Latest [Jan 02, 2022] 1z0-809 Exam Questions – Valid 1z0-809 Dumps Pdf
1z0-809 Practice Test Questions Answers Updated 195 Questions
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NEW QUESTION 53
Given the code fragment:
List<String> colors = Arrays.asList("red", "green", "yellow");
Predicate<String> test = n - > {
System.out.println("Searching...");
return n.contains("red");
};
colors.stream()
.filter(c -> c.length() > 3)
.allMatch(test);
What is the result?
Searching...
- A. Searching...
Searching... - B. Searching...
- C. Searching...
Searching... - D. A compilation error occurs.
Answer: B
Explanation:
Explanation
NEW QUESTION 54
Given:
and the command:
java Product 0
What is the result?
- A. New Price: 0.0
- B. An AssertionError is thrown.
- C. A NumberFormatException is thrown at run time.
- D. A compilation error occurs at line n1.
Answer: C
NEW QUESTION 55
Given the code fragment:
What is the result?
- A. 6 : 5 : 6
- B. 3 : 3 : 4
- C. 4 : 4 : 4
- D. 5 : 3 : 6
Answer: C
NEW QUESTION 56
Given the Greetings.properties file, containing:
and given:
What is the result?
- A. Goodbye everyone!
- B. GOODBY_MSG
- C. HELLO_MSG
- D. Compilation fails.
- E. Hello, everyone!
Answer: D
NEW QUESTION 57
Given:
What is the result?
- A. 6 8 10
- B. 6 7 8
- C. Compilation fails
- D. 0 1 2
- E. 7 8 9
Answer: B
NEW QUESTION 58
Given: What is the result?
- A. Second Exception
- B. First Exception Done
- C. 0 Done
- D. Done Third Exception
- E. Third Exception
Answer: B
NEW QUESTION 59
Given the code fragment:
List<String> codes = Arrays.asList ("DOC", "MPEG", "JPEG");
codes.forEach (c -> System.out.print(c + " "));
String fmt = codes.stream()
. filter (s-> s.contains ("PEG"))
. reduce((s, t) -> s + t).get();
System.out.println("\n" + fmt);
What is the result?
- A. DOC MPEG MPEGJPEG
MPEGMPEGJPEG - B. DOC MPEG JPEG
MPEGJPEG - C. MPEGJPEG
MPEGJPEG - D. The order of the output is unpredictable.
Answer: B
NEW QUESTION 60
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(scr));
What is the result?
- A. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago][Java EE: Helen:Houston]
- B. Java EEJava ME
- C. [Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
- D. A compilation error occurs.
Answer: B
NEW QUESTION 61
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. j z e b d
- B. z b d e j
- C. d b e z j
- D. A compilation error occurs.
Answer: A
NEW QUESTION 62
Given that version.txtis accessible and contains:
1234567890
and given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. The program prints nothing.
Answer: C
NEW QUESTION 63
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. 1:Pics:/Pics/ MyPic.jpeg
- C. 2:MyPic.jpeg: MyPic.jpeg
- D. 2:Pics: MyPic.jpeg
Answer: C
NEW QUESTION 64
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(scr));
What is the result?
[Java EE: Helen:Houston]
- A. [Java EE: Helen:Houston]
- B. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
Java EE - C. Java ME
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] - D. A compilation error occurs.
Answer: C
NEW QUESTION 65
Given the code fragment:
What is the result?
Word: why what when
- A. Word: why Word: why what Word: why what when
- B. Word: why Word: what Word: when
- C.
- D. Compilation fails at line n1.
Answer: A
NEW QUESTION 66
Given:
What is the result?
- A. 0
- B. 1
- C. 2
- D. Compilation fails.
- E. 3
Answer: C
Explanation:
trim removes all whitespaces, this will create the String "JavaDuke" which contains 8 characters
NEW QUESTION 67
Given:
public final class IceCream {
public void prepare() {}
}
public class Cake {
public final void bake(int min, int temp) {}
public void mix() {}
}
public class Shop {
private Cake c = new Cake ();
private final double discount = 0.25;
public void makeReady () { c.bake(10, 120); }
}
public class Bread extends Cake {
public void bake(int minutes, int temperature) {}
public void addToppings() {}
}
Which statement is true?
- A. A compilation error occurs in Cake.
- B. All classes compile successfully.
- C. A compilation error occurs in Bread
- D. A compilation error occurs in IceCream.
- E. A compilation error occurs in Shop.
Answer: C
NEW QUESTION 68
Given:
And given the code fragment:
Which two modifications enable the code to print the following output?
Canine 60 Long
Feline 80 Short
- A. Replace line n2 with:
super (type, maxSpeed) ;
this.bounds = bounda; - B. Replace line n1 with:
this ("Canine",60);
this.bounds = bounds; - C. Replace line n1 with:
this.bounds = bounda;
super ( ) ; - D. Replace line n2 with:
super (type,maxSpeed) ;
this (bounds) ; - E. Replace line n1 with:
super ( ) ;
this.bounds = bounds;
Answer: E
NEW QUESTION 69
Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1 to start r1 and c1 threads?
- A. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>) es.execute(c1);
- B. es.submit(r1);Future<String> f1 = es.submit (c1);
- C. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
- D. es.execute (r1);Future<String> f1 = es.execute (c1) ;
Answer: B
NEW QUESTION 70
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. Checking...
- D. Checking...
Checking...
Answer: A
NEW QUESTION 71
Given the code fragment:
BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2;//line n1
System.out.println(val.apply(10, 10.5));
What is the result?
- A. A compilation error occurs at line n1.
- B. 0
- C. A compilation error occurs at line n2.
- D. 20.5
Answer: A
NEW QUESTION 72
Given the code fragments:
class Employee {
Optional<Address> address;
Employee (Optional<Address> address) {
this.address = address;
}
public Optional<Address> getAddress() { return address; }
}
class Address {
String city = "New York";
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = null;
Optional<Address> addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not available"; What is the result?
- A. A NoSuchElementException is thrown at run time.
- B. New York
- C. null
- D. City Not available
Answer: C
NEW QUESTION 73
Given: What is the result?
- A. Compilation fails due to an error in line n1
- B. Compilation fails due to an error at line n3
- C. Compilation fails due to an error at line n2
- D. 100 210
Answer: C
NEW QUESTION 74
Which statement best describes encapsulation?
- A. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
- B. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
- C. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.
- D. Encapsulation ensures that classes can be designed so that their methods are inheritable.
Answer: B
Explanation:
http://www.tutorialspoint.com/java/java_encapsulation.htm
NEW QUESTION 75
public class StringReplace {
public static void main(String[] args) {
String message = "Hi everyone!";
System.out.println("message = " + message.replace("e", "X")); }
}
What is the result?
- A. message = Hi XvXryonX!
- B. A compile time error is produced.
- C. message = Hi Xveryone!
- D. A runtime error is produced.
- E. message =
- F. message = Hi everyone!
Answer: A
NEW QUESTION 76
......
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