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New Java SE 1z0-809 Exam Practice Questions

Total 196 Questions

Last Updated On: 15-Apr-2025

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Question # 1

Given the code format: Which code fragment must be inserted at line 6 to enable the code to compile?
A. DBConfiguration f; return f;
B. Return DBConfiguration;
C. Return new DBConfiguration;
D. Retutn 0;

Return DBConfiguration;

Question # 2

View the exhibit. Which change enables the code to print the following? James age: 20 Williams age: 32
A. Replacing line 5 with public static void main (String [] args) throws MissingInfoException, AgeOutofRangeException {
B. Replacing line 5 with public static void main (String [] args) throws.Exception {
C. Enclosing line 6 and line 7 within a try block and adding: catch(Exception e1) { //code goes here} catch (missingInfoException e2) { //code goes here} catch (AgeOutofRangeException e3) {//code goes here}
D. Enclosing line 6 and line 7 within a try block and adding: catch (missingInfoException e2) { //code goes here} catch (AgeOutofRangeException e3) {//code goes here}

Enclosing line 6 and line 7 within a try block and adding:
catch(Exception e1) { //code goes here}
catch (missingInfoException e2) { //code goes here}
catch (AgeOutofRangeException e3) {//code goes here}

Question # 3

Given the code fragment: List<String> str = Arrays.asList (“my”, “pen”, “is”, “your’, “pen”); Predicate<String> test = s -> { int i = 0; boolean result = s.contains (“pen”); System.out.print(i++) + “:”); return result; }; str.stream() .filter(test) .findFirst() .ifPresent(System.out ::print); What is the result?
A. 0 : 0 : pen
B. 0 : 1 : pen
C. 0 : 0 : 0 : 0 : 0 : pen
D. 0 : 1 : 2 : 3 : 4 :
E. A compilation error occurs.

A compilation error occurs.

Question # 4

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 IceCream.
B. A compilation error occurs in Cake.
C. A compilation error occurs in Shop.
D. A compilation error occurs in Bread
E. All classes compile successfully.

A compilation error occurs in Bread

Question # 5

Given the code fragments: interface CourseFilter extends Predicate<String> { public default boolean test (String str) { return str.equals (“Java”); } } and List<String> strs = Arrays.asList(“Java”, “Java EE”, “Java ME”); Predicate<String> cf1 = s - > s.length() > 3; Predicate cf2 = new CourseFilter() { //line n1 public boolean test (String s) { return s.contains (“Java”); } }; long c = strs.stream() .filter(cf1) .filter(cf2//line n2 .count(); System.out.println(c); What is the result?
A. 2
B. 3
C. A compilation error occurs at line n1.
D. A compilation error occurs at line n2.

Question # 6

Which statement is true about java.util.stream.Stream?
A. A stream cannot be consumed more than once.
B. The execution mode of streams can be changed during processing.
C. Streams are intended to modify the source data.
D. A parallel stream is always faster than an equivalent sequential stream

The execution mode of streams can be changed during processing.

Question # 7

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 : 60
D. 4 : 60 2 : 30 3 : 20 1 : 10
E. The program prints nothing.

4 : 60
2 : 30
3 : 20
1 : 10

Oracle 1z0-809 Exam Dumps

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