Oracle 1z0-809 Dumps Questions Answers

Oracle 1z0-809 Dumps

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Oracle 1z0-809 Frequently Asked Questions

Oracle 1z0-809 Sample Questions

Question # 1

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 () <= 60) {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. User is registered. 
B. An AgeOutOfLimitException is thrown. 
C. A UserException is thrown. 
D. A compilation error occurs in the main method. 

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Question # 2

What is true about the java.sql.Statement interface?

A. It provides a session with the database. 
B. It is used to get an instance of a Connection object by using JDBC drivers. 
C. It provides a cursor to fetch the resulting data. D. It provides a class for executing SQL statements and returning the results. Answer: D
D. It provides a class for executing SQL statements and returning the results. 

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Question # 3

Given:interface Rideable {Car getCar (String name); }class Car {private String name;public Car (String name) {this.name = name;}}Which code fragment creates an instance of Car?

A. Car auto = Car (“MyCar”): : new; 
B. Car auto = Car : : new;Car vehicle = auto : : getCar(“MyCar”); 
C. Rideable rider = Car : : new;Car vehicle = rider.getCar(“MyCar”); 
D. Car vehicle = Rideable : : new : : getCar(“MyCar”); 

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Question # 4

Given:public class Customer {private String fName;private String lName;private static int count;public customer (String first, String last) {fName = first, lName = last;++count;}static { count = 0; }public static int getCount() {return count; }}public class App {public static void main (String [] args) {Customer c1 = new Customer(“Larry”, “Smith”);Customer c2 = new Customer(“Pedro”, “Gonzales”);Customer c3 = new Customer(“Penny”, “Jones”);Customer c4 = new Customer(“Lars”, “Svenson”);c4 = null;c3 = c2;System.out.println (Customer.getCount());}}What is the result?

A. 0 
B. 2 
C. 3 
D. 4 
E. 5 

Show Answer

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Question # 5

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().forEach(System.out::println); //line n1What is the result?

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

Show Answer

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Question # 6

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 stringelements whose length is greater than three?

A. listVal.stream().filter(x -> x.length()>3).count() 
B. listVal.stream().map(x -> x.length()>3).count() 
C. listVal.stream().peek(x -> x.length()>3).count().get() 
D. listVal.stream().filter(x -> x.length()>3).mapToInt(x -> x).count() 

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Question # 7

Given the code fragment:BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2;//line n1System.out.println(val.apply(10, 10.5));What is the result?

A. 20 
B. 20.5 
C. A compilation error occurs at line n1. 
D. A compilation error occurs at line n2. 

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Question # 8

Given:public class Counter {public static void main (String[ ] args) {int a = 10;int b = -1;assert (b >=1) : “Invalid Denominator”;int = a / b;System.out.println (c);}}What is the result of running the code with the –da option?

A. -10 
B. 0 
C. An AssertionError is thrown. 
D. A compilation error occurs. 

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Question # 9

Given that /green.txt and /colors/yellow.txt are accessible, and the code fragment:Path source = Paths.get(“/green.txt);Path target = Paths.get(“/colors/yellow.txt);Files.move(source, target, StandardCopyOption.ATOMIC_MOVE);Files.delete(source);Which statement is true?

A. The green.txt file content is replaced by the yellow.txt file content and the yellow.txt fileis deleted. 
B. The yellow.txt file content is replaced by the green.txt file content and an exception isthrown. 
C. The file green.txt is moved to the /colors directory. 
D. A FileAlreadyExistsException is thrown at runtime. 

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Question # 10

Given the code fragment:Path source = Paths.get (“/data/december/log.txt”);Path destination = Paths.get(“/data”);Files.copy (source, destination);and assuming that the file /data/december/log.txt is accessible and contains:10-Dec-2014 – Executed successfullyWhat is the result?

A. A file with the name log.txt is created in the /data directory and the content of the/data/december/log.txt file is copied to it. 
B. The program executes successfully and does NOT change the file system. 
C. A FileNotFoundException is thrown at run time. 
D. A FileAlreadyExistsException is thrown at run time. 

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Question # 11

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 maximumnumber 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() 

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Question # 12

Given the code fragment:BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2; //line n1//line n2System.out.println(val.apply(10, 10.5));What is the result?

A. 20 
B. 20.5 
C. A compilation error occurs at line n1. 
D. A compilation error occurs at line n2. 

Show Answer

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Question # 13

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 ()) {if (aFile.getName ().endsWith (“.class”))aFile.delete ();}}}}Assume that Projects contains subdirectories that contain .class files and is passed as anargument 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. 

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Question # 14

Given:final class Folder {//line n1//line n2public 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 Closeable { 
C. Replace line n1 with:class Folder extends Exception { 
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”);} 

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Question # 15

Given:class Book {int id;String name;public Book (int id, String name) {this.id = id;this.name = name;}public boolean equals (Object obj) { //line n1boolean output = false;Book b = (Book) obj;if (this.id = = b.id) {output = true;}return output;}}and the code fragment:Book b1 = new Book (101, “Java Programing”);Book b2 = new Book (102, “Java Programing”);System.out.println (b1.equals(b2)); //line n2Which statement is true?

A. The program prints true. 
B. The program prints false.
C. A compilation error occurs. To ensure successful compilation, replace line n1with:boolean equals (Book obj) { 
D. A compilation error occurs. To ensure successful compilation, replace line n2with:System.out.println (b1.equals((Object) b2)); 

Show Answer

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Question # 16

Given:class ImageScanner implements AutoCloseable {public void close () throws Exception {System.out.print (“Scanner closed.”);}public void scanImage () throws Exception {System.out.print (“Scan.”);throw new Exception(“Unable to scan.”);}}class ImagePrinter implements AutoCloseable {public void close () throws Exception {System.out.print (“Printer closed.”);}public void printImage () {System.out.print(“Print.”); }}and this code fragment:try (ImageScanner ir = new ImageScanner();ImagePrinter iw = new ImagePrinter()) {ir.scanImage();iw.printImage();} catch (Exception e) {System.out.print(e.getMessage());}What is the result?

A. Scan.Printer closed. Scanner closed. Unable to scan. 
B. Scan.Scanner closed. Unable to scan. 
C. Scan. Unable to scan. 
D. Scan. Unable to scan. Printer closed. 

Show Answer

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Question # 17

Given:class Worker extends Thread {CyclicBarrier cb;public Worker(CyclicBarrier cb) { this.cb = cb; }public void run () {try {cb.await();System.out.println(“Worker…”);} catch (Exception ex) { }}}class Master implements Runnable { //line n1public void run () {System.out.println(“Master…”);}}and the code fragment:Master master = new Master();//line n2Worker worker = new Worker(cb);worker.start();You have been asked to ensure that the run methods of both the Worker and Masterclasses are executed.Which modification meets the requirement?

A. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master); 
B. Replace line n1 with class Master extends Thread { 
C. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master); 
D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master); 

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Question # 18

Which two code blocks correctly initialize a Locale variable? (Choose two.)

A. Locale loc1 = “UK”; 
B. Locale loc2 = Locale.getInstance(“ru”); 
C. Locale loc3 = Locale.getLocaleFactory(“RU”); 
D. Locale loc4 = Locale.UK; 
E. Locale loc5 = new Locale (“ru”, “RU”); 

Show Answer

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Question # 19

Given the code fragment:String str = “Java is a programming language”;ToIntFunction<String> indexVal = str: : indexOf; //line n1int x = indexVal.applyAsInt(“Java”);//line n2System.out.println(x);What is the result?

A. 0 
B. 1 
C. A compilation error occurs at line n1. 
D. A compilation error occurs at line n2. 

Show Answer

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Question # 20

Given the definition of the Vehicle class:Class Vehhicle {int distance;//line n1Vehicle (int x) {this distance = x;}public void increSpeed(int time) {//line n2int timeTravel = time;//line n3class Car {int value = 0;public void speed () {value = distance /timeTravel;System.out.println (“Velocity with new speed”+value+”kmph”);}}new Car().speed();}}and this code fragment:Vehicle v = new Vehicle (100);v.increSpeed(60);What is the result?

A. Velocity with new speed 
B. A compilation error occurs at line n1. 
C. A compilation error occurs at line n2. 
D. A compilation error occurs at line n3. 

Show Answer

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Question # 21

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).ifPresent(System.out: :println);What is the result?

A. 2 : 30 
B. 4 : 0 
C. 4 : 70 
D. 4 : 602 : 303 : 201 : 10 
E. The program prints nothing. 

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Question # 22

Given that course.txt is accessible and contains:Course : : Javaand 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.close()) { //line n1isr.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. 

Show Answer

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Question # 23

Assume customers.txt is accessible and contains multiple lines.Which code fragment prints the contents of the customers.txt file?

A. Stream<String> stream = Files.find (Paths.get (“customers.txt”));stream.forEach((Stringc) -> System.out.println(c)); 
B. Stream<Path> stream = Files.find (Paths.get (“customers.txt”));stream.forEach( c) ->System.out.println(c)); 
C. Stream<Path> stream = Files.list (Paths.get (“customers.txt”));stream.forEach( c) ->System.out.println(c)); 
D. Stream<String> lines = Files.lines (Paths.get (“customers.txt”));lines.forEach( c) ->System.out.println(c)); 

Show Answer

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Question # 24

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”));}}andpublic 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 n1System.out.println(str1+ “:” + str2);}What is the result?

A. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate. 
B. The program terminates after printing:Run RunnerCall Caller : Run 
C. A compilation error occurs at line n1. 
D. An Execution is thrown at run time. 

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Question # 25

Given the code fragment:List<String> nL = Arrays.asList(“Jim”, “John”, “Jeff”);Function<String, String> funVal = s -> “Hello : “.concat(s);nL.Stream().map(funVal).forEach(s-> System.out.print (s));What is the result?

A. Hello : Jim Hello : John Hello : Jeff 
B. Jim John Jeff 
C. The program prints nothing. 
D. A compilation error occurs. 

Show Answer

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