[Dec 21, 2021] Powerful 1z0-809 PDF Dumps for 1z0-809 Questions
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NEW QUESTION 34
Given:
What is the result?
- A. Hi MyClass
- B. A compilation error occurs.
- C. Hi Interface-1
- D. Hi Interface-2
Answer: A
NEW QUESTION 35
Given the code fragment:
Which two code fragments can be independently inserted at line n1 to enable the code to print the elements of the array in reverse order?
- A. Option A
- B. Option B
- C. Option D
- D. Option C
- E. Option E
Answer: A,E
NEW QUESTION 36
Given the code fragment:
Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
- A. BiConsumer<Integer, Integer, Integer> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ");};
- B. BiConsumer<Integer,Integer> c = (i, j) ->
{System.out.print (i + "," + j+
"; ");}; - C. BiConsumer<Integer, Integer, String> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};
- D. BiFunction<Integer, Integer, String> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};
Answer: B
NEW QUESTION 37
Which class definition compiles?
- A. Option B
- B. Option D
- C. Option C
- D. Option A
Answer: A
NEW QUESTION 38
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?
- A. Replace line n1 with:
class Folder extends Exception { - B. Replace line n1 with:
class Folder implements AutoCloseable { - C. Replace line n1 with:
class Folder extends Closeable { - D. At line n2, insert:
final void close () {
System.out.print("Close");
} - E. At line n2, insert:
public void close () throws IOException {
System.out.print("Close");
}
Answer: A,B
NEW QUESTION 39
Given:
class FuelNotAvailException extends Exception { }
class Vehicle {
void ride() throws FuelNotAvailException {//line n1
System.out.println("Happy Journey!");
}
}
class SolarVehicle extends Vehicle {
public void ride () throws Exception {//line n2
super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws FuelNotAvailException, Exception {
Vehicle v = new SolarVehicle ();
v.ride();
}
Which modification enables the code fragment to print Happy Journey!?
- A. Replace line n2 with void ride() throws Exception {
- B. Replace line n1 with protected void ride() throws Exception {
- C. Replace line n1 with public void ride() throws FuelNotAvailException {
- D. Replace line n2 with private void ride() throws FuelNotAvailException {
Answer: B
NEW QUESTION 40
Given:
From what threading problem does the program suffer?
- A. starvation
- B. livelock
- C. race condition
- D. deadlock
Answer: D
NEW QUESTION 41
Given the code fragment:
List<String> listVal = Arrays.asList("Joe", "Paul", "Alice", "Tom");
System.out.println (
// line n1
);
Which code fragment, when inserted at line n1, enables the code to print the count of string elements whose length is greater than three?
- A. listVal.stream().map(x -> x.length()>3).count()
- B. listVal.stream().peek(x -> x.length()>3).count().get()
- C. listVal.stream().filter(x -> x.length()>3).count()
- D. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count()
Answer: B
NEW QUESTION 42
Given:
Item table
* ID, INTEGER: PK
* DESCRIP, VARCHAR(100)
* PRICE, REAL
* QUANTITY< INTEGER
And given the code fragment:
9. try {
10.Connection conn = DriveManager.getConnection(dbURL, username, password);
11. String query = "Select * FROM Item WHERE ID = 110";
12. Statement stmt = conn.createStatement();
13. ResultSet rs = stmt.executeQuery(query);
14.while(rs.next()) {
15.System.out.println("ID:" + rs.getString(1));
16.System.out.println("Description:" + rs.getString(2));
17.System.out.println("Price:" + rs.getString(3));
18. System.out.println(Quantity:" + rs.getString(4));
19.}
20. } catch (SQLException se) {
21. System.out.println("Error");
22. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The SQL query is valid.
What is the result?
- A. The code prints information about Item 110.
- B. Compilation fails.
- C. An exception is thrown at runtime.
- D. The code prints Error.
Answer: B
NEW QUESTION 43
Given:
What is the result?
- A. 100 0 : 100 0 ;
- B. 100 200 : 100 200 ;
- C. 100 200 : 100 0 ;
- D. 100 0 : 100 200 ;
Answer: C
NEW QUESTION 44
Given the code fragment:
Stream<Path> files = Files.walk(Paths.get(System.getProperty("user.home"))); files.forEach (fName -> {//line n1 try { Path aPath = fName.toAbsolutePath();//line n2 System.out.println(fName + ":"
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime ());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. The files in the home directory are listed along with their attributes.
- D. All files and directories under the home directory are listed along with their attributes.
Answer: D
NEW QUESTION 45
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(Integer : : max).get()
- B. nums.stream().max()
- C. nums.stream().map(a -> a).max()
- D. nums.stream().max(Comparator.comparing(a -> a)).get()
Answer: B
NEW QUESTION 46
Given:
What is the result?
- A. 9 25
- B. 3 5
- C. Compilation fails.
- D. 0 0
Answer: B
NEW QUESTION 47
Given the code fragment:
Which two code fragments, when inserted at line n1 independently, result in the output PEEK:
Unix?
- A. .noneMatch ();
- B. .allMatch ();
- C. .anyMatch ();
- D. .findAny ();
- E. .findFirst ();
Answer: E
NEW QUESTION 48
Given:
Item table
ID, INTEGER: PK
DESCRIP, VARCHAR(100)
PRICE, REAL
QUANTITY< INTEGER
And given the code fragment:
9. try {
10.Connection conn = DriveManager.getConnection(dbURL, username,
password);
11. String query = "Select * FROM Item WHERE ID = 110";
12. Statement stmt = conn.createStatement();
13. ResultSet rs = stmt.executeQuery(query);
14.while(rs.next()) {
15.System.out.println("ID:" + rs.getInt("Id"));
16.System.out.println("Description:" + rs.getString("Descrip"));
17.System.out.println("Price:" + rs.getDouble("Price"));
18. System.out.println(Quantity:" + rs.getInt("Quantity"));
19.}
20. } catch (SQLException se) {
21. System.out.println("Error");
22. }
Assume that:
- The required database driver is configured in the classpath.
- The appropriate database is accessible with the dbURL, userName, and
passWord exists.
- The SQL query is valid.
What is the result?
- A. Compilation fails.
- B. An exception is thrown at runtime.
- C. The code prints Error.
- D. The code prints information about Item 110.
Answer: D
NEW QUESTION 49
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. d b e z j
- B. A compilation error occurs.
- C. z b d e j
- D. j z e b d
Answer: D
NEW QUESTION 50
Given that data.txt and alldata.txt are accessible, and the code fragment:
What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?
- A. bw.flush();
- B. br.flush();
- C. bw.writeln();
- D. br.close();
Answer: A
NEW QUESTION 51
Given:
What change should you make to guarantee a single order of execution (printed values 1 -100 in order)?
- A. Line 2: public synchronized int value;
- B. Line 1: class MyClass extends Thread {
- C. Line 3: public synchronized void run() {
- D. Line 2: public volatile int value;
Answer: B
NEW QUESTION 52
Given:
From what threading problem does the program suffer?
- A. starvation
- B. livelock
- C. race condition
- D. deadlock
Answer: D
NEW QUESTION 53
Which two statements are true for a two-dimensional array?
- A. It is implemented as an array of the specified element type.
- B. Using a row by column convention, each row of a two-dimensional array must be of the same size.
- C. All methods of the class Object may be invoked on the two-dimensional array.
- D. At declaration time, the number of elements of the array in each dimension must be specified.
Answer: A,C
NEW QUESTION 54
Given the definition of the Country class:
public class country {
public enum Continent {ASIA, EUROPE}
String name;
Continent region;
public Country (String na, Continent reg) {
name = na, region = reg;
}
public String getName () {return name;}
public Continent getRegion () {return region;}
}
and the code fragment:
List<Country> couList = Arrays.asList (
new Country ("Japan", Country.Continent.ASIA),
new Country ("Italy", Country.Continent.EUROPE),
new Country ("Germany", Country.Continent.EUROPE));
Map<Country.Continent, List<String>> regionNames = couList.stream ()
.collect(Collectors.groupingBy (Country ::getRegion,
Collectors.mapping(Country::getName, Collectors.toList()))));
System.out.println(regionNames);
What is the output?
- A. {ASIA = [Japan], EUROPE = [Italy, Germany]}
- B. {EUROPE = [Italy, Germany], ASIA = [Japan]}
- C. {EUROPE = [Germany, Italy], ASIA = [Japan]}
- D. {EUROPE = [Germany], EUROPE = [Italy], ASIA = [Japan]}
Answer: A
NEW QUESTION 55
Given that data.txt and alldata.txt are accessible, and the code fragment:
What is required at line n1to enable the code to overwrite alldata.txtwith data.txt?
- A. bw.flush();
- B. br.flush();
- C. bw.writeln();
- D. br.close();
Answer: A
NEW QUESTION 56
......
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