Latest Oracle 1z0-809 Practice Test Questions, Java SE 8 Programmer II Exam Dumps
Jul-2023 Pass Oracle 1z0-809 Exam in First Attempt Easily
NEW QUESTION # 57
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. es.submit(r1);Future<String> f1 = es.submit (c1);
- B. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
- C. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>) es.execute(c1);
- D. es.execute (r1);Future<String> f1 = es.execute (c1) ;
Answer: A
NEW QUESTION # 58
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?
- A. Searching...
Searching...
Searching... - B. A compilation error occurs.
- C. Searching...
- D. Searching...
Searching...
Answer: B
NEW QUESTION # 59
Given the code fragments:
and
What is the result?
- A. Optional[France]
Not Found - B. France
Optional[NotFound] - C. France
Not Found - D. Optional [France]
Optional [NotFound]
Answer: C
NEW QUESTION # 60
Given:
What is the result?
- A. The loop executes infinite times
- B. The sum is 15
- C. Compilation fails
- D. The sum is 14
- E. The sum is 2
Answer: C
NEW QUESTION # 61
Given the code snippet from a compiled Java source file:
Which command-line arguments should you pass to the program to obtain the following output?
Arg is 2
- A. java MyFile 2 1 2
- B. java MyFile 0 1 2 3
- C. java MyFile 1 3 2 2
- D. java MyFile 1 2 2 3 4
Answer: C
NEW QUESTION # 62
Given the code fragment:
class CallerThread implements Callable<String> {
String str;
public CallerThread(String s) {this.str=s;}
public String call() throws Exception {
return str.concat("Call");
}
}
and
public static void main (String[] args) throws InterruptedException,
ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1
Future f1 = es.submit (newCallerThread("Call"));
String str = f1.get().toString();
System.out.println(str);
}
Which statement is true?
- A. A compilation error occurs at line n1.
- B. An ExecutionExceptionis thrown at run time.
- C. The program prints Call Calland does not terminate.
- D. The program prints Call Calland terminates.
Answer: C
NEW QUESTION # 63
Given:
And given the commands:
What is the result?
- A. Failure
- B. Compilation fails.
- C. Success
- D. An exception is thrown at runtime.
Answer: A
NEW QUESTION # 64
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?
- A. Stream<Path> stream = Files.list (Paths.get ("customers.txt"));stream.forEach( c) ->
System.out.println(c)); - B. Stream<String> lines = Files.lines (Paths.get ("customers.txt"));lines.forEach( c) ->
System.out.println(c)); - C. Stream<String> stream = Files.find (Paths.get ("customers.txt"));stream.forEach((String c) ->
System.out.println(c)); - D. Stream<Path> stream = Files.find (Paths.get ("customers.txt"));stream.forEach( c) ->
System.out.println(c));
Answer: B
NEW QUESTION # 65
Given the code fragment:
Which two modifications should you make so that the code compiles successfully?
- A. Replace line 5 with public void printFileContent ( ) throws IOException (
- B. Replace line 11 with public static void main (String [ ] args) throws Exception (
- C. Replace line 13 with:
- D. At line 14, insert throw new IOException ( );
- E. Replace line 7 with throw IOException ("Exception raised");
Answer: A,B
NEW QUESTION # 66
Given:
Book.java:
public class Book {
private String read(String bname) { return "Read" + bname }
}
EBook.java:
public class EBook extends Book {
public class String read (String url) { return "View" + url }
}
Test.java:
public class Test {
public static void main (String[] args) {
Book b1 = new Book();
b1.read("Java Programing");
Book b2 = new EBook();
b2.read("http://ebook.com/ebook");
}
}
What is the result?
- A. Read Java Programming Read http:/ ebook.com/ebook
- B. The EBook.java file fails to compile.
- C. The Test.java file fails to compile.
- D. Read Java Programming View http:/ ebook.com/ebook
Answer: C
NEW QUESTION # 67
Given the code fragment:
Path file = Paths.get ("courses.txt");
// line n1
Assume the courses.txtis accessible.
Which code fragment can be inserted at line n1to enable the code to print the content of the courses.txtfile?
- A. List<String> fc = readAllLines(file);
fc.stream().forEach (s - > System.out.println(s)); - B. Stream<String> fc = Files.lines (file);
fc.forEach (s - > System.out.println(s)); - C. Stream<String> fc = Files.readAllLines (file);
fc.forEach (s - > System.out.println(s)); - D. List<String> fc = Files.list(file);
fc.stream().forEach (s - > System.out.println(s));
Answer: C
NEW QUESTION # 68
Which two statements are true about synchronization and locks? (Choose two.)
- A. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
- B. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.
- C. A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that method.
- D. A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.
- E. Threads cannot acquire intrinsic locks on classes.
Answer: A,B
NEW QUESTION # 69
Given the code fragment:
Which three lines fail to compile?
- A. line 10
- B. line 8
- C. line 7
- D. line 11
- E. line 9
- F. line 12
Answer: A,C,F
NEW QUESTION # 70
Given the following class:
Which two changes would encapsulate this class and ensure that the area field is always equal to length * height whenever the Rectangle class is used?
- A. Change the area field to public.
- B. Call the setArea method at the end of the setLength method.
- C. Call the setArea method at the beginning of the setHeight method.
- D. Call the setArea method at the end of the setHeight method.
- E. Call the setArea method at the beginning of the setLength method.
- F. Change the setArea method to private.
Answer: A,F
NEW QUESTION # 71
Given the definition of the Emp class:
public class Emp
private String eName;
private Integer eAge;
Emp(String eN, Integer eA) {
this.eName = eN;
this.eAge = eA;
}
public Integer getEAge () {return eAge;}
public String getEName () {return eName;}
}
and code fragment:
List<Emp>li = Arrays.asList(new Emp("Sam", 20), New Emp("John", 60), New Emp ("Jim", 51)); Predicate<Emp> agVal = s -> s.getEAge() > 50; //line n1 li = li.stream().filter(agVal).collect(Collectors.toList()); Stream<String> names = li.stream()map.(Emp::getEName); //line n2 names.forEach(n -> System.out.print(n + " ")); What is the result?
- A. A compilation error occurs at line n1.
- B. John Jim
- C. Sam John Jim
- D. A compilation error occurs at line n2.
Answer: B
NEW QUESTION # 72
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