Java 8-12 Features Quiz

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Java modern features

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Jeni Alex

India

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Java 8-12 Features QuizOnline version Java modern features by Jeni Alex 1 Q1. True or False: Lambda expressions are a Java 8 feature. a True b Method references are not Java 8 features c Anonymous inner classes d False 2 Q2. Fill in the blank: Optional helps to avoid _____. a NullPointerException b ClassNotFoundException c IllegalArgumentException d ArrayIndexOutOfBoundsException 3 Q3. Fill in the blank: Default methods in interfaces allow adding new ____ without breaking existing implementations. a fields b exceptions c constructors d methods 4 Q4. Fill in the blank: To collect a stream into a List, use stream.collect(____). a Collectors.toMap() b Collectors.joining() c Collectors.toList() d Collectors.toSet() 5 class Demo { public static void main(String[] args) { String s = "HELLO"; System.out.println(s.substring(1, 4)); } } Output is ELL a True b False 6 Q6. Fill in the blank: The 'var' keyword for local variable type inference was introduced in Java ____. a 10 b 12 c 8 d 11 7 Q7. Coding: Given List names, which result type is produced by names.stream().map(String::length).collect(Collectors.toList())? a List b List c List d List 8 List.of() allows duplicate elements. a True b False 9 class Demo { public static void main(String[] args) { Optional o = Optional.empty(); String v = o.orElseThrow(() -> new IllegalArgumentException("Missing")); System.out.println(v); } } a True b False 10 Q10. Fill in the blank: What keyword marks a static method in an interface (Java 8+)? a default b static c abstract d private

Java 8-12 Features QuizOnline version

Java modern features

by Jeni Alex

Q1. True or False: Lambda expressions are a Java 8 feature.

True

Method references are not Java 8 features

Anonymous inner classes

False

Q2. Fill in the blank: Optional helps to avoid _____.

NullPointerException

ClassNotFoundException

IllegalArgumentException

ArrayIndexOutOfBoundsException

Q3. Fill in the blank: Default methods in interfaces allow adding new ____ without breaking existing implementations.

fields

exceptions

constructors

methods

Q4. Fill in the blank: To collect a stream into a List, use stream.collect(____).

Collectors.toMap()

Collectors.joining()

Collectors.toList()

Collectors.toSet()

class Demo { public static void main(String[] args) { String s = "HELLO"; System.out.println(s.substring(1, 4)); } } Output is ELL

True

False

Q6. Fill in the blank: The 'var' keyword for local variable type inference was introduced in Java ____.

Q7. Coding: Given List names, which result type is produced by names.stream().map(String::length).collect(Collectors.toList())?

List

List.of() allows duplicate elements.

True

False

class Demo { public static void main(String[] args) { Optional o = Optional.empty(); String v = o.orElseThrow(() -> new IllegalArgumentException("Missing")); System.out.println(v); } }

True

False

Q10. Fill in the blank: What keyword marks a static method in an interface (Java 8+)?

default

static

abstract

private

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Java 8-12 Features Quiz

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About this activity

Created by

Download the paper version to play

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Java 8-12 Features QuizOnline version

by Jeni Alex

Q1. True or False: Lambda expressions are a Java 8 feature.

Q2. Fill in the blank: Optional helps to avoid _____.

Q3. Fill in the blank: Default methods in interfaces allow adding new ____ without breaking existing implementations.

Q4. Fill in the blank: To collect a stream into a List, use stream.collect(____).

class Demo { public static void main(String[] args) { String s = "HELLO"; System.out.println(s.substring(1, 4)); } } Output is ELL

Q6. Fill in the blank: The 'var' keyword for local variable type inference was introduced in Java ____.

Q7. Coding: Given List names, which result type is produced by names.stream().map(String::length).collect(Collectors.toList())?

List.of() allows duplicate elements.

class Demo { public static void main(String[] args) { Optional o = Optional.empty(); String v = o.orElseThrow(() -> new IllegalArgumentException("Missing")); System.out.println(v); } }

Q10. Fill in the blank: What keyword marks a static method in an interface (Java 8+)?