Top Quality 1Z0-809 Exam Questions and Answers 2021

NEW QUESTION 1
Given the code fragment:
List<String> empDetails = Arrays.asList(“100, Robin, HR”, “200, Mary, AdminServices”,
“101, Peter, HR”);
empDetails.stream()
.filter(s-> s.contains(“1”))
.sorted()
.f orEach(System.out::println); //line n1
What is the result?

• A. 100, Robin, HR101, Peter, HR
• B. A compilation error occurs at line n1.
• C. 100, Robin, HR101, Peter, HR200, Mary, AdminServices
• D. 100, Robin, HR200, Mary, AdminServices101, Peter, HR

Answer: A

NEW QUESTION 2
Given the code fragments:

and

Which two modifications enable to sort the elements of the emps list? (Choose two.)

• A. Replace line n1 withclass Person extends Comparator<Person>
• B. At line n2 insertpublic int compareTo (Person p) { return this.name.compareTo (p.name);}
• C. Replace line n1 withclass Person implements Comparable<Person>
• D. At line n2 insertpublic int compare (Person p1, Person p2) { return p1.name.compareTo (p2.name);}
• E. At line n2 insert:public int compareTo (Person p, Person p2) { return p1.name.compareTo (p2.name);}
• F. Replace line n1 withclass Person implements Comparator<Person>

Answer: CE

NEW QUESTION 3
Given the code fragments:

and

What is the result?

• A. FranceOptional[NotFound]
• B. Optional [France] Optional [NotFound]
• C. Optional[France] Not Found
• D. FranceNot Found

Answer: D

NEW QUESTION 4
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)
.f ilter(cf2 //line n2
.count(); System.out.println(c); What is the result?

• A. 2
• B. 3
• C. A compilation error occurs at line n1.
• D. A compilation error occurs at line n2.

Answer: B

NEW QUESTION 5
Which code fragment is required to load a JDBC 3.0 driver?

• A. Connection con = Connection.getDriver (“jdbc:xyzdata://localhost:3306/EmployeeDB”);
• B. Class.forName(“org.xyzdata.jdbc.NetworkDriver”);
• C. Connection con = DriverManager.getConnection (“jdbc:xyzdata://localhost:3306/EmployeeDB”);
• D. DriverManager.loadDriver (“org.xyzdata.jdbc.NetworkDriver”);

Answer: B

NEW QUESTION 6
Given the code fragment:

What is the result?

• A. text1text2
• B. text1text2text2text3
• C. text1
• D. [text1, text2]

Answer: A

NEW QUESTION 7
Given the code fragment: public class Foo {
public static void main (String [ ] args) {
Map<Integer, String> unsortMap = new HashMap< > ( ); unsortMap.put (10, “z”);
unsortMap.put (5, “b”);
unsortMap.put (1, “d”);
unsortMap.put (7, “e”);
unsortMap.put (50, “j”);
Map<Integer, String> treeMap = new TreeMap <Integer, String> (new Comparator<Integer> ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) { System.out.print (entry.getValue () + “ “);
}
}
}
What is the result?

• A. A compilation error occurs.
• B. d b e z j
• C. j z e b d
• D. z b d e j

Answer: C

NEW QUESTION 8
Given the code fragment:
public static void main (String [ ] args) throws IOException {
BufferedReader br = new BufferedReader (new InputStremReader (System.in)); System.out.print (“Enter GDP: “);
//line 1
}
Which code fragment, when inserted at line 1, enables the code to read the GDP from the user?

• A. int GDP = Integer.parseInt (br.readline());
• B. int GDP = br.read();
• C. int GDP = br.nextInt();
• D. int GDP = Integer.parseInt (br.next());

Answer: A

NEW QUESTION 9
Given:

What is the result?

• A. IT:null
• B. A NullPointerException is thrown at run time.
• C. A compilation error occurs.
• D. IT:0.0

Answer: D

NEW QUESTION 10
Given:
public class product { int id; int price;
public Product (int id, int price) { this.id = id;
this.price = price;
}
public String toString() { return id + “:” + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10), new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> { p1.price+=p2.price;
return new Product (p1.id, p1.price);}); products.add(p); products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.i fPresent(System.out: :println); What is the result?

• A. 2 : 30
• B. 4 : 0
• C. 4 : 60
• D. 4 : 602 : 303 : 201 : 10
• E. The program prints nothing.

Answer: C

NEW QUESTION 11
Given the code fragment:
Path p1 = Paths.get(“/Pics/MyPic.jpeg”); System.out.println (p1.getNameCount() + “:” + p1.getName(1) +
“:” + p1.getFileName());
Assume that the Pics directory does NOT exist.
What is the result?

• A. An exception is thrown at run time.
• B. 2:MyPic.jpeg: MyPic.jpeg
• C. 1:Pics:/Pics/ MyPic.jpeg
• D. 2:Pics: MyPic.jpeg

Answer: B

NEW QUESTION 12
Given:

and the code fragment:

What is the result?

• A. 0.0
• B. 1500.0
• C. A compilation error occur
• D. 2000.0

Answer: D

NEW QUESTION 13
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?

• A. ur :: va
• B. ueJa
• C. The program prints nothing.
• D. A compilation error occurs at line n1.

Answer: B

NEW QUESTION 14
Given the code fragment:
List<Integer> nums = Arrays.asList (10, 20, 8): System.out.println (
//line n1
);
Which code fragment must be inserted at line n1 to enable the code to print the maximum number in the nums list?

• A. nums.stream().max(Comparator.comparing(a -> a)).get()
• B. nums.stream().max(Integer : : max).get()
• C. nums.stream().max()
• D. nums.stream().map(a -> a).max()

Answer: A

NEW QUESTION 15
Given the code fragment:
public void recDelete (String dirName) throws IOException { File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) { if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (“.class”)) aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked.
What is the result?

• A. The method deletes all the .class files in the Projects directory and its subdirectories.
• B. The method deletes the .class files of the Projects directory only.
• C. The method executes and does not make any changes to the Projects directory.
• D. The method throws an IOException.

Answer: A

NEW QUESTION 16
Given the content of /resourses/Message.properties: welcome1=”Good day!”
and given the code fragment: Properties prop = new Properties ();
FileInputStream fis = new FileInputStream (“/resources/Message.properties”); prop.load(fis);
System.out.println(prop.getProperty(“welcome1”)); System.out.println(prop.getProperty(“welcome2”, “Test”));//line n1 System.out.println(prop.getProperty(“welcome3”));
What is the result?

• A. Good day!Testfollowed by an Exception stack trace
• B. Good day!followed by an Exception stack trace
• C. Good day!Test null
• D. A compilation error occurs at line n1.

Answer: C