1Z0-809 Practice Exam — Free Oracle Certification Prep

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225Practice Questions

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Question 1

Java Class Design

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

A You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
B You expect that unrelated classes would implement your interfaces.
C You want to share code among several closely related classes.
D You want to declare non-static on non-final fields.
E You want to take advantage of multiple inheritance of type.

Question 2

Generics and Collections

Question 3

Lambda Built-in Functional Interfaces

Question 5

Java Stream API

Question 6

Exception Handling and Assertions

Question 7

Java Class Design

Question 8

Exception Handling and Assertions

Question 9

Generics and Collections

Question 10

Java I/O Fundamentals

Question 13

Java Stream API

Question 14

Java Stream API

Question 15

Java Stream API

Question 18

Java Class Design

Question 20

Exception Handling and Assertions

Question 23

Java Stream API

Question 24

Java Class Design

Question 26

Java SE 8 Date/Time API

Question 28

Java Stream API

Question 31

Java Class Design

Question 32

Exception Handling and Assertions

Question 33

Java Stream API

Question 34

Java Stream API

Question 35

Java Stream API

Question 36

Java I/O Fundamentals

Question 37

Creating Database Applications with JDBC

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

Given the code fragment:
List<Integer> list1 = Arrays.asList(10, 20);
List<Integer> list2 = Arrays.asList(15, 30);
//line n1
Which code fragment, when inserted at line n1, prints 10 20 15 30?

A Stream.of(list1, list2) .flatMap(list -> list.stream()) .forEach(s -> System.out.print(s + " "));
B Stream.of(list1, list2) .flatMap(list -> list.intStream()) .forEach(s -> System.out.print(s + " "));
C list1.stream() .flatMap(list2.stream().flatMap(e1 -> e1.stream()) .forEach(s -> System.out.println(s + " "));
D Stream.of(list1, list2) .flatMapToInt(list -> list.stream()) .forEach(s -> System.out.print(s + " "));

Question 7

Java Class Design

Question 8

Exception Handling and Assertions

Question 9

Generics and Collections

Question 10

Java I/O Fundamentals

Question 13

Java Stream API

Question 14

Java Stream API

Question 15

Java Stream API

Question 18

Java Class Design

Question 20

Exception Handling and Assertions

Question 23

Java Stream API

Question 24

Java Class Design

Question 26

Java SE 8 Date/Time API

Question 28

Java Stream API

Question 31

Java Class Design

Question 32

Exception Handling and Assertions

Question 33

Java Stream API

Question 34

Java Stream API

Question 35

Java Stream API

Question 36

Java I/O Fundamentals

Question 37

Creating Database Applications with JDBC

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