Prepare Important Exam with 1z0-809 Exam Dumps(2026)
Pass Exam Questions Efficiently With 1z0-809 Questions
Oracle 1z0-809 exam is a certification exam for Java programmers who want to demonstrate their advanced knowledge and skills in Java programming. 1z0-809 exam is designed for those who have already passed the Oracle 1z0-808 exam and want to further their understanding of Java SE 8 programming concepts. Passing the 1z0-809 exam will provide certification as a Java SE 8 Programmer II.
NEW QUESTION # 44
Given:
and this code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. Open-Close-Open-Close-
- C. Open-Close-Exception - 1Open-Close-
- D. Open-Close-Open-
Answer: A
NEW QUESTION # 45
Given:
and this code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. Open-Close-Open-Close-
- C. Open-Close-Open-
- D. Open-Close-
Exception - 1
Open-Close-
Answer: A
NEW QUESTION # 46
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");)
public void run(Integer distance);
}
Which statement is true?
- A. Moveable can be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20); - B. Movable cannot be used in a lambda expression.
- C. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20); - D. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20);
Answer: A
NEW QUESTION # 47
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. A compilation error occurs in the main method.
- C. User is registered.
- D. An AgeOutOfLimitException is thrown.
Answer: D
NEW QUESTION # 48
Given:
class RateOfInterest {
public static void main (String[] args) {
int rateOfInterest = 0;
String accountType = "LOAN";
switch (accountType) {
case "RD";
rateOfInterest = 5;
break;
case "FD";
rateOfInterest = 10;
break;
default:
assert false: "No interest for this account"; //line n1
}
System.out.println ("Rate of interest:" + rateOfInterest);
}
}
and the command:
java -ea RateOfInterest
What is the result?
- A. Rate of interest: 0
- B. A compilation error occurs at line n1.
- C. An AssertionError is thrown.
- D. No interest for this account
Answer: C
NEW QUESTION # 49
Given the content of the employee.txt file:
Every worker is a master.
Given that the employee.txt file is accessible and the file allemp.txt does NOT exist, and the code fragment:
What is the result?
- A. allemp.txt is created and the content of employee.txt is copied to it.
- B. The program executes, does NOT affect the system, and produces NO output.
- C. Exception 1
- D. Exception 2
Answer: C
NEW QUESTION # 50
Given the code fragment:
Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
- A. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
- B. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
- C. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
- D. BiConsumer<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
Answer: A
Explanation:
References:
NEW QUESTION # 51
Given the code fragment:
Which code fragment, when inserted at line n1, ensures false is printed?
- A. boolean b = cs.stream() .findAny() .get() .equals("Java");
- B. boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
- C. boolean b = cs.stream() .findFirst() .get() .equals("Java");
- D. boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
Answer: D
NEW QUESTION # 52
Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream ("course.txt");
InputStreamReader isr = new InputStreamReader(fis);) {
while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?
ur :: va
- A. The program prints nothing.
- B.
- C. ueJa
- D. A compilation error occurs at line n1.
Answer: B
NEW QUESTION # 53
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. Replace line n1 with:
class Folder implements AutoCloseable { - B. Replace line n1 with:
class Folder extends Exception { - C. At line n2, insert:
public void close () throws IOException {
System.out.print("Close");
} - D. Replace line n1 with:
class Folder extends Closeable { - E. At line n2, insert:
final void close () {
System.out.print("Close");
}
Answer: A,C
Explanation:
Explanation/Reference:
NEW QUESTION # 54
Given the code fragments :
and
What is the result?
- A. TV Price :110 Refrigerator Price :2100
- B. The program prints nothing.
- C. A compilation error occurs.
- D. TV Price :1000 Refrigerator Price :2000
Answer: A
NEW QUESTION # 55
You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?
- A. Make the class static.
- B. Override equals() and hashCode() methods of the java.lang.Object class.
- C. Implement the Serializable interface.
- D. Use a static reference to point to the single instance.
- E. Make the constructor private.
Answer: D,E
NEW QUESTION # 56
Given:
Which option fails?
- A. Foo<Object, Object> percentage = new Foo<String, Integer>("Steve", 100);
- B. Foo<String, String> grade = new Foo <> ("John", "A");
- C. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
- D. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
Answer: D
NEW QUESTION # 57
Given:
and the code fragment:
What is the result?
- A. 0
- B. A compilation error occurs at line n1.
- C. 1
- D. An Exception is thrown at run time.
Answer: B
NEW QUESTION # 58
Given:
public class Canvas implements Drawable {
public void draw () { }
}
public abstract class Board extends Canvas { }
public class Paper extends Canvas {
protected void draw (int color) { }
}
public class Frame extends Canvas implements Drawable {
public void resize () { }
abstract void open ();
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?
- A. Paper does not compile.
- B. Board does not compile.
- C. All classes compile successfully.
- D. Drawable does not compile.
- E. Frame does not compile.
Answer: E
NEW QUESTION # 59
Given the code fragments:
and
What is the result?
- A. class java.io.IOException
- B. Video played.Game played.
- C. A compilation error occurs.
- D. class java.lang.Exception
Answer: D
NEW QUESTION # 60
Given the code fragments :
and
What is the result?
- A. TV Price :110 Refrigerator Price :2100
- B. The program prints nothing.
- C. A compilation error occurs.
- D. TV Price :1000 Refrigerator Price :2000
Answer: A
NEW QUESTION # 61
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 RunnerCall Caller : Run
- B. An Execution is thrown at run time.
- C. A compilation error occurs at line n1.
- D. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
Answer: D
NEW QUESTION # 62
Given:
What is the result?
- A. 1 3 5 7 9
- B. 2 4 6 8
- C. 1 3 5 7
- D. 2 4 6 8 9
Answer: B
NEW QUESTION # 63
Given the following code for the classes MyException and Test:
What is the result?
- A. B
- B. A
- C. AB
- D. A compile time error occurs at line n1.
- E. Either A or B
Answer: A
NEW QUESTION # 64
Given that course.txt is accessible and contains:
Course : : Java
and given the code fragment:
public static void main (String[ ] args) {
int i;
char c;
try (FileInputStream fis = new FileInputStream (“course.txt”);
InputStreamReader isr = new InputStreamReader(fis);) {
while (isr.ready()) { //line n1
isr.skip(2);
i = isr.read ();
c = (char) i;
System.out.print(c);
}
} catch (Exception e) {
e.printStackTrace();
}
}
What is the result?
ur :: va
- A. The program prints nothing.
- B.
- C. ueJa
- D. A compilation error occurs at line n1.
Answer: B
NEW QUESTION # 65
Which two are benefits of polymorphism?
- A. More efficient code at runtime
- B. Faster code at runtime
- C. More flexible and reusable code
- D. Code that is protected from extension by other classes
- E. More dynamic code at runtime
Answer: A,C
Explanation:
https://www.cs.princeton.edu/courses/archive/fall98/cs441/mainus/node5.html
NEW QUESTION # 66
Given the code fragment:
What is the result?
- A. Match 1
- B. No Match
- C. A nullPointerException is thrown at runtime.
- D. Match 2
Answer: D
NEW QUESTION # 67
......
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