yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

class ListWithTrash <T>(
   private val innerList: MutableList<T> = ArrayList<T>()
) : MutableCollection<T> by innerList {
   var deletedItem : T? = null
   override fun remove(element: T): Boolean {
       deletedItem = element
       return innerList.remove(element)

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->
    
Optional<String> opt = Optional.of("Java 8");
if (opt.isPresent()){ //true
   //...
}
 
opt = Optional.ofNullable(null);
if (opt.isEmpty()){ //true

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

import static java.util.Comparator.comparing;

comparing(Person::getFirstname).thenComparing(Person::getSurname);

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

List<person> list = Arrays.asList(personArray);
Stream<Person> stream1 = list.stream();

//or
Stream<Person> stream2 = Stream.of(personArray);

//or

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 →

LocalDate now = LocalDate.now();

LocalDate androidBeta = LocalDate.of(2020, 6, 10);

Period period = Period.between(androidBeta, now);

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

ZoneOffset zoneOffSet= ZoneOffset.of("+03:00");
OffsetDateTime offsetDateTime = OffsetDateTime.now(zoneOffSet);
System.out.println(offsetDateTime);
//2020-06-08T23:50:17.315+03:00

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 →

ZonedDateTime currentDate = ZonedDateTime.now(); 
System.out.println("the current zone is "+ currentDate.getZone());
//the current zone is America/Los_Angeles

ZoneId anotherZone = ZoneId.of(“Europe/Istanbul”); 
ZonedDateTime currentDateInIstanbul = currentZone.withZoneSameInstant(anotherZone);
//2020-06-08T23:50:00.159+03:00[Europe/Istanbul] 

yenerm

// Current date 
LocalDate date = LocalDate.now(); 

// Current time 
LocalTime time = LocalTime.now(); 

// Date of Android 11 beta launch
LocalDate date2 = LocalDate.of(2020, 6, 10); //yyyy,MM,dd

yenerm

<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->

android {
  defaultConfig {
    //Only required when setting minSdkVersion to 20 or lower
    multiDexEnabled true
  }

  compileOptions {

yenerm

fun <T> printType(classType: Class<T>) {
    print(classType::class.java)
}