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All Java 8 Solutions on Gang of Coders
Total of 453 Java 8 Solutions
Explicitly calling a default method in Java
Java
Inheritance
Interface
Java 8
Default Method
How to flatmap a stream of streams in Java?
Java
Java 8
Java Stream
In Java 8, why were Arrays not given the forEach method of Iterable?
Java
Arrays
Foreach
Java 8
Javac
Null safe date comparator for sorting in Java 8 Stream
Java
Java 8
Java Stream
Java 8 - omitting tedious collect method
Java
Java 8
Java Stream
What is difference between Collection.stream().forEach() and Collection.forEach()?
Java
Collections
Java 8
Java Stream
will android java support lambda expression in java 8?
Java
Android
Dalvik
Java 8
Java Lambda expressions
Java
Lambda
Java 8
Swing rendering appears broken in JDK 1.8, correct in JDK 1.7
Java
Swing
Rendering
Nvidia
Java 8
Does Java 8 lack a Stream.concat working on a varags of streams?
Java
Java 8
Java Stream
Java 8 way to work with an enum
Java
Enums
Java 8
Concat VS Merge operator
Java
Java 8
Rx Java
How does Java 8' new default interface model works (incl. diamond, multiple inheritance, and precedence)?
Java
Java 8
How do you assign a lambda to a variable in Java 8?
Java
Lambda
Java 8
Why are new java.util.Arrays methods in Java 8 not overloaded for all the primitive types?
Java
Arrays
Java 8
How to apply multiple predicates to a java.util.Stream?
Java
Lambda
Java 8
Java Stream
Predicate
How do I get an IntStream from a List<Integer>?
Java
Collections
Java 8
Java Stream
Boxing
How do Java 8 array constructor references work?
Java
Arrays
Java 8
Method Reference
Is .collect guaranteed to be ordered on parallel streams?
Java
List
Java 8
In Java 8, is there a ByteStream class?
Java
Java 8
Byte
Java Stream
Boxing
Java 8 Convert given time and time zone to UTC time
Java
Java 8
Utc
Java Time
Why Instant does not support operations with ChronoUnit.YEARS?
Java
Java 8
Openjdk
Java Stream difference between map and mapToObj
Java
Java 8
Java Stream
Why is Java 14 not LTS?
Java
Java 8
Java 11
Java 14
Lts
Is "Java Concurrency In Practice" still valid?
Java
Concurrency
Java 8
Java 7
Converting Array to List
Arrays
Java 8
Do Java 8 default methods break source compatibility?
Java
Java 8
Default Method
Forward Compatibility
Getting object with max date property from list of objects Java 8
Java
Collections
Java 8
How to get 5 years before now
Java
Java 8
Constructor reference - no warning when generics array is created
Java
Generics
Java 8
Language Lawyer
Why is shared mutability bad?
Java
Java 8
Java Stream
Immutability
Java 8 peek vs map
Java
Java 8
Different generic behaviour when using lambda instead of explicit anonymous inner class
Java
Generics
Lambda
Java 8
Java 8 Streams: multiple filters vs. complex condition
Java
Lambda
Filter
Java 8
Java Stream
Simplest way to print an `IntStream` as a `String`
Java
Java 8
Java Stream
Stream and lazy evaluation
Java
Java 8
Java Stream
Group by and sum objects like in SQL with Java lambdas?
Java
Lambda
Java 8
Java Stream
Lazy field initialization with lambdas
Lambda
Java 8
Lazy Initialization
Avoid NoSuchElementException with Stream
Java
Java 8
Java Stream
Optional
Java 8 lambdas group list into map
Java
Java 8
Java Stream
java.lang.NullPointerException is thrown using a method-reference but not a lambda expression
Java
Lambda
Nullpointerexception
Java 8
Method Reference
Close Java 8 Stream
Java
Java 8
Java Stream
Why does Stream<T> not implement Iterable<T>?
Java
Java 8
Java Stream
Iterable
Java 11 -- performance regressions against Java 8?
Performance
Java 8
Java 11
Microbenchmark
Jmh
How to install Java 8 on Mac
Java
Macos
Java 8
Installation
Is there a jackson datatype module for JDK8 java.time?
Jackson
Java 8
Java Time
Jackson Modules
Can program developed with Java 8 be run on Java 7?
Java
Backwards Compatibility
Java 8
Java Server
Java 8 method references: provide a Supplier capable of supplying a parameterized result
Java
Java 8
Java Stream
Where is the Java 8 Consumer with more than one argument?
Java
C#
Lambda
Java 8
Java Stream
Java 8 - DateTimeFormatter and ISO_INSTANT issues with ZonedDateTime
Java
Java 8
Java Time
CompletableFuture, supplyAsync() and thenApply()
Multithreading
Java 8
Concurrency
Completable Future
Futuretask
Convert String array to Map using Java 8 Lambda expressions
Java
Lambda
Functional Programming
Java 8
Java Stream
Java 8 Lambda: Comparator
Java
Lambda
Java 8
Comparator
Differences between Java 8 Date Time API (java.time) and Joda-Time
Java
Datetime
Java 8
Jodatime
Java Time
Why use Optional.of over Optional.ofNullable?
Java
Java 8
Nullpointerexception
Null
Optional
Reflection type inference on Java 8 Lambdas
Java
Generics
Reflection
Lambda
Java 8
What is sjavac, who is it for and how do I use it?
Java
Java 8
Javac
Java 9
What's the purpose of partitioningBy
Java
Java 8
Collectors
Using lambda to format Map into String
Java
Dictionary
Lambda
Java 8
Missed opportunity to fix JDBC date handling in Java 8?
Java
Date
Jdbc
Java 8
OptionalInt vs Optional<Integer>
Java
Generics
Java 8
Language Design
Removing Java 8 JDK from Mac
Java
Macos
Intellij Idea
Java 8
How can I create a Java 8 LocalDate from a long Epoch time in Milliseconds?
Java
Datetime
Java 8
Java Time
Filter Java Stream to 1 and only 1 element
Java
Lambda
Java 8
Java Stream
How to map to multiple elements with Java 8 streams?
Java
Lambda
Closures
Java 8
Java Stream
Why doesn't java.util.Collection implement the new Stream interface?
Java
Lambda
Functional Programming
Java 8
Java Stream
Java 8 Lambda filter by Lists
Java
Lambda
Java 8
How to sum values in a Map with a stream?
Java
Java 8
Java Stream
Generics
New object instantiation when using Java 8 streams
Java
Lambda
Java 8
Java Stream
Method Reference
Transform and filter a Java Map with streams
Java
Java 8
Java Stream
Collectors
SimpleDateFormat with German Locale - Java 8 vs Java 10+
Java
Java 8
Simpledateformat
Java 9
Java 10
Why does Java not allow multiple inheritance but does allow conforming to multiple interfaces with default implementations
Java
Inheritance
Interface
Java 8
Abstract
Why does the Java compiler 11 use invokevirtual to call private methods?
Java
Java 8
Jvm
Javac
Java 11
Using Java 8's Optional with Stream::flatMap
Java
Lambda
Java 8
Java Stream
Does Java 8 Support Closures?
Java
Lambda
Closures
Java 8
Version 1.8 of project facet java does not exist
Java
Eclipse
Maven
M2eclipse
Java 8
Java 8 Unsafe: xxxFence() instructions
Java
Concurrency
Java 8
Unsafe
Memory Fences
Java 8 Time API: how to parse string of format "MM.yyyy" to LocalDate
Java
Date
Java 8
Java Time
How to correctly determine that an object is a lambda?
Java
Lambda
Java 8
Why there is no BooleanConsumer in Java 8?
Java
Function
Java 8
In Java 8, transform Optional<String> of an empty String in Optional.empty
Java
Java 8
Optional
Is Joda Time deprecated with java 8 Date and Time API? (java.time)
Java 8
Jodatime
Deprecated
Java Time
How to find distinct rows with field in list using JPA and Spring?
Java
Spring
Hibernate
Jpa
Java 8
Java 8 lambda comparator with null value check
Lambda
Java 8
Java 8 calculate months between two dates
Java
Java 8
Java 8 list processing - add elements conditionally
Java
Collections
Java 8
Java Stream
Java 8 lambda Void argument
Java
Lambda
Java 8
Void
Difference between `Optional.orElse()` and `Optional.orElseGet()`
Java
Java 8
Optional
Why does Iterable<T> not provide stream() and parallelStream() methods?
Java
Java 8
Java Stream
Iterable
Java8: HashMap<X, Y> to HashMap<X, Z> using Stream / Map-Reduce / Collector
Java
Mapreduce
Java 8
Java Stream
Collectors
Using streams to convert a list of objects into a string obtained from the toString method
Java
Java 8
Java Stream
:: (double colon) operator in Java 8
Java
Java 8
Difference between CompletableFuture, Future and RxJava's Observable
Java
Multithreading
Asynchronous
Java 8
Rx Java
Why are Java Streams once-off?
Java
Java 8
Java Stream
Api Design
Java 8 List<V> into Map<K, V>
Java
Lambda
Java 8
Java Stream
WebService Client Generation Error with JDK8
Webservice Client
Java 8
Netbeans 8
PermGen elimination in JDK 8
Java
Java 8
Jvm
Permgen
How to use a Java8 lambda to sort a stream in reverse order?
Java
Lambda
Java 8
Java Stream
What does the arrow operator, '->', do in Java?
Java
Intellij Idea
Apache Commons
Java 8
Apache Commons-Collection
Java 8 - Best way to transform a list: map or foreach?
Java
Java 8
Java Stream
Why is String.chars() a stream of ints in Java 8?
Java
String
Java 8
Java "lambda expressions not supported at this language level"
Java
Intellij Idea
Lambda
Java 8
How can I count occurrences with groupBy?
Java
Functional Programming
Java 8
How to convert a Java 8 Stream to an Array?
Java
Arrays
Java 8
Java Stream
Filter values only if not null using lambda in Java8
Java
Lambda
Nullpointerexception
Null
Java 8
Java 8 stream's .min() and .max(): why does this compile?
Java
Java 8
Java Stream
What is the reason why “synchronized” is not allowed in Java 8 interface methods?
Java
Java 8
Synchronized
Default Method
Jsr335
Java 8: How do I work with exception throwing methods in streams?
Java
Java 8
Unhandled Exception
Java Stream
Java 8 - Difference between Optional.flatMap and Optional.map
Java
Java 8
Optional
Error:java: javacTask: source release 8 requires target release 1.8
Java
Intellij Idea
Java 8
Does Java SE 8 have Pairs or Tuples?
Java
Lambda
Functional Programming
Java 8
Java Stream
Unable to obtain LocalDateTime from TemporalAccessor when parsing LocalDateTime (Java 8)
Java
Datetime
Java 8
Datetime Format
Does a lambda expression create an object on the heap every time it's executed?
Java
Lambda
Java 8
Limit a stream by a predicate
Java
Java 8
Java Stream
Adding up BigDecimals using Streams
Java
Bigdecimal
Java 8
Java Stream
Java 8 Stream and operation on arrays
Java
Arrays
Java 8
Java Stream
What's the difference between map() and flatMap() methods in Java 8?
Java
Java 8
Java Stream
Java 8 stream reverse order
Java
List
Sorting
Java 8
Java Stream
What Java 8 Stream.collect equivalents are available in the standard Kotlin library?
Java
Kotlin
Collections
Java 8
Java Stream
How to add elements of a Java8 stream into an existing List
Java
Java 8
Java Stream
Collectors
Java 8: Lambda-Streams, Filter by Method with Exception
Java
Exception Handling
Lambda
Java 8
Is it possible to cast a Stream in Java 8?
Java
Java 8
Java Stream
Why is a combiner needed for reduce method that converts type in java 8
Java
Java 8
Java Stream
Java 8 forEach with index
Java
For Loop
Foreach
Java 8
Can a java lambda have more than 1 parameter?
Java
Lambda
Java 8
Move to next item using Java 8 foreach loop in stream
Java
Java 8
What is the difference between ZoneOffset.UTC and ZoneId.of("UTC")?
Java
Datetime
Java 8
Java Time
How to ensure order of processing in java8 streams?
Java
Java 8
Java Stream
What's the difference between ZonedDateTime and OffsetDateTime?
Java
Java 8
Java Time
In Java streams is peek really only for debugging?
Java
Java 8
Java Stream
Peek
Intellij - Unable to use newer Java 8 classes - Error : "Usage of API documented as @since 1.6+.."
Intellij Idea
Java 8
In Java, what are the advantages of streams over loops?
Java
Loops
Java 8
Java Stream
Should I return a Collection or a Stream?
Java
Collections
Java 8
Encapsulation
Java Stream
Can you split a stream into two streams?
Java
Java 8
Java Stream
In Java 8 how do I transform a Map<K,V> to another Map<K,V> using a lambda?
Java
Map
Lambda
Java 8
Java Stream
How to specify function types for void (not Void) methods in Java8?
Java
Java 8
Why does array[idx++]+="a" increase idx once in Java 8 but twice in Java 9 and 10?
Java
Java 8
Javac
Java 9
Java 10
What are functional interfaces used for in Java 8?
Java
Lambda
Java 8
Functional Interface
Generic return type upper bound - interface vs. class - surprisingly valid code
Java
Generics
Java 8
Adding two Java 8 streams, or an extra element to a stream
Java
Concat
Java 8
Java Stream
How can I get a List from some class properties with Java 8 Stream?
Java
Collections
Java 8
Java Stream
Modifying local variable from inside lambda
Java
Lambda
Java 8
Class has been compiled by a more recent version of the Java Environment
Java
Eclipse
Selenium
Firefox
Java 8
How to serialize a lambda?
Java
Serialization
Lambda
Java 8
Fetch first element of stream matching the criteria
Java
Java 8
Java Stream
How to convert java.sql.timestamp to LocalDate (java8) java.time?
Java
Timestamp
Java 8
Localtime
Java Time
Can Java 8 code be compiled to run on Java 7 JVM?
Java
Jvm
Compatibility
Java 7
Java 8
Zipping streams using JDK8 with lambda (java.util.stream.Streams.zip)
Lambda
Functional Programming
Java 8
Lazy Evaluation
Java Stream
functional interface that takes nothing and returns nothing
Java
Function
Java 8
How can I turn a List of Lists into a List in Java 8?
Java
Collections
Java 8
LocalDate to java.util.Date and vice versa simplest conversion?
Java
Date
Java 8
Java Time
Java 8 Streams - collect vs reduce
Java
Java 8
Java Stream
Java 8: performance of Streams vs Collections
Java
Performance
Collections
Java 8
Java Stream
CompletableFuture | thenApply vs thenCompose
Java
Java 8
Completable Future
Observer is deprecated in Java 9. What should we use instead of it?
Java
Java 8
Deprecated
Observer Pattern
Java 9
Format a date using the new date time API
Java
Datetime
Java 8
Java Time
How to convert a LocalDate to an Instant?
Java
Datetime
Java 8
Java Time
Built-in Java 8 predicate that always returns true?
Java
Lambda
Java 8
Predicate
Difference between Java 8 streams and RxJava observables
Java 8
Java Stream
Rx Java
Observable
What is a 'SAM type' in Java?
Java
Lambda
Java 8
Terminology
Copy a stream to avoid "stream has already been operated upon or closed"
Java
Lambda
Java 8
Java Stream
Lambda expression vs method reference
Java
Intellij Idea
Lambda
Java 8
Side Effects
Java8: Why is it forbidden to define a default method for a method from java.lang.Object
Java
Interface
Java 8
Default Method
Java 8: Where is TriFunction (and kin) in java.util.function? Or what is the alternative?
Java
Lambda
Java 8
Understanding Spliterator, Collector and Stream in Java 8
Java
Lambda
Java 8
Spliterator
How to tell if JRE or JDK is installed
Java
Macos
Java 8
Format LocalDateTime with Timezone in Java8
Java
Java 8
Java Time
Optional orElse Optional in Java
Java
Lambda
Java 8
Optional
Java 9
How do I use the new computeIfAbsent function?
Java
Dictionary
Lambda
Java 8
CompletableFuture<T> class: join() vs get()
Java
Java 8
Completable Future
How to set IntelliJ IDEA Project SDK
Java
Intellij Idea
Java 8
Sdk
Java 7
Get last element of Stream/List in a one-liner
Java
List
Java 8
Java Stream
Why is Cloneable not deprecated?
Java
Java 8
Deprecated
Cloneable
JSON Java 8 LocalDateTime format in Spring Boot
Java
Json
Java 8
Spring Boot
Java Time
How to work around the stricter Java 8 Javadoc when using Maven
Java
Maven
Java 8
How to check if a Java 8 Stream is empty?
Java
Java 8
Java Stream
How can I create a stream from an array?
Java
Arrays
Java 8
Java Stream
What is the purpose of the default keyword in Java?
Java
Interface
Java 8
Default
How to check if element exists using a lambda expression?
Java
Java 8
Lambda
Is it possible to use Java 8 for Android development?
Java
Android
Java 8
Android Gradle-Plugin
Find first element by predicate
Java
Java 8
Java Stream
Comparator.reversed() does not compile using lambda
Java
Lambda
Java 8
Comparator
Method Reference
Does Java 8 provide a good way to repeat a value or function?
Java
Java 8
How to extract epoch from LocalDate and LocalDateTime?
Java
Time
Java 8
Epoch
Java Time
How to debug stream().map(...) with lambda expressions?
Java
Debugging
Lambda
Java 8
Should I always use a parallel stream when possible?
Java
Parallel Processing
Java 8
Java Stream
When to use: Java 8+ interface default method, vs. abstract method
Java
Interface
Java 8
Abstract Class
Default Method
Java 8 functional interface with no arguments and no return value
Java
Java 8
Java Stream
Is there a Collector that collects to an order-preserving Set?
Java
Java 8
Collectors
'Optional.get()' without 'isPresent()' check
Java
Java 8
Java Stream
Optional
Proper usage of Optional.ifPresent()
Java
Lambda
Java 8
Optional
How to convert ZonedDateTime to Date?
Java
Java 8
java.util.date
Datetime Conversion
Zoneddatetime
What is the difference between static and default methods in a Java interface?
Java
Java 8
Interface
How to convert an Instant to a date format?
Java
Date
Datetime
Java 8
Simpledateformat
How to get UTC+0 date in Java 8?
Java
Datetime
Java 8
Java Time
What is the difference between PermGen and Metaspace?
Java
Java 8
Java 7
Permgen
Metaspace
When and why would you use Java's Supplier and Consumer interfaces?
Java
Java 8
Is there any benefit to upgrading Java 7 compiled code to Java 8?
Java
Performance
Java 8
Java 8 Distinct by property
Java
Collections
Java 8
Java Stream
Distinct Values
Transform Java Future into a CompletableFuture
Java
Java 8
Future
Java 8 Lambda function that throws exception?
Java
Lambda
Java 8
Do lambda expressions have any use other than saving lines of code?
Java
Lambda
Java 8
Java8 Lambdas vs Anonymous classes
Java
Lambda
Java 8
Anonymous Class
Why java.util.Optional is not Serializable, how to serialize the object with such fields
Java
Serialization
Java 8
Optional
What does lambda with 2 arrows mean in Java 8?
Java
Lambda
Java 8
Currying
Converting between java.time.LocalDateTime and java.util.Date
Java
Datetime
Java 8
Java Time
What are "sugar", "desugar" terms in context of Java 8?
Java
Semantics
Java 8
java.util.Objects.isNull vs object == null
Java
Java 8
Compare
Group by multiple field names in java 8
Java
Java 8
Java 8 default methods as traits : safe?
Java
Java 8
Traits
Default Method
Convert java.util.Date to java.time.LocalDate
Java
Datetime
Java 8
Java Time
How to convert an Iterator to a Stream?
Java
Iterator
Java 8
Return from lambda forEach() in java
Java
Foreach
Lambda
Java 8
Return Type
Lambda Expression and generic defined only in method
Java
Generics
Lambda
Java 8
Why should Java 8's Optional not be used in arguments
Java
Java 8
Optional
Java 8 Stream with batch processing
Java
Java 8
Batch Processing
Java Stream
How to convert LocalDate to SQL Date Java?
Java
Java 8
Converter
Java Time
Sqldatetime
Java 8 lambda get and remove element from list
Java
Lambda
Java 8
Java Stream
Collect successive pairs from a stream
Java
Java 8
Java Stream
Why in Java 8 split sometimes removes empty strings at start of result array?
Java
Regex
Split
Java 8
Lambda expression to convert array/List of String to array/List of Integers
Java
Arrays
Collections
Lambda
Java 8
Java ternary operator vs if/else in <JDK8 compatibility
Java
Java 8
Ternary Operator
Convert LocalDateTime to LocalDateTime in UTC
Java
Java 8
Utc
Java Time
How to find maximum value from a Integer using stream in Java 8?
Java 8
Java Stream
Why does findFirst() throw a NullPointerException if the first element it finds is null?
Java
Java 8
Java Stream
Optional
Is there any way to convert ZoneId to ZoneOffset in Java 8?
Java
Java 8
Java Time
Zoneddatetime
java.time.instant
How to get default ZoneOffset in java8?
Java
Java 8
Timezone
Timezone Offset
When should I use streams?
Java
Java 8
Java Stream
What is the difference between putIfAbsent and computeIfAbsent in Java 8 Map ?
Java
Java 8
Horrendous performance & large heap footprint of Java 8 constructor reference?
Java
Constructor
Java 8
Out of-Memory
Method Reference
Difference between findAny() and findFirst() in Java 8
Java
Java 8
Java Stream
HashMap Java 8 implementation
Java
Dictionary
Java 8
Hashmap
Reverse a comparator in Java 8
Java
Sorting
Java 8
Comparator
Java Stream
Java 8 Iterable.forEach() vs foreach loop
Java
For Loop
Java 8
Java Stream
Using streams to collect into TreeSet with custom comparator
Java
Collections
Java 8
Mocking time in Java 8's java.time API
Java
Datetime
Mocking
Java 8
Java Time
Java 8, Streams to find the duplicate elements
Java
Lambda
Java 8
Java Stream
Why can't I map integers to strings when streaming from an array?
Java
Functional Programming
Java 8
Java Stream
Why does Collections.sort use Mergesort but Arrays.sort does not?
Java
Arrays
Sorting
Collections
Java 8
Java 8: preferred way to count iterations of a lambda?
Java
Lambda
Java 8
Java Stream
Default garbage collector for Java 8
Java
Garbage Collection
Java 8
Multiple null checks in Java 8
Java
Lambda
Java 8
Java Stream
Optional
_ (underscore) is a reserved keyword
Java
Lambda
Java 8
How many threads are spawned in parallelStream in Java 8?
Java
Multithreading
Java 8
java.util.concurrent
forEach vs forEachOrdered in Java 8 Stream
Java
Foreach
Java 8
Java Stream
Check instanceof in stream
Java
Java 8
Java Stream
Instanceof
Java 8: Calculate difference between two ZonedDateTime
Java
Date
Datetime
Java 8
Timezone
In Java 8, why is the default capacity of ArrayList now zero?
Java
Arraylist
Java 8
How do I keep the iteration order of a List when using Collections.toMap() on a stream?
Java
Collections
Java 8
Java Stream
How to execute logic on Optional if not present?
Java
Java 8
Optional
Registry key Error: Java version has value '1.8', but '1.7' is required
Java
Java 8
Sencha Touch
Sencha Touch-2
Sencha Cmd
Convert Iterable to Stream using Java 8 JDK
Java
Java 8
Java Stream
Iterable
Retrieving a List from a java.util.stream.Stream in Java 8
Java
Lambda
Collections
Java 8
Java Stream
Why does Stream.allMatch() return true for an empty stream?
Java
Lambda
Java 8
Java Stream
Java 8 Stream API to find Unique Object matching a property value
Java
Filter
Java 8
Java Stream
How should we manage jdk8 stream for null values
Java
Null
Java 8
Java Stream
What is the "default" implementation of method defined in an Interface?
Java
Interface
Java 8
Sum values from specific field of the objects in a list
Java
Filter
Java 8
Java Stream
Java8 java.util.Date conversion to java.time.ZonedDateTime
Java
Date
Datetime
Java 8
Java Time
Remove duplicates from a list of objects based on property in Java 8
Java
List
Java 8
Collectors.toSet() and HashSet
Java
Java 8
Java Stream
Collectors
Is there a concise way to iterate over a stream with indices in Java 8?
Java
Java 8
Java Stream
When is an interface with a default method initialized?
Java
Interface
Java 8
Default Method
How to map values in a map in Java 8?
Java
Map
Lambda
Java 8
Java 8 Supplier with arguments in the constructor
Java
Lambda
Functional Programming
Java 8
Functional Interface
Is it possible to use the Java 8 Stream API on Android API < 24?
Java
Android
Java 8
Java Stream
Java 1.8 ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet
Java
Spring
Java 8
Very confused by Java 8 Comparator type inference
Java
Sorting
Lambda
Java 8
Comparator
Modifying Objects within stream in Java8 while iterating
Java
Java 8
Java Stream
How to install openjdk-8-jdk on Debian 10 (Buster)?
Java
Java 8
Debian
How to decompile to java files intellij idea
Java
Intellij Idea
Java 8
Decompiling
Java 8 Lambda Expressions - what about multiple methods in nested class
Java
Lambda
Java 8
Anonymous Class
Merge lists with stream API
Java
List
Java 8
Java Stream
Adding new value to existing Stream
Java
Java 8
Wildcard
Which free version of Java can I use for production environments and or commercial purposes?
Java
Java 8
Azul Zulu
Corretto
Custom thread pool in Java 8 parallel stream
Java
Concurrency
Parallel Processing
Java 8
Java Stream
Error:could not create the Java Virtual Machine Error:A fatal exception has occured.Program will exit
Java
Java 8
Java stream toArray() convert to a specific type of array
Java
Arrays
Java 8
Java Stream
How to get the MethodInfo of a Java 8 method reference?
Java
Reflection
Lambda
Java 8
How to sum a list of integers with java streams?
Java
Java 8
Java Stream
null-safe mapping Comparator using default implementations
Java
Java 8
Comparator
forEach loop Java 8 for Map entry set
Java
Lambda
Java 8
Using JavaFX in JRE 8, “Access restriction” error
Java
Eclipse
Javafx
Java 8
JDK8 - Error "class file for javax.interceptor.InterceptorBinding not found" when trying to generate javadoc using Maven javadoc plugin
Java
Maven
Java 8
Maven Javadoc-Plugin
Java 8 Streams FlatMap method example
Java
Java 8
Java Stream
Flatmap
org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 15
Java
Eclipse
Tomcat
Java 8
Classformatexception
Difference between year-of-era and week-based-year?
Java
Date
Datetime
Java 8
Java Time
Get enum values as List of String in Java 8
Java
Enums
Java 8
A peculiar feature of exception type inference in Java 8
Java
Generics
Java 8
Type Inference
Why does parallel stream with lambda in static initializer cause a deadlock?
Java
Java 8
Deadlock
Java Stream
Fork Join
Java 8: Formatting lambda with newlines and indentation
Java
Eclipse
Lambda
Java 8
Java Stream
How to use the unsigned Integer in Java 8 and Java 9?
Java
Java 8
Unsigned
How do I define a method which takes a lambda as a parameter in Java 8?
Java
Lambda
Java 8
Are defaults in JDK 8 a form of multiple inheritance in Java?
Java
Interface
Closures
Multiple Inheritance
Java 8
Is there a way to compare lambdas?
Java
Lambda
Java 8
Java 8 Filter Array Using Lambda
Java
Lambda
Java 8
Is there an equivalent of Scala's Either in Java 8?
Java
Scala
Java 8
How can I collect a Java 8 stream into a Guava ImmutableCollection?
Java 8
Guava
Java Stream
Why does this Java 8 lambda fail to compile?
Java
Lambda
Compiler Errors
Java 8
Void
Monads with Java 8
Java
Java 8
Monads
Optional
Collectors.toMap() keyMapper -- more succinct expression?
Java
Collections
Lambda
Java 8
Java Stream
How to get a range of items from stream using Java 8 lambda?
Java
Filter
Lambda
Java 8
Chaining Optionals in Java 8
Java
Lambda
Java 8
Optional
How do I turn a Java Enumeration into a Stream?
Java
Java 8
Java Stream
How to concatenate a string with the new 1.8 stream API
Java
Java 8
Java Stream
How to parse/format dates with LocalDateTime? (Java 8)
Java
Datetime
Java 8
Timestamp
Java Time
What's the difference between Instant and LocalDateTime?
Java
Datetime
Java 8
Jsr310
How to negate a method reference predicate
Java
Predicate
Java 8
Negate
Is there a method reference for a no-op (NOP) that can be used for anything lambda?
Java
Lambda
Functional Programming
Java 8
Maximum size of a method in Java 7 and 8
Java
Java 7
Java 8
Can an interface method have a body?
Java
Interface
Java 8
Default Implementation
What is the difference between year and year-of-era?
Java 8
Java Time
long timestamp to LocalDateTime
Java
Java 8
Timestamp
Java Time
Convert java.time.LocalDate into java.util.Date type
Java
Java 8
Java Time
Is method reference caching a good idea in Java 8?
Java
Caching
Java 8
Method Reference
Tomcat 8 Maven Plugin for Java 8
Tomcat
Java 8
Maven Tomcat-Plugin
Tomcat8
LocalDateTime remove the milliseconds
Java
Database
Date
Java 8
How can I mock java.time.LocalDate.now()
Java
Java 8
Java Time
Systemtime
How to convert from Instant to LocalDate
Java 8
Localdate
java.time.instant
Java Time
Why can't I get a duration in minutes or hours in java.time?
Java
Java 8
Java Time
How to compare LocalDate instances Java 8
Date
Compare
Java 8
Java 8 Collectors.toMap SortedMap
Java
Lambda
Java 8
Java Stream
Collectors
Java 8 CompletableFuture.allOf(...) with Collection or List
Java
Java 8
Completable Future
Lambdas: local variables need final, instance variables don't
Java
Lambda
Java 8
Final
String Deduplication feature of Java 8
Java
String
Java 8
Why filter() after flatMap() is "not completely" lazy in Java streams?
Java
Lambda
Java 8
Java Stream
Precise definition of "functional interface" in Java 8
Java
Lambda
Java 8
Abstract
Functional Interface
What kind of List<E> does Collectors.toList() return?
Java
List
Lambda
Java 8
Collectors
Iterate an Enumeration in Java 8
Java
Lambda
Iteration
Enumeration
Java 8
Java 8 method reference unhandled exception
Java
Lambda
Java 8
Most efficient way to get the last element of a stream
Java
Java 8
Java Stream
Get date of first day of week based on LocalDate.now() in Java 8
Java
Java 8
Java 8: How to create a ZonedDateTime from an Epoch value?
Java
Java 8
Epoch
Zoneddatetime
Java 8 date-time: get start of day from ZonedDateTime
Java
Datetime
Java 8
Java Time
Why does \R behave differently in regular expressions between Java 8 and Java 9?
Java
Regex
Unicode
Java 8
Java 9
Why does this Java 8 program not compile?
Java
Generics
Type Inference
Java 8
Java8 Lambdas and Exceptions
Java
Lambda
Java 8
Throwing exception from CompletableFuture
Java
Exception
Exception Handling
Java 8
Completable Future
Why is StringBuilder#append(int) faster in Java 7 than in Java 8?
Java
Performance
Java 7
Java 8
Jmh
Unit testing a class with a Java 8 Clock
Java
Unit Testing
Java 8
Java Time
Recursive ConcurrentHashMap.computeIfAbsent() call never terminates. Bug or "feature"?
Java
Recursion
Java 8
Concurrenthashmap
Why does the new Java 8 Date Time API not have nanosecond precision?
Java
Java 8
Java Time
How to convert an Optional<T> into a Stream<T>?
Java
Java 8
Java Stream
Optional
Stream Way to get index of first element matching boolean
Java
Java 8
Java Stream
Lambda this reference in java
Java
Lambda
Java 8
Is mapToDouble() really necessary for summing a List<Double> with Java 8 streams?
Java
Java 8
Java Stream
What does the -> <- operator do?
Java
Syntax
Lambda
Obfuscation
Java 8
Why StringJoiner when we already have StringBuilder?
Java
String
Java 8
Stringbuilder
Optional vs. null. What is the purpose of Optional in Java 8?
Java
Java 8
Stream.peek() method in Java 8 vs Java 9
Java
Lambda
Java 8
Java 9
Peek
Break or return from Java 8 stream forEach?
Java
Foreach
Lambda
Java 8
How to get milliseconds from LocalDateTime in Java 8
Java
Datetime
Java 8
Milliseconds
Java Time
Can I duplicate a Stream in Java 8?
Java
Java 8
Java Stream
Java 8 pass method as parameter
Java
Lambda
Java 8
Method Reference
Java 8: sort list of objects by attribute without custom comparator
List
Sorting
Lambda
Java 8
Android Studio Error: Error:CreateProcess error=216, This version of %1 is not compatible with the version of Windows you're running
Java
Android
Android Studio
Java 8
Android Studio-2.2
Throw an exception if an Optional<> is present
Java
Java 8
Convert between LocalDate and sql.Date
Java
Date
Java 8
Java Time
Converters
Can Java 8 Streams operate on an item in a collection, and then remove it?
Java
Collections
Java 8
Filtering
Java Stream
Difference between final and effectively final
Java
Lambda
Inner Classes
Final
Java 8
No IDEA annotations attached to the JDK 1.8 (C:\...), some issues will not be found
Java
Android Studio
Java 8
Android Studio-3.1
How to create an infinite stream with Java 8
Java
Java 8
Is there an elegant way to process a stream in chunks?
Java
Java 8
Java Stream
Chunking
Java Lambda Stream Distinct() on arbitrary key?
Java
Lambda
Java 8
Why are Java 8 lambdas invoked using invokedynamic?
Java
Lambda
Jvm
Java 8
Bytecode
Lambda that does absolutely nothing
Java
Lambda
Java 8
Runnable
UnsupportedOperationException - Why can't you call toInstant() on a java.sql.Date?
Java
Java 8
Java Time
Collection to stream to a new collection
Java
Java 8
Java Stream
Is there a class in java.time comparable to the Joda-Time Interval?
Java 8
Jodatime
Java Time
DateTimeFormatter Support for Single Digit Day of Month and Month of Year
Java
Date
Java 8
Java Time
Why is Arrays.fill() not used in HashMap.clear() anymore?
Java
Arrays
Hashmap
Java 8
How to compare equality of lists of arrays with modern Java?
Java
Arrays
List
Java 8
Equals
Modify property value of the objects in list using Java 8 streams
Java 8
Java Stream
Null safe Collection as Stream in Java 8
Java
Collections
Null
Java 8
Java Stream
Java 8 Boolean.logicalOr method
Java
Java 8
Catching multiple exceptions in Java-8
Java
Exception
Java 8
Try Catch
How do I convert a Java 8 IntStream to a List?
Java
Java 8
Java 8: Mandatory checked exceptions handling in lambda expressions. Why mandatory, not optional?
Java
Lambda
Checked Exceptions
Java 8
Splitting List into sublists along elements
Java
List
Java 8
Collectors
Moving from JDK 1.7 to JDK 1.8 on Ubuntu
Java
Linux
Ubuntu
Java 8
Why is "final" not allowed in Java 8 interface methods?
Java
Language Design
Java 8
Default Method
Jsr335
Unable to install java8 with homebrew
Java
Macos
Java 8
Homebrew
Implement recursive lambda function using Java 8
Java
Recursion
Lambda
Java 8
Hashmap with Streams in Java 8 Streams to collect value of Map
Java
Hashmap
Java 8
Collectors
Partition a Java 8 Stream
Java
Functional Programming
Java 8
Java Stream
Default method returns true for a while, and then returns false? (Possible JVM bug)
Java
Inheritance
Interface
Java 8
What are the differences between abstract classes and interfaces in Java 8?
Java
Interface
Abstract Class
Java 8
Diamond Problem
Java 8's streams: why parallel stream is slower?
Java
Performance
Parallel Processing
Java 8
Java Stream
Why are class static methods inherited but not interface static methods?
Java
Inheritance
Java 8
Interface
Static Methods
Word frequency count Java 8
Java
Java 8
Java Stream
Word Count
Java 8: Difference between two LocalDateTime in multiple units
Java
Date
Datetime
Java 8
Difference
Java 8 stream map to list of keys sorted by values
Java
Collections
Lambda
Java 8
Java Stream
Java 8 Stream Collecting Set
Java
Java 8
Java Stream
Java 8 Stream: difference between limit() and skip()
Java
Java 8
Limit
Java Stream
Skip
Trouble using ScrollableResults-backed Stream as return type in Spring MVC
Java
Hibernate
Java 8
Spring Orm
Open Session-in-View
Want to create a stream of characters from char array in java
Java
Java 8
Java Stream
How to use if-else logic in Java 8 stream forEach
Java
Java 8
Java Stream
Understanding deeply spliterator characteristics
Java
Java 8
Java Stream
Spliterator
Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.code.TypeTags when using lombok
Maven
Java 8
Maven Plugin
Lombok
Why should one use Objects.requireNonNull()?
Java
Java 8
Nullpointerexception
How to calculate the number of days in a period?
Java
Java 8
How to use Java 8 Optionals, performing an action if all three are present?
Java
Java 8
Optional
"Why Apache Harmony" or "How to use Java 8 on Android"
Java
Android
Apache
Java 8
Collectors.groupingBy doesn't accept null keys
Java
Hashmap
Java 8
Java Stream
Collectors
Implementing two interfaces with two default methods of the same signature in Java 8
Java
Interface
Java 8
Merging two Map<String, Integer> with Java 8 Stream API
Java
Merge
Java 8
Java Stream
What is the use of MetaSpace in Java 8?
Java
Garbage Collection
Java 8
Calculate days between two Dates in Java 8
Java
Java 8
Java Time
Days
Date Difference
How can I throw CHECKED exceptions from inside Java 8 streams?
Java
Lambda
Java 8
Java Stream
Checked Exceptions
Ignore duplicates when producing map using streams
Java
Java 8
Java Stream
How to use JDK without JRE in Java 11
Java
Java 8
Migration
Java 11
Why does String.replaceAll() work differently in Java 8 from Java 9?
Java
Regex
String
Java 8
Java 9
Should Java 8 getters return optional type?
Java
Java 8
Nullable
Optional
Using Jackson ObjectMapper with Java 8 Optional values
Java
Jackson
Java 8
Why is Files.lines (and similar Streams) not automatically closed?
Java
Stream
Java 8
Java Stream
Resource Leak
Java 8 LocalDate - How do I get all dates between two dates?
Java
Date
Java 8
Java Time
Runnable::new vs new Runnable()
Java
Java 8
Runnable
Constructor Reference
Maven is not working in Java 8 when Javadoc tags are incomplete
Java
Maven
Migration
Java 8
Javadoc
Uses for Optional
Java
Java 8
Optional
Should I use Java8/Guava Optional for every method that may return null?
Java
Guava
Optional
Java 8
Android Studio - supplied javaHome is not a valid folder
Java
Android Studio
Java 8
Sorting by property in Java 8 stream
Java
Sorting
Lambda
Java 8
Java Stream
Iterator versus Stream of Java 8
Java
Java 8
Domain Driven-Design
Java Stream
Domain Model
Why do Consumers accept lambdas with statement bodies but not expression bodies?
Java
Lambda
Java 8
Type Inference
Functional style of Java 8's Optional.ifPresent and if-not-Present?
Java
Functional Programming
Java 8
Optional
Get value from one Optional or another
Java
Java 8
Optional
Jackson deserialize ISO8601 formatted date-time into Java8 Instant
Java
Json
Datetime
Jackson
Java 8
Why does the Duration class not have 'toSeconds()' method?
Java
Java 8
Api Design
Java Time
How to set format of string for java.time.Instant using objectMapper?
Java
Java 8
Jackson
Java Time
Objectmapper
Java Casting: Java 11 throws LambdaConversionException while 1.8 does not
Java
Eclipse
Java 8
Java 11
Vaadin Flow
installing JDK8 on Windows XP - advapi32.dll error
Java
Dll
Java 8
Windows Xp
Convert between LocalDate and XMLGregorianCalendar
Java
Java 8
Converter
Java Time
A better approach to handling exceptions in a functional way
Java
Java 8
Java Stream
Java 8 apply function to all elements of Stream without breaking stream chain
Java
Java 8
Java Stream
Chaining
Why can't we call Thread#sleep() directly inside a Lambda function?
Java
Multithreading
Lambda
Java 8
Default interface methods are only supported starting with Android 7.0 (Nougat)
Android
Java 8
Kotlin
Annotating the functional interface of a Lambda Expression
Java
Lambda
Annotations
Java 8
Unable to obtain ZonedDateTime from TemporalAccessor using DateTimeFormatter and ZonedDateTime in Java 8
Java
Timezone
Java 8
Datetime Format
Java Time
How to check if exists any duplicate in Java 8 Streams?
Java
Java 8
Duplicates
Java Stream
Java stream map and collect - order of resulting container
Java
List
Java 8
Java Stream
UnsupportedTemporalTypeException when formatting Instant to String
Java
Datetime
Java 8
Datetime Format
Java Time
Stream Filter of 1 list based on another list
Java
Arraylist
Java 8
Java Stream
Difference in behaviour of the ternary operator on JDK8 and JDK10
Java
Java 8
Javac
Unboxing
Java 10
Java 8 lambdas, Function.identity() or t->t
Java
Lambda
Java 8
Java Stream
How will Java lambda functions be compiled?
Java
Lambda
Java 8
What is the Java equivalent for Enumerable.Select with lambdas in C#?
C#
Java
Java 8
JPA support for Java 8 new date and time API
Java
Jpa
Java 8
Jpa 2.1
Java Time
Performance difference between Java 8 lambdas and anonymous inner classes
Java
Performance
Closures
Java 8
Stream of boolean values, is any true?
Java
Lambda
Parallel Processing
Java 8
Java Stream
Java stream - Sort a List to a HashMap of Lists
Java
Java 8
Hashmap
Java Stream
Java 8 toMap IllegalStateException Duplicate Key
Java
Java 8
Java Stream
Collectors
Java 8 Lambda Stream forEach with multiple statements
Java
Lambda
Java 8
Take every nth element from a Java 8 stream
Java
Java 8
Java Stream