D. You want to share code among several closely related classes.
- E. You expect that unrelated classes would implement your interfaces.
Answer: C,E
NEW QUESTION # 95
Given:
From what threading problem does the program suffer?
- A. livelock
- B. starvation
- C. deadlock
- D. race condition
Answer: C
NEW QUESTION # 96
Given the code fragment:
What is the result?
- A. A B D C
- B. A B D
- C. A B C C
- D. A C D
- E. A B C D
Answer: C
NEW QUESTION # 97
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. The program compiles successfully.
- D. A compilation error occurs because the tryblock doesn't have a catchor finallyblock.
Answer: D
NEW QUESTION # 98
Given the code fragment:
Which two code fragments, when inserted at line n1 independently, result in the output PEEK: Unix?
- A. .allMatch ();
- B. .anyMatch ();
- C. .findAny ();
- D. .noneMatch ();
- E. .findFirst ();
Answer: C,E
NEW QUESTION # 99
Given:
And given the code fragment:
What is the result?
- A. C2C2
- B. C1C1
- C. Compilation fails.
- D. C1C2
Answer: C
NEW QUESTION # 100
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. 0
- C. An Exception is thrown at run time.
- D. 1
Answer: B
NEW QUESTION # 101
Given:
What is the result?
- A. 10 : 22 : 6
- B. 10 : 30 : 6
- C. 10 : 22 : 20
- D. 10 : 22 : 22
Answer: A
NEW QUESTION # 102
Given the code fragments:
and
What is the result?
France
- A. Optional [NotFound]
Optional[France] - B. Not Found
- C. Optional[NotFound]
Optional [France] - D. Not Found
France
Answer: B
NEW QUESTION # 103
Given the code fragment:
What is the result?
- A. 1 3
followed by an ArrayIndexOutOfBoundsException - B. 1 3 5 7
1 3 - C. 1 3
1 3 - D. 1 3
1 3 0 0 - E. Compilation fails.
Answer: B
NEW QUESTION # 104
Given:
final class Folder {//line n1
//line n2
public void open () {
System.out.print("Open");
}
}
public class Test {
public static void main (String [] args) throws Exception {
try (Folder f = new Folder()) {
f.open();
}
}
}
Which two modifications enable the code to print Open Close? (Choose two.)
- A. At line n2, insert:public void close () throws IOException {System.out.print("Close");}
- B. Replace line n1 with:class Folder extends Exception {
- C. At line n2, insert:final void close () {System.out.print("Close");}
- D. Replace line n1 with:class Folder implements AutoCloseable {
- E. Replace line n1 with:class Folder extends Closeable {
Answer: A,D
NEW QUESTION # 105
Given:
public class Customer {
private String fName;
private String lName;
private static int count;
public customer (String first, String last) {fName = first, lName = last;
+ +count;}
static { count = 0; }
public static int getCount() {return count; }
}
public class App {
public static void main (String [] args) {
Customer c1 = new Customer("Larry", "Smith");
Customer c2 = new Customer("Pedro", "Gonzales");
Customer c3 = new Customer("Penny", "Jones");
Customer c4 = new Customer("Lars", "Svenson");
c4 = null;
c3 = c2;
System.out.println (Customer.getCount());
}
}
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: A
NEW QUESTION # 106
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. A UserException is thrown.
- B. User is registered.
- C. An AgeOutOfLimitException is thrown.
- D. A compilation error occurs in the main method.
Answer: B
NEW QUESTION # 107
Given the code fragments:
4.void doStuff() throws ArithmeticException, NumberFormatException, Exception {
5.if (Math.random() >-1 throw new Exception ("Try again");
6.} and
24.
try {
25.
doStuff ( ):
26.
} catch (ArithmeticException | NumberFormatException | Exception e) {
27.
System.out.println (e.getMessage()); }
28.
catch (Exception e) {
29.
System.out.println (e.getMessage()); }
30.
}
Which modification enables the code to print Try again?
- A. Replace line 26 with:
} catch (ArithmeticException | NumberFormatException e) { - B. Replace line 27 with:
throw e; - C. Comment the lines 28, 29 and 30.
- D. Replace line 26 with:
} catch (Exception | ArithmeticException | NumberFormatException e) {
Answer: A
NEW QUESTION # 108
Given:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. Compilation fails.
Answer: D
NEW QUESTION # 109
Given the code fragment:
Which code fragment, when inserted at line 3, enables the code to print 10:20?
- A. int array [2] ;
- B. int array = new int [2] ;
- C. int [ ] array = new int [2] ;
- D. int [ ] array;
Answer: C
NEW QUESTION # 110
Given:
and this code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. Open-Close-Open-
- C. Open-Close-
Exception - 1
Open-Close- - D. Open-Close-Open-Close-
Answer: A
NEW QUESTION # 111
Given the code fragments:
interface CourseFilter extends Predicate<String> {
public default boolean test (String str) {
return str.equals ("Java");
}
}
and
List<String> strs = Arrays.asList("Java", "Java EE", "Java ME");
Predicate<String> cf1 = s - > s.length() > 3;
Predicate cf2 = new CourseFilter() { //line n1
public boolean test (String s) {
return s.contains ("Java");
}
};
long c = strs.stream()
.filter(cf1)
.filter(cf2 //line n2
.count();
System.out.println(c);
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. 0
- D. 1
Answer: C
NEW QUESTION # 112
......
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