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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. 

Show Answer

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

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

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. 

Show Answer

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. 

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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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