1.Functional Interface(customized consumer, predicate)

2.default methods

3.static methods

4.Lambdas

5.Method references

6.optional

7.Data and time

8.completable feature

9.metaspace

10.stream api(intermediate stream, terminated stream)

11.collectors class methods

12.comparator(adding default and static methods)

1. Module System

2. Jshell

3. interface changes: added private methods

4. stream API improvements

   drop while takeWhile ofNullable iterate

5. Optional class API improvements

   ifPresentOrElse or stream

6. collector class API improvements

   flat mapping filtering

7. String class API improvements

chars codePoints

8. Try-With-Resources Improvement

1. Local-Variable Type Inference

   example:

    var list = new ArrayList<String>(); // infers ArrayList<String>
    var stream = list.stream();         // infers Stream<String>
   

2.toUnmodifiableList example:

List<String> strings = toUnmodifiableList
.stream()
.collect(Collectors.toUnmodifiableList());

3.tounmodifiableSet

Set<String> unmodifiableSet = Stream.of("item1", "item2", "item3")
.collect(Collectors.toUnmodifiableSet());
unmodifiableSet.add("item4");

4. toUnmodifiableMap

   Map<Integer, String> unmodifiableMap = Stream.of("item1", "item2", "item3", "it") .collect(Collectors.toUnmodifiableMap( String::length, // Key mapper s -> s, // Value mapper (existing, replacement) -> existing + ", " + replacement // Merger function ));

5. orElseThrow

   Optional optional = Optional.ofNullable(getValue()); String value = optional.orElseThrow(() -> new IllegalArgumentException("Value must be present"));